SERVICE MANUALNo part of this manual may be reproduced, translated, distributed, or transmitted in...

© 2009-1 PRINTED IN JAPAN

B51-8281-00 (N) 1219

144MHz FM TRANSCEIVER

TH-K20A/K20ESERVICE MANUAL

This product uses Lead Free solder.This product complies with the RoHS directive for the European market.

© 2011-11 PRINTED IN JAPAN

B51-8997-00 (Y) 203

CONTENTS

DISASSEMBLY FOR REPAIR .....................2

CLONE MODE .............................................3

CIRCUIT DESCRIPTION .............................4

SEMICONDUCTOR DATA ...........................7

COMPONENTS DESCRIPTION ..................9

PARTS LIST ...............................................10

EXPLODED VIEW ......................................16

PACKING ...................................................17

ADJUSTMENT ...........................................18

PC BOARD

TX-RX UNIT (X57-821X-XX) ...................22

SCHEMATIC DIAGRAM ............................26

BLOCK DIAGRAM .....................................30

LEVEL DIAGRAM ......................................32

OPTIONAL ACCESSORIES

BT-16 (Battery Case) .............................33

EMC-11 (Clip Microphone with Earphone) ..33

PB-46L (Li-ion Battery Pack) ................33

KVC-22 (DC Vehicular Chager Adapter) ..33

SPECIFICATIONS ......................................35

Helical antenna

M: (T90-1018-35)

K,E: (T90-1044-15)

Plastic cabinet assy

(A02-4158-03)

Knob (Volume)

(K29-9503-03)

Knob(Encoder)

(K29-9504-03)

Key top (16 keys)

(K29-9502-02)

When performing the TH-K20 adjustment, a personal

computer, programming interface and tuning software are

required.

TH-K20A/K20E

2

Document Copyrights

Copyright 2011 by JVC KENWOOD Corporation. All

rights reserved.

No part of this manual may be reproduced, translated,

distributed, or transmitted in any form or by any means,

electronic, mechanical, photocopying, recording, or other-

wise, for any purpose without the prior written permission of

JVC KENWOOD Corporation.

Disclaimer

While every precaution has been taken in the preparation

of this manual, JVC KENWOOD Corporation assumes no

responsibility for errors or omissions. Neither is any liability

assumed for damages resulting from the use of the informa-

tion contained herein. JVC KENWOOD Corporation reserves

the right to make changes to any products herein at any time

for improvement purposes.

DISASSEMBLY FOR REPAIR

1. Separating the Case Assembly from the

Chassis

1. Remove the two knobs (a).

2. Remove the two screws (b).

3. Pull off the cap from SP/MIC jack (c).

4. Expand the right and left sides of the bottom of the case

assembly, Iift the chassis, and remove it from the case

assembly (d).

5. Taking care not to cut the speaker lead wire with connec-

tor (e), open the chassis and case assembly.

b

b

a

a

c

d

2. Removing the TX-RX unit from the

Chassis

1. Remove the packing (f).

2. Remove the 13 screws (g).

3. Remove the packing (h) and two hexagon nuts (i).

4. Remove the solder from the antenna terminal using a

soldering iron then lift the unit off (j).

Note: When reassembling the unit in the chassis, be sure to

solder the antenna terminal.

e RedBlack

TH-K20A/K20E

3

3. Removing the Rear Panel

1. Raise the rear panel on the chassis (k).

k

CLONE MODE

Programming data can be transferred from one trans-

ceiver to another by connecting them via their SP/MIC con-

nectors.

Cloning can copy the transceiver data to another trans-

ceiver even without the use of a personal computer.

The following data cannot be cloned.

• Tuning data

1. Connect the cloning cable (part No. E30-3410-05) to the

SP/MIC connectors on the source and target transceiv-

ers.

2. Turn the source and target transceiver power OFF.

3. Turn the source transceiver power ON while pressing the

[CALL] keys, to enter clone mode. ”CLONE” appears on

the display.

4. Turn the target transceiver power ON.

5. Press the [CALL] key on the source transceiver while

”SEND” is displayed.

The data of the source is sent to the target.

While the target is receiving data, ”RECV” appears on the

display.

When cloning is completed, the ”END” appears on the

source and target display.

6. Turn the source and target transceiver power OFF.

Note:• The Model name and Market codes must be the same in

order to clone the transceiver.

• If a data transfer error occurs during Clone mode, ”ER-

ROR” appears on the target transceiver.

When you turn the target transceiver power ON again

while ”ERROR” is displayed, the target transceiver

performs a full reset. At this time, the source transceiver

continues to send data.

DISASSEMBLY FOR REPAIR

Antenna terminal

f

g

h

i

j

i

Cloning cable(E30-3410-05)

TH-K20A/K20E

4

1. Frequency Confi guration

The receiver utilizes double conversion. The first IF is

38.85MHz and the second IF is 450kHz. The fi rst Local os-

cillator is supplied from the PLL circuit.

The PLL circuit in the transmitter generates the neces-

sary frequencies.

Fig. 1 Frequency confi guration

Fig. 2 Receiver system

2. Receiver System

The receiver system is shown in Figure 2.

2-1. RF Amplifi er CircuitThe signal coming from the antenna passes through

the transmit/receive switching diode circuit (D101,

D102,D103,D104 and D105) and a BPF (L213,L214), and is

then amplifi ed by the RF amplifi er (Q204).

The resulting signal passes through a BPF (L209,L211

and L217) and goes to the mixer. These BPFs are adjusted

by variable capacitors (D200,D201 and D204). The input

voltage to the variable capacitor is a regulated voltage out-

put from the DAC (IC300).

2-2. First MixerThe signal from the front end is mixed with the fi rst local

oscillator signal generated in the PLL circuit by Q203 to pro-

duce a fi rst IF frequency of 38.85 MHz.

The resulting signal passes through the XF200 MCF to

cut the adjacent spurious and provide the optimum charac-

teristics, such as adjacent frequency selectivity.

RX: 136~173.995MHz(K,E,M)

174.85~212.845MHz

1st MIX MCF SP

MIC

CF450kHz

ANT

ANTSW

RFAMP

IFSYSTEM

X2doubler

PLLVCO

38.85MHz 38.4MHz

TXAMP

T/RSW

AFAMP

MICAMP

AFfilter

TCXO 19.2MHz

RFAMP

TX: 136~173.995MHz(M) 144~147.995MHz(K) 144~145.995MHz(E)

1st Lo:

TX: 136~173.995MHz(M) 144~147.995MHz(K) 144~145.995MHz(E)

SP

ANT

IC200IF,MIX,DET

Q2031st MIX

IC303

CF200

ANTSW

Q201 doubler

2nd Local

X1TCXO

19.2MHz

BPF

BPFQ204

RF AMP XF200

MCF

Q202IF AMP

IC307AF PA

BPF 1st Local

BPF AF filter VR300

CIRCUIT DESCRIPTION

RatingItem

Nominal center frequency (fo)

Pass bandwidth

Attenuation bandwidth

Ultimate attenuation 70dB or more (fo –900 kHz)

Spurious response

1dB or lessRipple

Insertion loss

Terminating impedanc 610 // 3pF

MCF (L71-0669-05) characteristics (TX-RX unit XF200)

Nominal center frequency (fo)

3dB bandwidth

50dB bandwidth

3.0kHz)± of(Ripple

Guaranteed attenuation 50dB or more (fo ±100kHz)

Insertion loss

I/O matching impedance

Ceramic filter (L72-1042-05) characteristics (TX-RX unit CF200)

5dB or less

±11.0kHz or less

38.850MHz

450kHz

6dB or less

1.5k

Item Rating

40dB or more (fo +1MHz)

±25.0kHz or less at 45dB

±5.0kHz or more at 3dB

±4.5kHz or more

2dB or less

TH-K20A/K20E

5

3. Transmitter System

3-1. Microphone Amplifi er CircuitThe signal from microphone amplifi ed by IC301 and goes

through mute switch (IC300).

IC304 is composed of high-pass fi lter, low-pass fi lter and

pre-emphasis/IDC circuit.

The output signal from the DAC IC (IC300) goes to the

VCO modulation input.

Fig. 3 Microphone amplifi er circuit

3-2. Driver and Final Amplifi er CircuitThe signal from the T/R switch (D8 is on) is amplifi ed by

the pre-drive amplifi er (Q101) to 30mW.

The output of the pre-drive amplifi er is amplifi ed by the

drive amplifi er (Q102) and the RF fi nal amplifi er (Q103) to

5.5W (1W when the power is low).

The drive amplifi er and the RF fi nal amplifi er consist of

two MOS FET stages.

The output of the RF final amplifier is then passed

through the harmonic fi lter (LPF) and antenna switch (D101

and D102) and is applied to the antenna terminal.

CIRCUIT DESCRIPTION

X1

TCXO

VCO

LSDO

IC300MIC

DAC

AMP/LIM

IC304

MIC

IC301

MOD

AMPMIC

Q3,D4

ANT

FINAL AMPANTSW

FromT/R SW(D8)

D101,102

+B

POWC

Q102

DRIVE AMP

Q101

VDD

VG

Pre-DRIVE

Q103

R125

R127

R129

CURDET

Fig. 4 Drive and fi nal amplifi er circuit

2-3. IF Amplifi er CircuitThe fi rst IF signal is passed through a four-pole mono-

lithic crystal fi lter (XF200) to remove the adjacent channel

signal.

The fi ltered fi rst IF signal is amplifi ed by the fi rst IF ampli-

fi er (Q202) and then applied to the lF system IC (IC200).

The IF system IC provides a second mixer, second local

oscillator, limiting amplifier, quadrature detector and RSSI

(Received Signal Strength Indicator).The second mixer

mixes the fi rst IF signal with the 38.4MHz of the second lo-

cal oscillator output (TCXO: X1) and produces the second IF

signal of 450kHz.

The second IF signal is passed through the ceramic fi lter

(CF200) to remove the adjacent channel signal. The fi ltered

second IF signal is amplified by the limiting amplifier and

demodulated by the quadrature detector with the ceramic

discriminator (CD200).The demodulated signal is routed to

the audio circuit.

2-4. Audio Amplifi er CircuitThe demodulated signal from IC200 is amplified by

IC303, IC302 and goes to AF amplifi er through IC307.

The signal then goes through a volume control (VR300),

and is routed to an audio power amplifi er (IC307) where it is

amplifi ed and output to the speaker.

To output sounds from the speaker, IC401 sends a high

signal to the SPMUT line and turns IC401 on through Q301,

Q302, Q303, Q305 and Q306.

TH-K20A/K20E

6

CIRCUIT DESCRIPTION

Realign the transceiver after replacing the EEPROM.

6. Signaling Circuit

6-1. Encode

■ CTCSS/ DCSThe CTCSS and DCS signals are output from pin 49

(LSDO) of the MCU (IC401). The signal passes through a

low-pass CR fi lter. The signal is mixed with the audio signal

and goes to the VCO and TCXO (X1) modulation input after

signal processing in the DAC IC (IC300).

■ DTMFThe DTMF signal is output from pin 50 (HSDO) of the

MCU.

The signal passes through a low-pass CR fi lter. TX devia-

tion making an adjustment by MCU is applied to the DAC IC

(IC300). The signal is mixed with the audio signal and goes

to the VCO and TCXO.

6-2. Decode

■ CTCSS/DCSThe output signal from IF IC (IC200) enters the MCU

(IC401) through IC300. IC401 determines whether the

CTCSS or DCS matches the preset value, and controls the

SPMUT and the speaker output sounds according to the

squelch results.

Fig. 6 Encode

7. Power Supply

There are fi ve 5V power supplies for the MCU:

5M is always output while the power is on.

5C is a common 5V and is output when SAVE is not set

to ON.

5R is 5V for reception and output during reception.

5T is 5V for transmission and output during transmission.

5MS is 5V for the SP/MIC connector and the DAC IC

(IC300).

4. Frequency Synthesizer Circuit

4-1. Frequency SynthesizerThe frequency synthesizer consists of the TCXO (X1),

VCO, PLL IC (IC1) and buffer amplifi ers.

The TCXO generates 19.2MHz. The frequency stability is

5.0 ppm within the temperature range of –30 to +60°C.

The frequency tuning and modulation of the TCXO are

done to apply a voltage to pin 1 of the TCXO. The output of

the TCXO is applied to pin 1 of the PLL IC.

The VCO consists of 1VCO and covers a dual range of

the 144.00~174.00MHz and the 182.85~212.85MHz. The

VCO generates 182.85~212.85MHz for providing to the fi rst

local signal in receive.

The PLL IC consists of a prescaler, reference divider,

phase comparator, charge pump (The frequency step of the

PLL circuit is 5 or 6.25 kHz).

PLL data is output from DAT (pin 19), CLK (pin 18) and

PLDL (pin 20) of the MCU (IC401). The data are input to the

PLL IC when the channel is changed or when transmission

is changed to reception and vice versa. A PLL lock condition

is always monitored by the pin 22 (PLUL) of the MCU. When

the PLL is unlocked, the PLUL goes low.

Fig. 5 PLL block diagram

5. Control Circuit

The control consists of the MCU (IC401) and its peripheral

circuits. It controls the TX-RX unit. IC401 mainly performs

the following;

1) Switching between transmission and reception by PTT

signal input.

2) Reading channel information, frequency, and program

data from the memory circuit.

3) Sending frequency program data to the PLL.

4) Controlling squelch on/off via the DC voltage from the

squelch circuit.

5) Controlling the audio mute circuit via the decode data

input.

6) Transmitting tone and encode data.

7) Sending display data to the LCD assembly.

Note:

The EEPROM stores tuning data (Deviation, Squelch,

etc.).

HSDO

LSDO

IC401MCU

IC300DAC

AF POWERAMP

TCXO

3

4

7

8

FREQ

VCO

12

MOD

9

BEEP

6

24

CTCSS/DCS

INV

VCO

PLL

MCU

IC401DAT,CLK,PLLE

IC1

PLLD

8

1

5

14

RF

SWLPF To mixer

LSDO

Q4

BUFF

Q5

TCXO

X1

SWToPre-AMP

SHIFT(TX: Low)

D8

D7

Q6

CV

AMP

Q3

LD

AMPTXRX

TXRX

TH-K20A/K20E

7

SEMICONDUCTOR DATA

MCU: R5F2L3ACCKEKA (TX-RX unit IC401)

Pin No. Port Name I/O Function

1 KEYIT I Type detection

2 KEYIS I Type detection

3 HSDO O DTMF/BEEP/1750Hz tone output

4 LSDO O CTCSS/DCS tone output

5 WKUPO - Ground

6 VREF - Reference voltage input

7 MODE - MCU mode select

8 XCIN - Not used (Pull-up)

9 XCOUT - Not used

10 RESET I MCU reset

11 XOUT O 11.0592MHz MCU clock output

12 VSS - Ground

13 XIN I 11.0592MHz clock input for MCU

14 VCC - 5V power supply (5M)

15 BSFT O Beat shift control

16 INPTT IINT PTT switch input

L: Active

17 5RC O5R RX power switch control

L: Active

18,19 ENC2-ENC1 I Encoder input 2,1

20 RxD I Serial data input from PC

21 TxD O Serial data input to PC

22 W/N OWide/Narrow control

H: Narrow

23 PLLE OPLL-IC enable

H: Active

24 PLPS OPLL-IC save control

L: Save ON

25 PLLD IPLL unlock detect

L: Unlock

26 EXPTT IEXT-PTT input

L: Active

27 LAMP OBacKlight LED control

H: Lights

28 NC O Not used

29 E2PCS OEEPROM chip select

L: Active

30 E2PIN I Data input from EEPROM

31-34 COM0-COM3 OLCD common output

H: Active

35-66 SEG0-SEG31 OLCD segment output

H: Active

67 LEDR OTX LED (Red) control

H: Lights

68 LEDG OBUSY LED (Green) control

H: Lights

69 5VC O5V MIC AMP power switch control

L: Active

70 5MSC O5MS main power switch control

L: Active

71 SPM OSpeaker mute control

L: Mute


72 MONI I[MONI] key switch input

L: Active

73 CLK O Common serial clock output

74 DATA O Common serial data output

75 5CC O5C Common power switch control

L: Active

76 5TC O5T TX power switch control

L: Active

77 VOLCS ODAC-IC chip select

L: Active

78 VDCSW OVoltage discharge control

H: Active

79 CURRENT I TX current detect

80 VOX I VOX level detect

81 REM IRemote control microphone key

detect

82 BATT I Battery voltage detection

83 THERM I Temperture detect

84 RSSI I RSSI level detect

85 SQL I Squelch level detect

86 LSDI I CTCSS/DCS tone detect

87 CVDET I VCO controle voltage detect

88-90KEYO4-

KEYO2O Key matrix output 4-2

91-93 VL1-VL3 - LCD drive power supply

94 SHIFT OVCO TX/RX control

H: TX

95 KEYO1 O Key matrix output 1

96 VL4 - LCD drive power supply

97-100 KEYI1-KEYI4 I Key matrix input 1-4

TH-K20A/K20E

8

FM IC: TA31136FNG (TX-RX unit IC200)


1 OSCIN I 2nd Local oscillator input

2 OSCOUT O 2nd Local oscillator output

3 MIXOUT O MIX output

4 VCC - Power supply (5.0V)

5 IFIN I 2nd IF input and decoupling

6 DEC - 2nd IF input and decoupling

7 FILOUT O INVERTER AMP output

8 FILIN I INVERTER AMP input

9 AFOUT O Demodulate signal output

10 QUAD IPhase shift signal input of FM

demodulator

11 IFOUT O Output terminal of IF AMP

12 RSSI O This terminal outputs DC

13 NOISEDET - level according to input (Not use)

14 NOISEREC - signal level to IF AMP

15 GND - Ground

16 MIXIN I 1st IF signal input

D/A Converter IC: R2A20178NP (TX-RX unit IC300)


1 Vin2 I FROM AF fi lter signal input

2 VDD - Power supply voltage (5.0V)

3 LD I Load enable signal input

4 CLK I Control data input

5 DI I Control clock input

6 Vin3 IFrom MIC AMP and limiter signal

input

7 Vout3 O Load enable signal input

8 Vout4 O Tone deviation adjust

9 Vin4 I Tone signal input

10 Vin5 I Connect to ground

11 Vout5 O VCO assist voltage adjust

12 Vout6 O TCXO frequency adjust


14 VDAREF1 -Reference voltage 1 for DAC

(1.8V)

15 VDAREF2 -Reference voltage 1 for DAC

(5.0V)

16 /RESET I Reset

17 GND - Ground


19 Vout7 O RX BPF tuning adjust

20 Vout8 O TX power adjust


22 Vin1 I From MIC output

23 Vout1 O MIC level contorol and mute

24 Vout2 O RX AF mute control

PLL IC: MB15E03SL-E1 (TX-RX unit IC1)


1 OSCIN IProgrammable reference divider

input

2 OSCOUT O Oscillator output

3 VP -Power supply voltage input for the

charge pump

4 VCC - Power supply voltage (3.0V)

5 DO O Charge pump output

6 GND - Ground

7 XFIN I

Prescaler complementary input

which should be grounded via a

capacitor

8 FIN I Prescaler input

9 ClOCK IClock input for the 19-bit shift reg-

ister

10 DATA ISerial data input using binary

code

11 LE I Load enable signal input

12 PS I

Power saving mode control

This pin must be set at “L” at

Power-ON.

13 ZC IForced high-impedance control

for the charge pump

14 LD/FOUT O Lock detect signal output

15 P O

Phase comparator N-channel

open drain output for an external

charge pump (Not use)

16 R O

Phase comparator CMOS output

for an external charge pump (Not

use)

SEMICONDUCTOR DATA

TH-K20A/K20E

9

COMPONENTS DESCRIPTION

Ref. No. Use/Function Operation/Condition/Compatibility

IC1 PLL system Frequency control

IC200 FM IF system2nd mixer, IF amplifi er, FM

detector

IC300 D/A converterAF mute/MOD level and fre-

quency adjust

IC301 OP AMP1.8V reference voltage/MIC

amolifi er

IC302 OP AMP Detect AF fi lter

IC303 OP AMP CTCSS/DCS fi lter

IC304 OP AMP MIC amolifi er/IDC

IC305Voltage

detector/3.3VMCU reset

IC306Voltage

regulator/5.0V5M/5MS power supply

IC307AF power ampli-

fi erSpeaker output

IC308Voltage

regulator/5.0V5C/5T/5R power supply

IC400 EEPROM Tuning data/Memory data

IC401 MCU

Q1VCO shift control

switch

TX: ON

Q2 Ripple fi lter for VCO power supply

Q3 Oscillator TX/RX VCO

Q4 Buffer amplifi er for VCO output

Q5 RF amplifi er for VCO output

Q6 Logic invert for unlock signal

Q7Power supply

(3.0V) for PLL IC

Q101 Pre drive amplifi er

Q102 Drive amplifi er

Q103 Final amplifi er 5.5W RF power

Q104Voltage dis-

charge switch

for FET bias voltage.

Active ON (VDCSW: H)

Q200Wide/Narrow

switch

for ceramic fi lter selector

Wide: ON (W/L: L)

Q201 Doubler 2nd Lo: 38.4MHz

Q202 1st IF amplifi er 1st IF: 38.85MHz

Q203 1st mixer

Q204 RF amplifi er RX 1st amplifi re

Q300Power supply

(5.0V) switchActive ON (5VC: L)

Q301SP mute control

switchActive ON (SM: H)

Q302SP mute control

switchfor pop-noise Active ON

Q303Speaker mute

switchfor AF signal line Active ON

Ref. No. Use/Function Operation/Condition/Compatibility

Q304Power supply

(5MS) switchActive ON (5MSC: L)

Q305Speaker mute

switchfor AF signal line Active ON

Q306IC power supply

switchfor AF power IC Active ON

Q307Power supply

(5R) switchActive ON (5RC: L)

Q308Power supply

(5T) switchActive ON (5TC: L)

Q400 Beat shift switch Active ON (BSFT: H)

Q401Backlight LED

switchActive ON

Q402Backlight control

switchActive ON (LAMP: H)

Q403 Busy LED switch Active ON (LEDG: H)

Q404 TX LED switch Active ON (LEDR: H)

D1,D2VCO frequency

control

D3 RF switchfor frequency range change

TX: ON

D4 VCO modulation for frequency modulation

D5Assist frequency

control

D6 Speed up for ripple fi lter

D7 RF switch for TX signal TX: ON

D8 RF switch for RX signal

D9, D10 Speed up for ripple fi lter

D11 Speed up for VCO shift control line

D101-104 Antenna switch TX: ON

D200, D201Band-pass fi lter

tuningVHF band for receiver

D203Band-pass fi lter

tuningVHF band for receiver

D300 VOX signal detect

D301Reverse connec-

tion protectionBattry terminal

D302Reverse current

preventionfor IC306 input

D304Reverse current

preventionfor IC308 input

D401Over voltage limit-

ter3.6V zener diode

D404-411Reverse current

preventionKey matrix

D414, D415LCD backlight

LED

D416-425Key backlight

LED

D426 Busy LED Busy: light

D427 TX LED TX: light

TX-RX unit (X57-821X-XX)

TH-K20A/K20E

10

PARTS LIST

Chip capacitor

Code L W T

Empty 5.6±0.5 5.0±0.5 Less than 2.0

A 4.5±0.5 3.2±0.4 Less than 2.0

B 4.5±0.5 2.0±0.3 Less than 2.0

C 4.5±0.5 1.25±0.2 Less than 1.25

D 3.2±0.4 2.5±0.3 Less than 1.5

E 3.2±0.2 1.6±0.2 Less than 1.25

F 2.0±0.3 1.25±0.2 Less than 1.25

G 1.6±0.2 0.8±0.2 Less than 1.0

H 1.0±0.05 0.5±0.05 0.5±0.05

Chip resistor

Code L W T

E 3.2±0.2 1.6±0.2 1.0

F 2.0±0.3 1.25±0.2 1.0

G 1.6±0.2 0.8±0.2 0.5±0.1

H 1.0±0.05 0.5±0.05 0.35±0.05

Code Wattage Code Wattage Code Wattage

1J 1/16W 2C 1/6W 3A 1W

2A 1/10W 2E 1/4W 3D 2W

2B 1/8W 2H 1/2W

Code B C D F G

(pF) ±0.1 ±0.25 ±0.5 ±1 ±2

C C 4 5 T H 1 H 2 2 0 J

1 2 3 4 5 6

1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating

2 = Shape ... round, square, etc. 5 = Value

3 = Temp. coefficient 6 = Tolerance

1st Word C L P R S T U

Color* Black Red Orange Yellow Green Blue Violet

ppm/°C 0 –80 –150 –220 –330 –470 –750

Code C D G J K M X Z P No code

(%) ±0.25 ±0.5 ±2 ±5 ±10 ±20

+40 +80 +100 More than 10µF : –10~+50

–20 –20 –0 Less than 4.7µF : –10~+75

2nd word A B C D E F G H J K V

1st word

0 1.0 1.25 1.6 2.0 2.5 3.15 4.0 5.0 6.3 8.0 –

1 10 12.5 16 20 25 31.5 40 50 63 80 35

2 100 125 160 200 250 315 400 500 630 800 –

3 1000 1250 1600 2000 2500 2150 4000 5000 6300 8000 –

(EX) C C 7 3 F S L 1 H 0 0 0 J Refer to the table above.

1 2 3 4 5 6 7 1 = Type

(Chip) (CH, RH, UJ, SL) 2 = Shape

3 = Dimension

(EX) C K 7 3 F F 1 H 0 0 0 Z 4 = Temp. coefficient

1 2 3 4 5 6 7 5 = Voltage rating

(Chip) (B, F) 6 = Value

7 = Tolerance

(EX) R D 7 3 E B 2 B 0 0 0 J

1 2 3 4 5 6 7

(Chip) (B, F)

(EX) R D 1 4 B B 2 C 0 0 0 J

1 2 3 4 5 6 7

1 = Type 5 = Rating wattage

2 = Shape 6 = Value

3 = Dimension 7 = Tolerance

4 = Temp. coefficient

CC45Color*

2nd Word G H J K L

ppm/°C ±30 ±60 ±120 ±250 ±500

Example : CC45TH = –470±60ppm/°C

010 = 1pF 2 2 0 = 22pF

100 = 10pF

101 = 100pF Multiplier

102 = 1000pF = 0.001µF 2nd number

103 = 0.01µF 1st number

L

W

T

TH-K20A/K20E

� New Parts. indicates safety critical components.

Parts without Parts No. are not supplied.

Les articles non mentionnes dans le Parts No. ne sont pas fournis.

Teile ohne Parts No. werden nicht geliefert.

11

Ref. No. Address Parts No. Description Desti-nation

Newparts Ref. No. Address Parts No. Description Desti-

nationNewparts

M: TH-K20A(M)

K : TH-K20A(K)

E : TH-K20E(E)

PARTS LISTL : Scandinavia K : USA P : Canada

Y : PX (Far East, Hawaii) T : England E : Europe

C : China X : Australia M : Other Areas

TH-K20A/K20E

TX-RX UNIT (X57-821X-XX)

1 1A � A02-4158-03 PLASTIC CABINET ASSY

2 3A � A10-4158-01 CHASSIS

3 3B � A82-0085-02 REAR PANEL

4 3B � B09-0749-03 CAP (EXT SP/MIC)

6 1A � B10-6009-03 FRONT GLASS

7 2B B11-1892-03 ILLUMINATION GUIDE (TX/BUSY)

8 1A � B11-1897-02 ILLUMINATION GUIDE (16KEY)

9 1D � B62-2365-00 INSTRUCTION MANUAL ACCESSORY

11 1D � B62-2369-00 INSTRUCTION MANUAL ACCESSORY K,E

12 1D � B62-2370-00 INSTRUCTION MANUAL ACCESSORY K,E

13 1D � B62-2371-00 INSTRUCTION MANUAL ACCESSORY E




18 1D � B62-2375-00 INSTRUCTION MANUAL ACCESSORY M

19 2B � E04-0488-05 RF COAXIAL RECEPTACLE (SMA)

21 2A � E23-1373-04 TERMINAL

23 1B � E37-1543-05 LEAD WIRE WITH CONNECTOR (SP)

24 2A � E72-0437-03 TERMINAL BLOCK

26 3B G01-4571-04 COIL SPRING

27 2A G11-4437-04 SHEET (Q103-CHASSIS)

29 3B � G13-2366-04 CUSHION (TERMINAL)

31 3A G13-2368-04 CUSHION (BATTERY)

32 2A G53-1867-13 PACKING (CHASSIS)

33 2B � G53-1880-02 PACKING (TOP)

34 2A � G53-1881-04 PACKING (ECM)

36 3B � G53-1882-03 PACKING (SP/MIC)

37 2D � H12-4324-02 PACKING FIXTURE K

38 1C � H12-4326-02 PACKING FIXTURE K

41 3D � H52-2486-02 ITEM CARTON CASE K

42 2C J29-0756-05 BELT CLIP ACCESSORY

46 3A K29-9491-03 LEVER KNOB

47 1A � K29-9502-02 KEY TOP

48 1B � K29-9503-03 KNOB (VOL/PSW)

49 1B � K29-9504-03 KNOB (ENCODER)

51 1A � K29-9505-03 KNOB (PTT)

52 1A � K29-9506-03 BUTTON KNOB (SIDE)

A 2B N09-2438-05 BINDING HEAD SCREW (ANT)

B 3A N80-2608-43 PAN HEAD TAPTITE SCREW

C 1A,2A,2B N83-2005-48 PAN HEAD TAPTITE SCREW (X57)

54 1B T07-0787-05 SPEAKER

56 2C T90-1018-35 HELICAL ANTENNA ACCESSORY M

57 2C T90-1044-15 HELICAL ANTENNA ACCESSORY K,E

58 1C W08-1246-15 AC ADAPTER ACCESSORY M,E

59 1C W08-1247-15 AC ADAPTER ACCESSORY K

61 2D � W08-1249-35 CHARGER ACCESSORY

62 1C W09-1073-25 BATTERY ASSY ACCESSORY

� X57-8210-12 TX-RX UNIT (FOR SERVICE) K

� X57-8210-21 TX-RX UNIT (FOR SERVICE) M

� X57-8212-72 TX-RX UNIT (FOR SERVICE) E

101 3A � B11-1895-03 ILLUMINATION GUIDE (LCD)

102 3A � B11-1896-04 FILTER (LCD)

D414,415 B30-2261-05 LED (YELLOW/LCD)

D416-425 B30-2337-05 LED (YELLOW/KEY))

D426 B30-1782-05 LED (GREEN/BUSY)

D427 B30-1779-05 LED (RED/TX)

103 2A � B38-0939-05 LCD

C1 CK73HB1A184K CHIP C 0.18UF K

C2 CK73HB1C333K CHIP C 0.033UF K


C4 CK73HB1E223K CHIP C 0.022UF K

C5 CC73HCH1H390G CHIP C 39PF G


C7 CC73HCH1H0R5B CHIP C 0.5PF B

C8 CK73HB1H102K CHIP C 1000PF K


C10 CC73HCH1H080B CHIP C 8.0PF B


C12 CS77CP0J010M CHIP TNTL 1.0UF 6.3WV


C15 CC73HCH1H100B CHIP C 10PF B

C16 CS77CA1A220M CHIP TNTL 22UF 10WV




C20 ,21 CK73HB1H102K CHIP C 1000PF K

C22 CC73GCH1H0R5B CHIP C 0.5PF B



C26 CC73HCH1H150J CHIP C 15PF J





C32 ,33 CK73HB1H102K CHIP C 1000PF K



C37 CK73GB1E154K CHIP C 0.15UF K

C38 CS77CA1A6R8M CHIP TNTL 6.8UF 10WV

C39 CS77CA1DR68M CHIP TNTL 0.68UF 20WV










C50 CC73HCH1H050C CHIP C 5.0PF C

C51 CC73GCH1H220J CHIP C 22PF J



TH-K20A/K20E TX-RX UNIT (X57-821X-XX) 0-11: K 0-20: M 2-71: E

TH-K20A/K20E

12


Newparts

PARTS LIST


Newparts

M: TH-K20A(M)

K : TH-K20A(K)

E : TH-K20E(E)


C104,105 CK73HB1H102K CHIP C 1000PF K













C134 CK73GB1H102K CHIP C 1000PF K

C135 CC73GCH1H060B CHIP C 6.0PF B

C136 CK73GB1H102K CHIP C 1000PF K











C151 CK73FB1A225K CHIP C 2.2UF K

C152-157 CK73HB1H102K CHIP C 1000PF K





C200 CK73FB1A106K CHIP C 10UF K






C206,207 CC73HCH1H271J CHIP C 270PF J





C213,214 CK73HB1A104K CHIP C 0.10UF K



















































C318-321 CK73HB1A184K CHIP C 0.18UF K








C329 CK73GB1C225K CHIP C 2.2UF K

C330,331 CC73HCH1H271J CHIP C 270PF J









C340,341 CK73HB1E103K CHIP C 0.010UF K








TH-K20A/K20E

13

PARTS LIST



nationNewparts

M: TH-K20A(M)

K : TH-K20A(K)

E : TH-K20E(E)



C357 C92-0953-05 ELECTRO 100UF 6.3WV
























C404-407 CK73FB0J226M CHIP C 22UF M







C419 C93-1803-05 CHIP C 10UF M



C424,425 CK73HB1E103K CHIP C 0.010UF K



J300 2B E11-0484-05 3.5D PHONE JACK (3.5D/MIC)

J301 2B E11-0717-05 2.5D PHONE JACK (2.5D/SP)

104 3A � E29-1235-04 INTER CONNECTOR (LCD)

CN300 E40-6900-05 PIN ASSY (INT SP)

F101 F53-0287-05 FUSE (0.5A)

F300 F53-0372-05 FUSE (3.15A)

F301 F53-0467-05 FUSE (0.315A)

105 2A � G11-4563-04 SHEET (LCD)

106 2A � J21-8639-03 MOUNTING HARDWARE (LCD)

107 2A J30-1267-04 SPACER (ECM)

CD200 L79-1474-05 TUNING COIL (450KHZ)

CF200 L72-1042-05 CERAMIC FILTER (450KHZ)

L1 L40-2285-92 SMALL FIXED INDUCTOR (220NH)


L3 L40-1001-86 SMALL FIXED INDUCTOR (10UH)








L13 L40-4763-92 SMALL FIXED INDUCTOR (4.7NH)





L106 L34-4577-05 AIR-CORE COIL (9T)


L108 L41-2295-52 SMALL FIXED INDUCTOR (2.2UH)

L109,110 L34-4577-05 AIR-CORE COIL (9T)





L200,201 L40-5681-86 SMALL FIXED INDUCTOR (0.56UH)

L202 L40-8281-86 SMALL FIXED INDUCTOR (0.82UH)








L215 L40-2763-71 SMALL FIXED INDUCTOR (2.7NH)


X1 L77-3074-05 TCXO (19.2 MHZ)

X400 L77-2974-05 CRYSTAL RESONATOR (11.0592MHZ)

XF200 L71-0669-05 MCF (38.85MHZ)

VR300 2B R31-0684-05 VARIABLE RESISTOR (VOL/PSW)

CP1 RK74HB1J102J CHIP-COM 1.0K J 1/16W

R2 RK73HB1J272J CHIP R 2.7K J 1/16W


R4 RK73HB1J153J CHIP R 15K J 1/16W


R6 ,7 RK73HB1J104J CHIP R 100K J 1/16W



R10 RK73HB1J220J CHIP R 22 J 1/16W




R15 RK73GB2A473J CHIP R 47K J 1/10W

R18 RK73GB2A000J CHIP R 0 J 1/10W











R30 -38 RK73HB1J103J CHIP R 10K J 1/16W





If a part reference number is listed in a shaded box, that part does not come with the PCB.

TH-K20A/K20E

14


Newparts

PARTS LIST


Newparts

M: TH-K20A(M)

K : TH-K20A(K)

E : TH-K20E(E)




R47 RK73GB2A105J CHIP R 1.0M J 1/10W

R48 RK73GB2A102J CHIP R 1.0K J 1/10W





R105 RK73HB1J331J CHIP R 330 J 1/16W













R124 RK73HB1J331J CHIP R 330 J 1/16W

R125 R92-3637-05 CHIP R 0.39 J 1/3W

R126 RK73HB1J271J CHIP R 270 J 1/16W

R127 R92-3637-05 CHIP R 0.39 J 1/3W

R128 RK73HB1J271J CHIP R 270 J 1/16W

R129 R92-3637-05 CHIP R 0.39 J 1/3W

R130 RK73FB2B000J CHIP R 0 J 1/8W










R212 RK73HB1J101J CHIP R 100 J 1/16W






R220 RK73HB1J681J CHIP R 680 J 1/16W

R221 RK73HB1J331J CHIP R 330 J 1/16W


R226 RK73FB2B000J CHIP R 0 J 1/8W

R227 RK73HB1J331J CHIP R 330 J 1/16W


R229-231 RK73HB1J823J CHIP R 82K J 1/16W


R233,234 RK73HB1J105J CHIP R 1.0M J 1/16W



R237 RK73HB1J471J CHIP R 470 J 1/16W





R243 RK73HB1J105J CHIP R 1.0M J 1/16W






R252,253 RK73HB1J472J CHIP R 4.7K J 1/16W

R300-302 RK73HB1J102J CHIP R 1.0K J 1/16W






R311-313 RK73HH1J473D CHIP R 47K D 1/16W






R319 RK73HB1J181J CHIP R 180 J 1/16W





R324 RK73HB1J561J CHIP R 560 J 1/16W

R325 RK73HB1J471J CHIP R 470 J 1/16W






R331,332 RK73HH1J563D CHIP R 56K D 1/16W

R333,334 RK73HH1J473D CHIP R 47K D 1/16W







R347 RK73GB2A473J CHIP R 47K J 1/10W


R351 RK73HB1J101J CHIP R 100 J 1/16W



R355 RK73HB1J471J CHIP R 470 J 1/16W

R357 RK73HB1J561J CHIP R 560 J 1/16W


R359 RK73HB1J331J CHIP R 330 J 1/16W














TH-K20A/K20E

15

PARTS LIST



nationNewparts

M: TH-K20A(M)

K : TH-K20A(K)

E : TH-K20E(E)





R380 RK73HB1J2R2J CHIP R 2.2 J 1/16W







R389 RK73HH1J153D CHIP R 15K D 1/16W

R400,401 RK73HB1J224J CHIP R 220K J 1/16W










R431 RK73HB1J000J CHIP R 0 J 1/16W M

R432 RK73HB1J000J CHIP R 0 J 1/16W K

R433 RK73HB1J000J CHIP R 0 J 1/16W E


R438 RK73HB1J681J CHIP R 680 J 1/16W



R441 RK73HB1J101J CHIP R 100 J 1/16W

R442 RK73GB2A221J CHIP R 220 J 1/10W

R443 RK73HB1J101J CHIP R 100 J 1/16W

R444,445 RK73GB2A221J CHIP R 220 J 1/10W

R446 RK73GB2A331J CHIP R 330 J 1/10W

R447-451 RK73HB1J122J CHIP R 1.2K J 1/16W

R452,453 RK73HB1J104J CHIP R 100K J 1/16W





S417 S70-0514-05 TACT SWITCH (MONI)

S418 2B S70-0414-05 TACT SWITCH (PTT)

MIC300 2A T91-0673-05 MIC ELEMENT

D1 ,2 1SV325F VARIABLE CAPACITANCE DIODE

D3 HSC277 DIODE

D4 ,5 HVC350B VARIABLE CAPACITANCE DIODE

D6 DA2S101 DIODE

D7 ,8 HSC277 DIODE

D9 -11 DA2S101 DIODE

D101,102 HVC131 DIODE

D103-105 RN142S DIODE

D200,201 HVC350B VARIABLE CAPACITANCE DIODE

D203,204 HVC350B VARIABLE CAPACITANCE DIODE

D300 KDR731 DIODE

D301 GN1G DIODE

D302 RB521S-30 DIODE

D304 RB521S-30 DIODE

D305 � DZ2S068(M) ZENER DIODE

D401 � DZ2S036(0) ZENER DIODE

D404-407 1SS388F DIODE

D408 DA2S101 DIODE E

D408-411 DA2S101 DIODE K

D409-411 DA2S101 DIODE M

D410,411 DA2S101 DIODE E

IC1 MB15E03SL-E1 MOS-IC

IC200 TA31136FNG MOS-IC

IC300 R2A20178NP DAC IC

IC301-304 NJM12904RB1 MOS-IC

IC305 XC6120N302N-G MOS-IC

IC306 XC6209B502P-G MOS-IC

IC307 TA7368PL MOS-IC

IC308 XC6209B502P-G MOS-IC

IC400 EX25064ATA00A ROM IC

IC401 R5F2L3ACCKEKA MCU

Q1 LTC014EEBFS8 TRANSISTOR

Q2 2SC5383-T111 TRANSISTOR

Q3 MCH3914(7)-H FET

Q4 2SC5108(Y)F TRANSISTOR

Q5 2SC5636 TRANSISTOR


Q7 2SC5383-T111 TRANSISTOR

Q101 2SC4926YD TRANSISTOR

Q102 RFM01U7P FET

Q103 RD07MUS2BT112 FET


Q200 LTA023JEBFS8 TRANSISTOR

Q201,202 KTC4080E-P TRANSISTOR

Q203,204 3SK318 FET


Q301,302 LTC044EEBFS8 TRANSISTOR

Q303 2SK3577-A FET

Q304 SSM3J05FU-F FET

Q305 2SK3577-A FET

Q306 SSM6J08FU(F) FET


Q308 SSM3J05FU-F FET

Q400 2SC4649(N,P) TRANSISTOR

Q401 12A02CH TRANSISTOR

Q402 2SC4617(R) TRANSISTOR

Q403,404 RTIN144U-T111 TRANSISTOR

TH101 B57331V2104J THERMISTOR (100K)

TH200 NCP18WM474J0S THERMISTOR (470K)

S419 2B � W02-3766-05 ENCODER

If a part reference number is listed in a shaded box, that part does not come with the PCB.

TH-K20A/K20E

16

EXPLODED VIEW

Parts with the exploded numbers larger than 700 are not supplied.

If a part reference number is listed in a box on the exploded view of the PCB, that part does not come with the PCB.

These parts must be ordered separately.

A

A

B

B

Cx13

: M : K : E

48

49

51

52

54

33

23

1

47

TX-RX unit

32

46

263

29

36

19

7

VR300

S419

7

700

701

J300

J301

2

A : N09-2438-05B : N80-2606-43C : N83-2005-48

107

MIC300

21

24

27

34

4

8

31

106

105

103

101

102

104

X57

X57

X57

X57

X57

X57

X57

700700702

S418X57

6

3

2

1

BA

TH-K20A/K20E

17

PACKING

Parts with the exploded numbers larger than 700 are not supplied.

(B62-2365-00)9 INSTRUCTION MANUAL

(B62-2369-00): K, E 11 INSTRUCTION MANUAL

(B62-2370-00): K, E

12 INSTRUCTION MANUAL

712 WARRANTY CARD

710 PROTECTION BAG

61 CHARGER

37 PACKING FIXTURE

41 ITEM CARTON CASE

59 AC ADAPTER

58 AC ADAPTER

57 HELICAL ANTENNA

56 HELICAL ANTENNA(T90-1018-35): M

(W08-1247-15): K

(T90-1044-15): K, E

42 Belt clip

(J29-0756-05)

62 BATTERY ASSY(W09-1073-25)

(B62-2371-00) : E(B62-2372-00) : E(B62-2373-00) : E(B62-2374-00) : E

38 PACKING FIXTURE(H12-4326-02): K

(W08-1249-35)

(H12-4324-02): K

13~16 INSTRUCTION MANUAL

(H52-2486-02): K

(W08-1246-15): M, E

(B62-2375-00): M 18 INSTRUCTION MANUAL

K: TH-K20A(K)M: TH-K20A(M)

E: TH-K20E(E)

711 PROTECTION BAG

3

2

1

DC

TH-K20A/K20E

18

ADJUSTMENT

Note: • When performing the TH-K20 adjustment, a personal

computer, programming interface cable (KPG-22A/22U),

tuning cable (E30-3216-05) and tuning software (MCP-5T)

are required.

• When you do not want to lose data such as memory

channels or menu items, save the data using the MCP-

5A (Memory control program), then write the data to the

transceiver after performing the adjustment.

To download the MCP-5A software, go to:

http://www.kenwood.com/i/products/info/amateur/software_download.html

(This URL may change without notice.)

1. PC Tuning

The tuning software can be used with a PC. Figure 1

shows the setup of a PC for programming.

Fig. 1Note:

• You must install the KPG-22U driver in the computer to

use the USB programming interface cable (KPG-22U).

The KPG-22U driver runs under Windows XP, Vista or 7.

2. Tuning Software MCP-5T Description

The MCP-5T is the tuning software for the TH-K20. This

software runs under Windows XP, Vista or 7 on a PC. The

software allows a user to tuning the transceiver via Program-

ming interface cable (KPG-22A/22U) and tuning cable (E30-

3216-05).

Refer to the MCP-5T help fi le for the details on how to

use the MCP-5T.

3. Firmware version information

Press and hold the [ENT] key while turning the transceiv-

er power ON , the fi rmware version information appears on

the LCD.

Required Test Equipment

1. Stabilized Power Supply1) The supply voltage can be changed between 3V and 16V

and the current is 3A or more.

2) The standard voltage is 7.5V. (Power supply voltage

range: 6V-9V)

2. DC Ammeter (DC. A)1) Class 1 ammeter (17 ranges and other features)

2) The full scale can be switched between 300mA and 3A.

3) A cable with low internal loss must be used.

3. Frequency Counter (f. counter)1) Frequencies of up to 1GHz or so can be measured.

2) The sensitivity can be changed to 250MHz or below and

measurements are highly stable and accurate (about

0.2ppm).

4. Power Meter (terminal type)1) Measurable frequency: Up to 500MHz

2) Impedance: 50, unbalanced

3) Measuring range: Full scale of 10W

4) The specifi ed special connection cable must be used.

5. RF VM (RF V.M)1) Measurable frequency: Up to 500MHz or so

6. Linear Detector1) Measurable frequency: Up to 500MHz

2) Characteristic is fl at and CN is 60dB or more.

7. Digital Voltmeter1) Voltage range: FS = 18V or so

2) Input resistance: 1M or more

8. Oscilloscope1) Measuring range: DC to 30MHz

2) Provides highly accurate measurements for 5 to 25MHz

9. AF Voltmeter (AF V.M)1) Measurable frequency: 50Hz to 1MHz

2) Maximum sensitivity: 1mV or more

10. Spectrum Analyzer1) Measuring range: 10kHz to 1GHz or more

11. Standard Signal Generator (SSG)1) Maximum frequency: 500MHz or more

2) Output: –133dBm (0.05µV) to –13dBm (50mV)

3) Output impedance: 50

12. Tracking Generator1) Center frequency: 50kHz to 200MHz

2) Frequency deviation: ±35MHz

3) Output voltage: 100mV or more

13. Dummy Load1) 8, 3W or more

PC KPG-22A or KPG-22U Illustration is KPG-22A.

MCP-5T

Tuning cable(E30-3216-05)

D-SUB

Transceiver Transceiver

KPG-22A

PC

Gray

Gray/Black

1.5D-XV Lead wire

1.5D-XV Shield wire

+

–

+

–

SP

MIC

(9-pin)USB

KPG-22U

PC

TH-K20A/K20E

19

ADJUSTMENT

Frequency and Signaling

The transceiver has been adjusted for the frequencies

shown in the following table. When required, re-adjust them

following the adjustment procedure to obtain the frequencies

you want in actual operation.

■ Test Frequency

CH Receive (MHz) Transmit (MHz)

1 159.05000 159.10000

2 144.05000 144.10000

3 173.95000 173.90000

4 159.00000 159.00000

5 159.20000 159.20000

6 159.40000 159.40000

7~16 - -

■ Signaling

No. RX (Decode) TX (Encode)

1 None None

2 None 100Hz Square Wave

3 CTCSS 67.0Hz CTCSS 67.0Hz




7 DCS D023N DCS D023N

8 DCS D754I DCS D754I

9 NoneDTMF

(Code: 159D)

10 NoneDTMF

(Code: D)

11 None 1633Hz Tone

Preparations for Tuning the Transceiver

Before attempting to tune the transceiver, connect the

unit to a suitable power supply.

Whenever the transmitter is tuned, the unit must be con-

nected to a suitable dummy load (i.e. power meter).

The speaker output connector must be terminated with a

8 dummy load and connected to an AC voltmeter and an

audio distortion meter or a SINAD measurement meter at all

times during tuning.

■ Tuning frequency

Tuning point Receive (MHz) Transmit (MHz)

Low 136.05000 136.10000

Center 146.05000 146.10000

Center*1 155.05000 155.10000

High 173.95000 173.90000

*1: This center frequency is used for adjustment of DCS Balance

and Maximum Deviation.

Adjustment Points

TX-RX UNITComponent side view

Foil side view

Note: When replacing CF200 and CD200, apply bond to

the point shown in the fi gure.

CN300

CV

SPG

SPK

MIC300

+B

GN

D

ANT

BATT+

BATT-

CD200

S417

CF200

S418

PTTMONI

VR300

S419

J301 J300

MICSP

POW/VOL

ENCODER

BATT+ (7.5V)

BATT– (GND)

– +

TH-K20A/K20E

20

ADJUSTMENT

Common Section

Item Condition

Measurement Adjustment

Specifi cations / RemarksTest-equipment

Unit Terminal Unit Parts Method

1. Setting 1) BATT terminal voltage: 7.5V

2) SSG standard modulation

[Wide]

MOD: 1kHz, DEV: 3kHz

[Narrow]

MOD: 1kHz, DEV: 1.5kHz

2. VCO Lock

Voltage

1) Adj item: High Power

meter

TX-RX ANT

(CV)

MCP-

5T

4.0V

[V] indicator on the

PC window shows

VCO lock voltage.

Change the adjust-

ment value to get

VCO lock voltage

within the limit of the

specifi ed voltage.

±0.1V

Press [Apply] button to store

the adjustment value.

Note:

• Press [Apply] button to store the adjustment value. (For single adjustment point)

• Press [Apply All] button to store the adjustment value after all adjustment points have been adjusted. (For 3 adjustment point)

Transmitter Section

Item Condition




1. Frequency 1) Tuning point: High

Press [Transmit] button.

f. counter TX-RX ANT MCP-

5T

173.900MHz ±50Hz

2. High

Transmit

Power and

Protective

Current

1) Tuning point: Low, Center,

High (3 points)

BATT terminal voltage: 7.5V


Power

meter

Ammeter

MCP-

5T

5.5W ±0.1W

2.0A or less

3. Low

Transmit

Power


High (3 points)



1.0W ±0.1W

1.0A or less

4. Mid

Transmit

Power


High (3 points)



2.0W ±0.1W

1.5A or less

5. DCS

Balance

[Wide]


High (3 points)

(Signaling Square Wave)

Deviation meter fi lter

LPF: 3kHz

HPF: OFF


Power

meter

Deviation

meter

Oscilloscope

AG

AF VM

TX-RX ANT

SP/MIC

connector

MCP-

5T

Make the modulation

wave into square

waves.

6. Maximum

Deviation

[Wide]

1) Tuning point: Center, Low,

High (3 points)

AG: 1kHz/150mV

Deviation meter fi lter

LPF: 15kHz

HPF: OFF


4.0kHz

(According to

the larger +, –)

±100Hz

TH-K20A/K20E

21

ADJUSTMENT

Item Condition




7. Battery

Detection

Check

(User mode)

1) BATT terminal voltage: 7.1V

PTT: ON

TX Power: Low

Battery type: Li-ion

Power

meter

DVM

TX-RX ANT

BATT

terminal

Check Segment display: 4 dots

2) BATT terminal voltage: 7.8V

PTT: ON

TX Power: Low

Battery type: Li-ion

Segment display: 9 dots

• This transceiver is designed to make adjustments simple.

• It is not necessary to adjust the fi xed values for the DTMF-DEV, DQT-DEV, QT-DEV, and MIC sensitivity.

• The TX-DEV Narrow setting uses the Wide calculated adjustment level value.

Receiver Section

Item Condition




1. Band Pass

Filter


High (3 points)

SSG output: –90dBm

(7.08µV)

SSG DEV: 3.0kHz

SSG

DVM

Oscilloscope

AF VM

TX-RX ANT

SP/MIC

connector

MCP-

5T

[Automatic Adjust-

ment]

Press [Start] button

of “Auto Tuning”.

Press [Apply] button

to store the adjust-

ment value after the

automatic adjust-

ment has fi nished.

2. Sensitivity

Check

[Narrow]

1) Tuning point: Low, High

(2 points)


(0.22µV)

SSG DEV: 1.5kHz

Check 12dB SINAD or more

3. Squelch

Level 2 Write

[Wide]


High (3 points)


(0.2µV)

SSG DEV: 3.0kHz

MCP-

5T

Write

[Narrow] 2) Tuning point: Low, Center,

High (3 points)


(0.2µV)

SSG DEV: 1.5kHz

4. S Meter 1

Write

(RSSI)

1) Tuning point: Center

(1 points)


(0.22µV)

SSG DEV: 3.0kHz

MCP-

5T

Write S Meter Icon (2 dots)

S Meter

FULL Write

(RSSI)

2) Tuning point: Center

(1 points)


(1.26µV)

SSG DEV: 3.0kHz

Write S Meter Icon (9 dots)

• The Squelch Level 1 setting uses the Squelch Level 2 calculated adjustment level value.

22

JIHGFEDCBA

1

2

3

4

5

6

7

8

9

10

11

12

13

14

CN

20

2

R4

22

F4

24

R425

R4

31

R4

32

R4

33

R447

R4

48

R4

49

X4

00

C411C412

R4

50

R451

C415

D4

04

D4

05

D4

06

D4

07

D4

08

D4

09

D4

10

D4

11

D414

D415

D416

D417

D418D419

D420D421

IC4

01

D422D423

D424D425

CN30CN304

Q4

00

CV

1

25 26

7576

100

J79-0325-09

MODE

GND

RESE

5R

TH-K20A/K20E PC BOARD

Ref. No. Address

IC301 8Q

IC304 6P

IC305 6M

IC306 5N

IC307 4P

IC308 4N

IC401 6J

Q300 6Q

Q301 5P

Ref. No. Address

Q302 5P

Q303 4O

Q304 7N

Q305 4O

Q306 5P

Q308 4N

Q400 7H

D300 8O

D301 5M

D302 5N

Ref. No. Address

D304 5N

D305 9O

D404 5C

D405 5D

D406 5E

D407 5F

D408 5D

D409 5E

TX-RX UNIT (X57-821X-XX) 0-11: K 0-20: M 2-71: E

Ref. No. Address Ref. No. Address

D410 5E

D411 5E

D415 2J

D416 4G

D417 8G

D418 3F

D419 3D

D420 5F

D421 5D

D422 7F

D423 7D

D424 9F

D425 9D

D426 8R

D427 7R

D414 10J

Component side view (J79-0325-09)

IC300 6O

23

J K L M N O P Q R S

1

2

3

4

5

6

7

8

9

10

11

12

13

14

DG S

D

G S

D

GS

DG S

D

D

GS

R4

40

R4

41

R443

R4

45

R4

46

F3

00

F3

01

C421

C4

23

C425

R4

66

R470

Q300

Q3

01

Q3

02

Q3

03

Q3

04

Q3

05

Q306

Q3

08

D414

D415

D426

D427

R3

00

R3

01

R3

02

R3

03R

30

4

R3

05

R3

07

R308

R309

R310

R3

11

R312

R3

13

R314

R315

R3

16

R3

17

R318

CN300

CN303CN304

SB

SB

R323

GN

D

5M

5T

5C

R3

35

R336

R3

37

R338

R3

39

C301

C302

C3

04

R340

C305

R341

R342

C3

06

C307

C3

08

R3

45

R3

46

R3

47

C3

10

C3

11

C312

C313

R3

50

an

d

C3

14

R3

51

R353

R3

54

R3

55

R357

R3

58

R3

59

C3

21

C3

22

R360

R3

62

R3

63

R364

R365

C329

R366

R367R3

68

C332

C333

R3

70

C3

34

C335

C336R

37

2C337

C338

R3

74

C339

R3

76

R3

77

R378

R379

C340

C341

C3

42

R3

80

C344

R389

C3

51

C352C

35

3

C354

C356

C358

C359

D3

00

C360

D3

01

D302

C363

D304

C364

D305

C365C366

C367C

36

9

C371

C372

C3

73

C3

75

C3

76

C3

77

C3

79

IC300

C3

80

IC301

C3

81

C383

IC304IC305

IC306

IC307

IC308

CP

1

50

51

1

3 4

5

1 67

121318

19

24

1

4 5

8

1

45

8

110

56

1

2

SPG

SPK

1

2

4

3

15

4 3

E

GND

RESET

5M

MIC300

+B

GN

D

+B

C3

74

PC BOARD TH-K20A/K20E

Component side

Foil side

Layer 1

Layer 2

Layer 3

Layer 4

TX-RX UNIT (X57-821X-XX) 0-11: K 0-20: M 2-71: EComponent side view (J79-0325-09)

24

JIHGFEDCBA

1

2

3

4

5

6

7

8

9

10

11

12

13

14

R4

02

R4

05

R4

14

R4

15

R2

35

R236

R2

37

R2

38

R239

R2

40

R2

41

R437

R243

R4

38 R439

R2

48

C404

C405

C406

C407

R452

C4

17

R453C418

C419

C4

20

C424

C427

C428

R4

64

S417

C2

51C253

C25

C255

C2

56

C2

59

C261

D203

C265

D4

01

L1

07

L1

08

L109L

11

0

L112

L113

L1

14

L115

IC4

00

R119

R319

R1

26

R1

27

R1

28

R1

29

R320

R3

21

R322

R325

R327

R328

R329

R330

R33

C3

16

C317

C318

C3

19

C1

25

C1

27C

12

9

C320

C324

R3

61

C325

C3

26

C327

C1

33C134

C328

C1

35

C136

C137

C138

R3

69

C139

C33

C1

40

C141

C1

44

C146

C345

R382C347

C154

R3

85R386

C1

57

R387

R3

88

C1

60

D1

01

D1

02

D1

03

C357

D104

Q204

C3

61

Q401

Q4

02

Q403

Q404

L2

11

L2

13

L214

IC302

IC303

C386

R326

S418

PTTMONI

VR300

S419 J301

J300

+

1

45

8

1

45

8

1 458

G D

SG

D1

05

TH-K20A/K20E PC BOARD

Ref. No. Address

IC1 8Q

IC200 8M

Ref. No. Address

Q7 9Q

Q101 4N

Q102 3N

Q200 8M

Q201 9O

Q202 8N

Q203 6M

Q204 6J

Ref. No. Address

Q401 9J

Q402 8J

D1 5P

D2 5P

D3 6P

D4 5Q

D5 5Q

D6 5P

D7 4P

Ref. No. Address

D101 4F

D102 4F

D103 4G

D200 6K

D201 6K

D203 5I

D204 6L

Ref. No. Address

Q1 6Q

Q2 4P

Q3 5Q

Q4 4Q

Q5 3Q

Q6 8R

IC302 6G

IC303 7F

IC400 8I

Q103 4L

Q104 4N

Q307 4O

Q403 8C

Q404 7C

D8 3P

D9 5R

D10 6R

D11 6Q

D104 5H

Ref. No. Address

D401 8J

TX-RX UNIT (X57-821X-XX) 0-11: K 0-20: M 2-71: EFoil side view (J79-0325-09)

D105 4G

25

J K L M N O P Q R S

1

2

3

4

5

6

7

8

9

10

11

12

13

14

R4

00

C20

R401

C2

1 C2

2

R403

C2

3

XF

20

0

R210

C2

5

R2

12

C26

R2

13

C2

7

R2

14

C2

8

R2

15

C29

R2

16

R2

18

C3

1

C3

2

C3

3

R2

20

C34

R221

C36

C37

C38

R419

C3

9

R225

R226

R2

27

R228

R229

C4

1

C42

C4

3

C4

4

R2

30

C4

5

R2

31

C4

6

R2

32

R2

33

C4

7

C4

8

R2

34

C4

9

R2

35

R236

R2

37

R239

C2

00

C50

C201

C5

1

C2

02

C203C204

TH

20

0

C2

05

C206

C2

07

R437

C2

08

CD200R4

38

C209

R439

R246R

24

7

R2

48

R249

C402

C211

C2

12R

44

2

C2

13

C214

R444

R2

51

C215 C2

16

R252

C2

17

R253

C2

18

C219

C4

13

C220

C4

14

F1

01

C2

21

C2

23

C4

17 C418

C2

26

C227C228

C229

C4

20

C230

C2

31

C2

32

C233

R4

64

C2

34

R4

65

C2

35

C2

37

C2

39

C2

40

C244

C2

45

C2

46

C247

C2

48

C1

C2

49

C2

C3

C4

C5

C6

C7

C8C

25

0

C9

C2

51C253

C254

C255

Q1

01

D1

Q1

02

D2

Q103

D3

Q1

04

D4

D5

D6

D7

D8

D2

00

D9

D2

01

D2

04

C266

Q307

L1

01

D4

01

L1

03

C2

70

L104

C2

71

L1

05

C272

L1

06

C2

73

L113

IC200

R101

R1

02R103

R1

04

R1

05

R107

R1

08

D10

D11

R1

09

CF200

R111

R1

12

R1

13

R1

14

R115

R1

16

R1

20

L1

R121

L2

L3

R124

L4

L5

R1

25

L6

R1

27

L8

L9

R1

29

R324

R1

30

L1

0

L11

L1

3

C101

R3

31

C102

R332

R3

33

C1

04

R3

34

C105T

H1

01

C1

06

C1

07

C108

C109

C110

IC1

C112

C113

C115

R10R11

R12

R1

4

R1

5

C1

25

C1

27

R18

R19

C3

23

R20

R2

1

R22

R23

R24

Q1

R25 Q2

R26

Q3

R2

7

Q4

R28

Q5

Q6

Q7

C3

30

C331

R30

R31R32

R33

R3

4

R2

R36

C147

R3

7

R3

C148

R4

R3

8

R5

R3

9

R6

R7

R8

R9

C150

R4

0

R4

1

C1

51

R382

C152

R3

83

R4

3

C153C154

C155

R4

5

C1

56

R4

6

R47

R48

C1

59

C1

60 C161

C162

Q2

00

Q201

Q2

02

Q203

Q204

Q401

Q4

02

L2

00

L2

01

L202

L204

L205

L206

L2

09

L2

11

L2

15

C382

L2

17

C3

84

C3

85

C386

X1

C10 C1

1C

12

C13

R200

R2

01

C15

C16

R203

C17

R204

C18

R2

05

C19

R206

R207

R208

R3

5

G D

SG

1 89

16

18

9 16

GD

G D

SG

BE

EC

GD SG

D

S

+

+

+

+

J79-0325-09

PC BOARD TH-K20A/K20E

Component side

Foil side

Layer 1

Layer 2

Layer 3

Layer 4


26

TH-K20A/K20E SCHEMATIC DIAGRAM

X57-821 1/1X57-821 1/4

MIC

SP

LEDG

LEDR

LAMP

KEYO2

KEYO4

KEYO1

KEYI1

KEYI2

KEYIT

KEYI3

KEYI4

ENC2

KEYO3

ENC1

C3

54

10

00

p

R358

47k

C3

47

10

00

p

R305

10k

Q301LTC044EEBFS8

D302

RB521S-30

F300

3.15A

R4

40

47

k

C3

44

27

0p

10

00

p

D3

01

GN

1G

R3

60

1.8

k

R3

72

47

k

MIC300

1

2

C3

69

0.0

47

u

C357

100u 6.3

C3

64

1u

J300 1

311

102

C3

67

1u

R3

68

27

0k

R363

1k

S4

18

C4

21

10

00

p

C3

65

10

00

p

R351

100

R3

67

33

0k

R362

330k

C3

58

4.7

u

C3

51

10

00

p

R359

330

R370

470k

Q302LTC044EEBFS8

R365

2.2k

CN303

C3

63

10

00

p

R355

470

R350

18k

R354

1k

C353

0.047u

R446

330

D427

B30-1779-05

R445

220

D426

B30-1782-05

IC308XC6209B502P-G

1NC

2VSS

3CE

4 VIN

5 VoUT

C3

75

1u

C3

77

R3

79

10

0k

0.0

1u

C4

24

C3

45

10

0p

J301 1342

R364

1k

C3

66

10

u

R3

77

47

k

SSM3J05FU-FQ308

Q403RT1N144U-T111

Q404RT1N144U-T111

R4

43

10

0

C3

56

10

u

C4

23

10

00

p

S4

17

CN305

IC307TA7368PL

1NC1

2VCC

3NC2

4VIN

5RIPPLE6 NF

7 PHASE

8 PRE-GND

9 PW-GND

10 PoUT

C373

C372

10u

2SK3577-A

Q303

R3

74

10

k

SSM6J08FU(F)Q306

C3

83

10

00

p

C3

84

10

00

p

SSM3J05FU-F

Q304

2SK3577-AQ305

IC306

XC6209B502P-G

1 NC

2 VSS

3 CE

4VIN

5VoUT

C3

76

C3

80

10

00

p C3

82

27

0p C

38

5

10

00

p

F301

0.315A

VR300

R353

10k

R361

47k

D4

18

D4

19

R4

48

1.2

k

D4

14

B30-2261-05

D4

15

R4

44

22

0

R4

47

1.2

k

D4

20

R4

42

33

0

R4

49

1.2

k

D4

16

B30-2337-05

D4

21

D4

17

D4

01

DZ

2S

03

6(0

)

C4

17

10

00

p

2SC4617(R)Q402

C4

19

10

u

12A02CHQ401

R437

3.3k

C4

20

10

00

p

R4

38

68

0

R4

39

33

kC4

18

10

00

p

CO

M0

CO

M1

CO

M2

CO

M3

SE

G0

SE

G1

SE

G2

SE

G3

SE

G4

SE

G5

SE

G6

SE

G7

SE

G8

SE

G9

SE

G1

0

SE

G1

1

SE

G1

2

SE

G1

3

SE

G1

4

SE

G1

5

SE

G1

6

SE

G1

7

SE

G1

8

SE

G1

9

SE

G2

0

SE

G2

1

SE

G2

2

SE

G2

3

SE

G2

4

SE

G2

5

SE

G2

6

SE

G2

7

SE

G2

8

SE

G2

9

SE

G3

0

SE

G3

1

S419

CB

A

CN300

1

2

D4

23

D4

22

D4

25

R4

50

1.2

k

R4

51

1.2

k

D4

24

R4

53

10

0k

R4

52

10

0k

R4

64

27

k

R376

0

C359

0.01u

S412

D409

D405

1SS388F

S409

D406

1SS388F

S406

S415 D411

DA2S101

S413

S411

S407

S410

S408

D410

DA2S101

S405

D404

1SS388F

S414

D408

D407

1SS388FS416

R466

Q307LTA023JEBFS8

C3

61

0.2

2u

C3

60

0.2

2u

C3

79

22

0p

R3

78

27

k

C381

0.1u

IC305

XC6120N302N-G

1N

C

2V

SS

4

VIN

3

Vo

UT

D3

04

RB

52

1S

-30

R3

80

2.2

R4

41

10

0

R4

70

47

K

R3

66

0

D3

05

DZ

2S

06

8(M

)

R357

560

C3

71

0.0

27

u

R431

R433

R432

VO

L O

UT

RESET

PTT

PTT/RXD

MICIM

TXD/REMSPK

5MS

AFO

5M

5MSC

SP MUTE SW

BATT-

BATT+

SPM

EXPTT

TXD

RXD

SPG

5MS

BATTERYTERMINAL

REG

+B

SB

SPK

SPG

SB

MONI

AF POWER AMPSPG

KEY BACKLIGHT

REM

REM

0

D

9

6

#

8

A

42

C

1

B

3

75

0-11

0-20

2-71

MONI

LCD

C3

52

4.7

u

1u

0

M

E

K

X57-8210-XX

0-20

0-11

2-71

0

R431

0

NO 0

R432

NO

NO

R433

NO

NO

S401 S402 S403 S404

D414,D415 D416-D425

INT SP

+

-

+B

0.0

1u

C4

25

100p

NO

D408 D409

DA2S101

DA2S101

DA2S101

DA2S101

NO

NO

LEDGREEN

LEDRED

DC SW

DC SW

DC SWDC SW

VOLTAGEREGULATOR/5V

DC SW

DC SW

DC SW

VOLTAGEDETECTOR/RESET

VOLTAGEREGULATOR/5V

PROTECT

POWER SW/AF VOLIUM

OVER VOLTAGELIMITTER

LED SWITCH

BACKLIGHT

CONTROL

SWITCH

REVERSE CURRENTPREVENTION

D304



D404-407

Key matrix

D408-D411

SURGEABSORPTION

BACKLIGHT

DC SW

5MS

5MS

5MSC

RESET

SPM

5CC

5TC

REM

INPTT

RXD

EXPTT

REM

TXD

5CC

5TC

5RC

5RC

5M

+B

SB

5C

5R

5T

TX-RX UNIT(X57-821X-XX)

D401

INT MICINT MICINT MIC

ENC

+B

GND

INPTT

SB

LCD BACKLIGHT

C374

0.056u

7.5V

5.01V

ON:7.49VOFF: 0.33V

AF AMP

AF AMP ON:3.30VOFF: 0.51V

AF AMP ON:4.99VOFF: 0V

R:4.89VT: 1.59V

7.5V

OFF:0.40VON:5.57V

OFF:0VON:4.98V

OFF:0VON:5.02V

ON:2.75VOFF: 0V

ON:5.0VGREEN LED

ON:5.0VRED LED

A B C D E

1

3

4

5

6

7

2

27

SCHEMATIC DIAGRAM TH-K20A/K20E

X57-821 1/1X57-821 2/4

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SE

G3

0

SE

G2

9

SE

G2

8

SE

G2

7

SE

G2

6

SE

G2

5

SE

G2

4

SE

G2

3

SE

G2

2

SE

G2

1

SE

G2

0

SE

G1

9

SE

G1

8

SE

G1

7

SE

G1

6

SE

G3

1

COM2

COM0

COM3

COM1

LAMP

KEYO4

KEYO3

KEYO2

KEYO1

KEYI1

KEYI2

KEYI3

KEYI4

KEYIT

KEYIS

MO

NI

LE

DG

LE

DR

EN

C2

EN

C1

C3

42

10

00

p

1000p

R347

47k

C3

41

0.0

1u

C4

11

12

p

R3

34

47

k

0 .01u

R332

56k

R3

46

27

0k

CN304

R4

22

1k

R383

10k

R345

82k

CN309

CN

31

0

CN

31

1

CN

31

2

C340

0.01u

C412

1p

C4

15

12

p

2SC4649(N,P)Q400

C414

1000p

C413

0.1u

C4

02

X40011.0592MHz

R331

56k

27

0p

C3

30

27

0p

R3

33

47

k

R4

14

R4

05

R419

4.7k

CN

30

7

CN403

CN400

CN401

CN402

R4

15

R4

25

47

0k

R424

1k

CN

30

8

CN

30

6

R3

82

8.2

k

IC401

R5F2L3ACCKEKA

1 2 3 4 5 6 7 8 9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

R4

00

22

0k

R4

03

22

0k

R4

01

22

0k

C4

04

C4

05

C4

06

C4

07

R4

02

R4

65

47

k

CP1

C3

86

0.0

47

u

IC400EX25064ATA00A

1 S

2 Q

3 W

4 VSS 5D

6C

7HoLD

8VCC

EEPROM

5M

SB

5T

5C

5R

SB

+B

DAT

CLK

RESET

5M

GND

MODE

CLK

DAT

E2PCS

KE

YIT

KE

YIS

HS

DO

LS

DO

WK

UP

O

VR

EF

MO

DE

XC

IN

XC

OU

T

RE

SE

T

XO

UT

VS

S

XIN

VC

C

BS

FT

INP

TT

5R

C

EN

C2

EN

C1

RxD

TxD

PL

LE

N

PL

LP

S

PL

LL

D

NC

5TC

5C

C

COM0

COM1

COM2

COM3

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SE

G1

6

SE

G1

7

SE

G1

8

SE

G1

9

SE

G2

0

SE

G2

1

SE

G2

2

SE

G2

3

SE

G2

4

SE

G2

5

SE

G2

6

SE

G2

7

SE

G2

8

SE

G2

9

SE

G3

0

SE

G3

1

LE

DR

LE

DG

5V

C

5M

SC

MO

NI

CL

K

DA

TA

E2PIN

E2PCS

VOLCS

VDCSW

CURRENT

VOX

REM

BATT

THERM

RSSI

SQL

LSDI

CVDET

KEYO4

KEYO3

KEYO2

VL1

VL2

VL3

SHIFT

KEYO1

VL4

KEYI1

KEYI2

KEYI3

KEYI4

5M

SC

CL

K

DA

T

HSDO

5V

C

SP

M

5R

C

LAMP

W/N

E2PIN

E2

PIN

E2

PC

S

PTT

5C

C

SP

M

C3

31

C427

C428

10

00

p

22

u

22

u

22

u

22

u4

.7k

4.7

k

4.7

k

4.7

k

SWITCH

MCU

RESET

5MSC

SPM

5CC

5TC

REM

5MS

INPTT

EXPTT

RXD

TXD

5RC

5M

+B

SB

5C

5C

5C

+B

+B

5R

5R

5T

5T 5T

RSSIRSSI RSSI

5T

SQL SQL SQL

W/N

THERM THERM

SHIFT SHIFT

CURRENT

VDCSW

5MS

5MS

PLLLD

PLPS

CLK

DAT

PLLE

LSDI

VOLCS

VOLCS

VDCSW

5MS

DAT

VOX

LSDI

CLK

5VC

THERM

SHIFT

CURRENT

LSDO LSDO

CVDET CVDET

VOX

5VC

L77-2974-05

EX

EXPTT EXPTT

GND

5.01V

5.0V

7.51V

F G H I J


28

TH-K20A/K20E SCHEMATIC DIAGRAM

X57-821 1/1X57-821 3/4

C4

7

4p

C3

01

0.1

u

C27

47p

C339

10p

R3

18

2.7

k

C4

9

10

00

p

R2

3

10

C51

22p

R3

41

0

C3

14

0.0

1u

C2

5

10

00

p

C3

2

10

00

p

R315

560k

R2

8

82

0

R2

1

L1

1

82

n

IC301NJM12904RB1

1

2

3

4GND

5

6

7

8V+

R335

10k

R3

23

1k

C45

22p

R1

9

5.6

k

R3

14

82

0k

C3

8

6.8

u1

0

2SC5636Q5

R3

2

10

k

R3

16

10

k

X1

19.2MHz

VCoNT

GNDoUTPUT

VCC

R2

0

R3

17

3.9

k

R337

10k

R3

09

5.6

k

R27

2.2k

C4

4

10

00

p

C3

3

10

00

p

R300

C337 0.01u

C34

15p

C4

8

0.0

1u

R2

5

R342IC304

NJM12904RB1

1

4GND

5

8V+

C5

0

5p

C3

10

0.1

u

C338

R301

L9

12

0n

R2

2

C3

33

82

00

p

R3

03

10

k

R3

04

10

k

C3

08

0.1

u

R302 1k

C305

1u

C31

12p

IC1

MB15E03SL-E1

1

oSCIN

2

oSCoUT

3

VP

4

VCC

5

Do

6

GND

7

XFIN

8

FIN

9 CLoCK

10 DATA

11 LE

12 PS

13 ZC

14 LD/FoUT

15 P

16 R

C4

3

0.0

1u

R37

R36

R38

R3

5

R3

4

R3

3

R3

9

10

C4

1

0.0

1u

R3

0

10

kC28

9p

L10

27n

C2

6

15

p

C2

9

15

p

C42

1000p

D9

DA

2S

10

1

R3

07

1M

C3

34

0.0

27

u

C3

36

82

0p

R338

10k

R3

36

10

k

D8

HSC277

D7

HSC277

R4

1

3.9

k R4

3

10

C46

R4

0

D1

0

DA

2S

10

1

R4

5

33

k

2SC5383-T111Q7

R4

6

10

0k

R3

10

39

k

C3

07

0.2

2u

C306

1u

D300

KDR731

R31

10k

C324

0.18u

C320

0.18u

R3

30

10

0k

R326

5.6k

R325

470

IC302

NJM12904RB1

1AoUT

2A-IN

3A+IN

4GND5 B+IN

6 B-IN

7 BoUT

8 V+

C318

0.18u

C3

16

0.1

8u

R321

2.2k

IC303

NJM12904RB1

1

2

3

4GND

5

6

7

8 V+

R320

56k

R319

180

C3

22

0.3

9u

C3

17

0.1

u

C3

25

0.1

u

R2

4

3.3

k

R3

39

1k

R3

40

1k

C3

35

27

0p

C3

13

0.1

u

R308

1k

C3

02

0.1

u

C3

9

0.6

8u

20

C3

26

18

0p

R329

330k

R327

100k

R328

10k

C304

0.047u

C3

21

0.1

8u

R3

87

33

k

C319

0.18u

C5

R3

1k

R4

15k

C2

0.033u

C3

1u

C7

0.5

p

D4

HV

C3

50

B

R5

1k

R2

2.7

k

D3

HS

C2

77

R6

10

0k

R8

10

k

R7

10

0k

R9

100k

C9

1u

C1

0

8p

L6

10u

C1

2

1u

6.3

D5

HV

C3

50

B

C1

5

10

p

C1

7

9p

MCH3914(7)-HQ3

C1

9

0.0

1u

R10

22

C2

0

10

00

p

2SC5108(Y)FQ4

C22

0.5p

C1

8

R1

1

4.7

k

D6

DA

2S

10

1

C1

6

22

u1

0

C1

3

10

00

p

2SC5383-T111Q2

R1

4

1k

C2

3

10

00

p

L1

220n

C6

0.022u

L4

27

n

C1

0.1

8u

R3

88

1k

R3

86

82

k

R385

1k

R322

3.3k

L2

18

0n

R1

2

22

0

L8

C3

7

0.1

5u

C4

0.0

22

u

C8

10

00

p

C1

1

10

00

pR

18

0

Q1LTC014EEBFS8

Q6

LTC014EEBFS8

IC300R2A20178NP2

1VIN2

2VDD

3LD

4CLK

5DI

6VIN3

7

Vo

UT

38

Vo

UT

4

9V

IN4

10

VIN

5

11

Vo

UT

5

12

Vo

UT

6 13VIN6

14VDAREF1

15VDAREF2

16RESET

17GND

18VIN7

19

Vo

UT

7

20

Vo

UT

8

21

VIN

8

22

VIN

1

23

Vo

UT

1

24

Vo

UT

2

C2

1

10

00

p

R4

7R15 47k

D1

1S

V3

25

F

D2

1SV325F

Q300LTA023JEBFS8

R3

12

47

k

R3

89

15

k

R3

11

47

k

R3

13

47

k

C3

32

1u

L3

10u

L5

22

n

C3

29

2.2

u

C3

27

47

00

pC

32

8

0.0

1u

C3

11

0.0

27

u

C3

12

47

00

p

L13

4.7n

R48

1k

D11

DA2S101

R369

0

-

T0

5MS

+

MIC AMP/LIMITER

+

5MS

+

+

-

-

-

D/A CONVERTER

PL

LE

N

DA

TA

MOD

VCO

-

QT/DQT FILTER

-

+

+

5VC

CL

K

SHIFT

10

u

10

k

39p

10

00

p

3.3

k

33

0

3.3

k

1000p

56

10k

10k

10k

10

k

10

k

10

k

1M

560k

1000p

1k

1k

TX/RX SW

RF AMP

RF BUFFER

FREQUENCYCONTROL

D1,2

MODULATOR

D4

TX/RX SW

Q1

RIPPLE FILTER

CURRENTSTEERING

D11

PLL SYSTEM

DC SW

VOLTAGEREGULATOR/3V

TCXO

LSD BUFFER

AF FILTER

CURRENTSTEERING

DC SW

RF SWITCH

D3 D5

FREQUENCYCONTROL

SPEED UP

D6

D7,8

5C

+B

5R 5R

5T 5T5T

5R

+B

+B

5C

5MS

5MS

5C

5R

5R

W/N

RSSI RSSI RSSI

SQL

W/NW/N

SQL SQL

CURRENT

CURRENTCURRENT

THERM

SHIFT

THERM THERM

VDCSW VDCSW

VDCSW

5MS

5MS

PLLD

PLPS

CLKDAT

PLLE

LSDI LSDI LSDI

VOLCS

LSDO

CVDET

VOX

5VC

BPFBPF

POWC POWC

L77-3074-05

SPEED UPVCO

TCXO OUT

CV

RXLO

1.80V

R:1.03VT:1.74V

5.0V

R:4.88VT: 1.59V

0.70V

4.15V

4.98V

2.90V

R:4.89VT: 1.59V

R:1.80VT:1.81V

K L M N O


29

SCHEMATIC DIAGRAM TH-K20A/K20E

X57-821 1/1X57-821 4/4

Note : The components marked with a dot (•) are parts of layer 1.

-t

-t

R1

26

27

0C1

12

0.0

1u

L2

05

12

0n

R218

1k

C218

5p

C1

48

10

00

p

R2

06

33

0k

R324

560

C2

29

5p

C1

08

15

p

C2

12

0.0

33

u

C2

05

0.1

u

RFM01U7PQ102

C217

0.01u

C230

10p

R1

11

82

k

C1

09

C134

1000p

R2

00

47

C209

47p

C1

47

1u

R2

03

68

k

C113

56p

R214

330k

R1

02

CD200

C138

6p

C2

32

10

0p

R1

28

27

0

C2

14

0.1

u

L204

22n

C2

16

22

p

C1

15

C1

41

12

p

R220

680

D1

03

RN

14

2S

R1

13 L112

9T

C2

21

0.0

1u

RD07MUS2BT112

Q103

IC2

00

TA

31

13

6F

MG

1O

SC

IN

OS

Co

UT

MIX

oU

T

VC

C

IFIN

DE

C

FIL

oU

T

8F

ILIN

9

AF

oU

T

QU

AD

IFo

UT

RS

SI

NO

ISE

DE

T

NO

ISE

RE

C

GN

D1

6

MIX

IN

C1

57

C1

37

12

p

C2

19

22

p

R204

C2

01

10

00

p

C2

31

5p

C1

61

C1

05

R2

6

4.7

k

C2

03

27

0p

C215

0.01u

C3

6

10

00

p

R1

15

56

k

R1

29

0.3

9

C206

C1

62

R1

12

47

R1

21

39

k

R2

01

1.5

k

C1

53

10

00

p

R1

25

0.3

9

C1

60

10

00

p

C2

26

8p

C1

10

C1

51

2.2

uC

22

0

10

00

pC

15

2

R216

180k

R1

05

33

0

C136

1000p

C2

27

6p

C2

02

0.0

1u

R1

14

47

C3

23

33

00

p

R2

13

47

C107

1000pC101

22p

R1

27

0.3

9

R1

09

10

0k

C2

11

0.1

u

R2

12

10

0

C140

6p

C1

39

27

p

C1

44

XF200

C207

L1

06

9T

C1

50

10

00

p

L1

08

2.2

u

R205 2.2k

C2

04

18

00

p

2SC4926YD

Q101

R103

2.2k

R1

04

18

C1

04

10

00

p

R1

07

18

R1

30

0

C2

08

0.1

u

C2

13

0.1

u

L1

03

10

0n

L104

33n

R1

24

C1

55

10

00

p

C1

56

10

00

p

R116

0

L107

6T

TH

10

1

B5

73

31

V2

10

4J

10

0k

C223

0.01u

D101

HVC131

D102

HVC131

C2

00

R101

18

R120

1.8k

C1

59

2.2

u

C1

54

10

00

p

C1

46

18

p

C228

0.01u

R221

330

R1

08

10

L1

01

68

n

C102

1000p

L110

9T

L109

9T

C2

33

10

00

p

C1

06

9p

L1

05

82

n

R2

37

47

0

R2

38

R2

41

CN202

L2

06

82

0n

R2

31

C2

49

39

p

C2

54

10

00

p

R2

29

R2

28

1k

L2

09

C2

61

39

p

C265

47p

C2

46

39

p

C2

35

C248

1p

C2

59

10

00

p

C2

47

10

00

pD

20

1

HV

C3

50

B

D2

00

HV

C3

50

B

C256

47p

R2

40

C2

45

2p

C244

1000p

R2

30

D2

03

HV

C3

50

B

3SK318Q203

R2

39

3SK318Q204

C2

55

C2

50

2p

R2

43

1M

C2

53

R236

82

R2

35

47

L2

01

56

0n

L2

00

56

0n

KTC4080E-P

Q201

KTC4080E-P

Q202

L2

02

82

0n

R2

25

47

C2

34

0.0

1u

C2

40

10

00

p

R119

0

F1

01

R2

15

0

R2

08

18

k

R210

68k

CF200

R2

07

2.7

k

C266

3p

R2

46

10

0k

R226

0

R2

47

3.3

k

C2

39

R2

27

33

0

C2

37

22

p

R232

0

C2

51

10

00

p

R2

48

1.5

k

C1

27

C1

25

C1

33

L114

5T

L113

3T

R249

1k

TH200

NCP18WM474J0S

L2

17

D2

04

HV

C3

50

B

C273

1p

C2

71

39

p

C2

70

1p

Q104LTC014EEBFS8

Q200LTA023JEBFS8

D1

04

RN

14

2S

R2

51

1M

R2

33

R2

34

L2

11

L2

13

68

n1

8n

L215

2.7n

R252

4.7k

R253

4.7k

C1

29

C1

35

6p

L115

6T

C272

3p

CN2

5R

450kHz

1st IF(38.85MHz)FM IF

IF AMP

Temp compensation

FINAL

DRIVE

5R

+B

MIXER

W/N

5T

10

00

p

270p

0.1

u

10

00

p

47

p

15

p

27

p

39

p

10

00

p

10

00

p

68

k

10

00

p

0.0

1u

10

00

p

1k

82

n

82

n

1M

1M

82

n

270p

10

u

10

00

p

10

00

p

82

k

82

k

82

k

L2

14

33

0

10

00

p

18

0k

10

00

p

39

0k

10

0k

10

0k

22

p

ANT

ANT SW

D101,102,103,104

VDC SW

RF AMP

BPF TUNING

BPF TUNING

D200,201,204

DOUBLER

SYSTEM

W/N SW

PRI DRIVE

5R

5T

W/N

RSSI RSSI

SQL SQL

CURRENTCURRENT

THERM

VDCSW

BPF

BPF

POWC

POWC

VDCSW

L79-1474-05

L71-0669-05

0.5

A

32

V

3 .3k

TCXO OUT

RXLO

TCXO OUT

RXLO

D1

05

RN

14

2S

L72-1042-05

R: 0VT:0.81V

R: 0VT:4.93V

Hi:1.48V

Lo:1.21V

Hi:3.25V

Lo:2.63V

Hi:1.49V

Lo:1.21V

R:4.98VT: 0V

7.5V

R:3.11VT: 1.03V

R:3.85VT: 1.26V

R:4.88VT: 1.59V

R:0.61VT: 0.59V

R:4.68VT: 1.53V

R:4.88VT: 1.59V

R:0.72VT: 0.71V

R: 0VT:4.32V

R: 0VT:1.09V

R: 0VT:4.91V

R:0VT:0.61V

R:2.68V

T: 0.89V

R:2.44VT: 0V

Mid:1.27V

Mid:2.78V

Mid:1.28V

W:0VN:5.01V

P Q R S T

2

1

3

4

5

6

7


TH-K20A/K20E

30

BLOCK DIAGRAM

IC400

AVR

Q1

BR255640FV1-W

MCU

CLK

FILTER

PLL SYSTEM

IC306

CURRENT

LCD/KEY BACKLIGHT

2

SW

XC6209B502P-G

SHIFT

EEPROM

R5F2L3ACCKEKA

Q3

IC1

IC401

MB15A02PFV2E1

LD

DAT

LOOP

THREM

5C

VCO oscillation frequencyRX: 174.850~212.845MHz(K,M,E)

TX: 136.000~173.995MHz (M) 144.000~147.995MHz (K)

5C

5V

VCO

PLLEPLPS

TX-RX UNIT (X57-821x-xx )

MCH3914(7)-H

CLK

X1

RSSISQL

SSM3J05FU-F

L77-1944-05

LSDO

TCXO

11.0592MHzL78-2974-05

X400

2SC4617(R)Q402

D414,D415 B30-2261-05

12A02CHQ401

LAMP

XINXOUT

D3HSC277

5M

CONV.D/A

5MS

SWBSFT

Q4002SC4919-S

RESETEXPTT

BATT

LEDG

INPTT

E2PINE2PCS

LEDRPLLEDATCLK

ENC2ENC1

5MSC

5RC5TC

5CC

PLLD

LSDI

5M

19.2MHz

SHIFT

LPF

LTC014EEBFS8

D1,D21SV325F

D4HVC350B

MOD

CONV.D/A

D5HVC350B

ASSIST

144.000~145.995MHz (E)

IC300(5/8)R2A20178NP

IC300(6/8)

R2A20178NP

Q6

INVERTLTC014EEBFS8 PLLD

5MS

FREQ

5MS

B30-1782-05

Q403

D426

(GRN)

LEDGLTC014EEBFS8

LTC014EEBFS8

5MS

DCSW

B30-1779-05

Q404

D427

(RED)

LEDR

3.3VREGQ7

2SC5383-T111DCSW

DCSW DCSW

SB

DATA

PROTECT

SB

D301GN1G

BATT+7.5V

VOLIN

+B

VR300R31-0684-05

PROTECT

D302RB521S-30

VOLOUT

BATT-

F300

3.15A SB

RESET

IC305XC6120N302N-G

RESET

Q304

5MS

5MSC

5M

DC SW

LTA023JEBFS8Q307

5R

5RC

S419W02-3766-05

ENC1

LCD B38-0939-05

D416~D425 B30-2337-05

COM0~COM3,SEG0~SEG31

KEY MATRIX

WIID/NARVDCSW

HSDO

MATRIX

DC SW

D404~D4071SS388D408~D411MA2S111-F

DIODE

AVR

IC308XC6209B502P-G

5VPROTECT

D304RB521S-30 SSM3J05FU-F

Q308

5T

5TC

5C

5CC

DC SW

BATT

VOX

SPM

ENC2

INPTT

MON

S418

S417

KEYI1~KEYI4,KEYIS,KEYIT

KEYO1~KEYO4

MON

ENC

VOL/PSW

PTT

MONI

TX

BUSY

TH-K20A/K20E

31

BLOCK DIAGRAM

2SC5383-T111

IC307

IF SYSTEM

38.85MHz

AMP

ANTBUFF

XF200

Q101

D103-D105RN1425

450kHz

BPF

TA7368FG

Q4

ANT SW

RF

HVC350B

3SK318

5R

Q202

MIXER

Q203

FILTER

2SC4926YD2SC5108(Y)F

HVC350BD203

TX/RX

Q2

5R

38.4MHz

Q204

MUTESW

Q201

IC304

TUNE

5R

TUNE

BPF

2SK3577-A

AMP

CF200

FINAL

5T

DRIVE

AF POWER AMP

D200,D201,D204

MCF

D101,D102HVC131

RIPPLE

5T

KTC4080E-P

DOUBLER

RFM01U7P

5R

SP

Q102

1st Local frequency174.850~212.845MHz(K,M,E)

RX: 136.000~173.995MHz (K,M,E)

144.000~145.995MHz (E)

TX: 136.000~173.995MHz (M) 144.000~147.995MHz (K)

SW

RF BPF

IF

HSC277

EXT

19.2MHz

3SK318

RF BPF

5R

IC200

DC SW

SSM6J08FU(F)

Q306

MIC AMP

TA31136FMG

AMP

PREDRIVE

D7,D8

AMPRSSI

V REF/

L71-0669-05

L72-1042-05

5T

+B

5VC

DC SW

Q200

TH101

DA2S101D6

5C

KTC4080E-PSQL

LTA023JEBFS8

IC301NJM12904RB1

LIMITER

MIC AMP

5C

CONV.D/A

FILTERAF

IC303NJM12904RB1

LSDI

WID/NAR

2nd Local

Q5

2SC5636

RFAMP

RD07MUS2BT112Q103

AMP

CD

CD200L79-1474-05

S8

5C

MICINT

SP

MUTESW

SB

Q303

MUTESW

Q305

LTC044EEBFS8

F301

Q302

SPM

Q301

INT

2SK3577-A

DC SWDC SW

LTC044EEBFS8

0.315A

VOLOUT

MIC

SPGTXDSPKAFO

PTT/RXDMICIM

5MS

J301E11-0717-05

J300E11-0484-05

MIC300T91-0673-05

D/A

IC300(1/8)

CONV.

R2A20178NPIC300(3/8)R2A20178NP

IC300(2/8)R2A20178NP

NJM12904RB1

DC SW

5MS

FILTER

QT/DQT

IC302NJM12904RB1

CN300

AFO

CONV.D/A

VOX DETVOX

MOD

D300KDR731

VOLIN

CONV.D/A

5MS

BPF

CONV.D/A

5MS

POWC

VDC SW

Q104

LTC014EEBFS8

VDCSW

F101

0.5A

IC300(7/8)R2A20178NP

IC300(8/8)R2A20178NP

-t

CURRENT

THREM

HSDO

HSDO

LTA023JEBFS8

Q300

5MS

5MS

5R

MICEXT

5MS

EXPTT

TH-K20A/K20E

32

LEVEL DIAGRAM

To m

ake

measure

ments

in the A

F s

ection, connect th

e A

C leve

l m

ete

r.

(AN

T in

put: –

53dB

m,1

kH

z F

M, 1.5

kH

z D

ev (

Narr

ow

).)

In the R

F s

ection, u

se a

hig

h im

pedan

ce p

robe. (A

NT

input: –

53dB

m, M

OD

off).

AG

is s

et to

the M

IC inpu

t becom

es 1

.5kH

z D

ev,

at 1kH

z M

OD

. (N

arr

ow

)

To m

ake

measure

ments

in the A

F s

ection, connect th

e A

C leve

l m

ete

r.

In the R

F s

ection, u

se a

1000pF

coup

ling c

apacitor.

Re

ce

iver

Sec

tio

n

Tra

ns

mit

ter

Se

cti

on

FM

IF

SY

ST

EM

DA

C

SS

G–

53

dB

mA

NT

–5

6.1

dB

m–

74

.2d

Bm

–6

6.8

dB

m–

50

.8d

Bm

–5

2.8

dB

m–

40

.3d

Bm

–5

7.1

dB

m–

29

.1d

Bm

31

mV

rms

27

mV

rms

2.4

Vrm

s2

.3V

rms

2.0

Vrm

s

C2

65

C2

56

C2

48

C2

73

C2

28

C2

23

C2

17

C3

22

C3

81

C3

57

SP

50

0m

W

Q3

03

Q3

05

IC3

07

IC3

00

IC2

00

Q2

02

XF

20

0M

IXE

RQ

20

3Q

20

4

RF

(C

EN

TE

R F

RE

QU

EN

CY

)IF

1 (

38

.85

MH

z)

IF2

45

0kH

zA

F (

1kH

z)

IC3

00

DA

C

AF

AM

P

C2

2

–2

9.1

dB

m

VC

O

C2

7C

34

C1

13

7.3

dB

m

C1

34

34

.9d

Bm

AN

T

50Ω

MIC

8.0

mV

rms

4.4

mV

rms

37

.4d

Bm

C1

01

12

.2d

Bm

C1

07

Q4

Q5

RX

LoD7

D8

Q1

01

Q1

02

Q1

03

AF

(1

kH

z)

RF

(C

EN

TE

R F

RE

QU

EN

CY

)

R3

03

Q3

+

–9

.1d

Bm

–1

.8d

Bm

–2

.5d

Bm

TH-K20A/K20E

33

OPTIONAL ACCESSORIES

BT-16 (Battery Case (6AAA/LR03))

■ External View

■ External View ■ External View

■ External View

EMC-11 (Clip Microphone with Earphone) KVC-22 (DC Vehicular Chager Adapter)

KNB-65L (Li-ion Battery Pack)

■ Specifi cations

Earphone unit

Impedance ................ 72 ±15% (16 ±15%: Speaker only)

Nominal input power .................................................. 20mW

Microphone unit

Impedance .........................................................1.5k ±30%

Sensitivity .......................................–42dB±3dB (at 1000Hz)

■ Specifi cations

Voltage ............................................................................ 7.4V

Battery capacity ................................................ typ 1520mAh

min 1460mAh

TH-K20A/K20E

34

MEMO

TH-K20A/K20E

35

SPECIFICATIONS

General

Guaranteed range (MHz) TX & RX 144~148 (K/M) / 144~146 (E)

Operation Frequency range (MHz) TX 136~174 (M) / 144~148 (K) / 144~146 (E)

RX 136~174

Mode F3E, F2D

Antenna impedance 50

Operating temperature range –20°C ~ +60°C (+4°F ~ +140°F)

Operating Voltage DC 6.0 ~ 9.0V (7.4V nominal)

Frequency stability Within ±2.5ppm

Dimensions W x H x D (projections not included) <with KNB-63L> 54 x 111.7 x 25.3 mm / 2.13 x 4.4 x 1.0 in

Weight <with KNB-63L> Approx. 210g / 7.4oz.

Transmitter

RF output power <with KNB-63L/ KNB-65L>

High 5.5W

Medium 2W

Low 1W

Modulation Reactance

Maximum frequency deviation Within ±5kHz

Spurious emission Less than -60dB

Modulation distortion Less than 5% (300Hz~3kHz)

Microphone impedance 2k

Receiver

Circuit type Double super heterodyne

Intermediate Frequency (IF) 1st IF: 38.85MHz 2nd IF: 450kHz

Sensitivity (12dB SINAD) Less than 0.16µV

Squelch sensitivity Less than 0.13µV

Selectivity-6dB More than 10kHz

-50dB Less than 28kHz

Audio output More than 400mW (8/ 10% distortion)

Note: All specifi cations (General, Transmitter and Receiver) are guaranteed within the amateur radio band.

Guaranteed frequency range .............................................................. 144~148MHz (K,M)

144~146MHz (E)

TH-K20A/K20E

J K L M N O P Q R SIHGFEDCBA

1

2

3

4

5

6

7

8

9

10

11

12

13

14

1

2

3

4

5

6

7

8

9

10

11

12

13

14

DG S

D

G S

D

GS

DG S

D

D

GS

CN

20

2

R4

22

F4

24

R425

R4

31

R4

32

R4

33

R4

40

R4

41

R443

R4

45

R4

46

R447

R4

48

R4

49

X4

00

C411C412

R4

50

R451

C415

F3

00

F3

01

C421

C4

23

C425

R4

66

R470

Q300

Q3

01

Q3

02

Q3

03

Q3

04

Q3

05

Q306

Q3

08

D4

04

D4

05

D4

06

D4

07

D4

08

D4

09

D4

10

D4

11

D414

D415

D416

D417

D418D419

D420D421

IC4

01

D422D423

D424D425

D426

D427

R3

00

R3

01

R3

02

R3

03R

30

4

R3

05

R3

07

R308

R309

R310

R3

11

R312

R3

13

R314

R315

R3

16

R3

17

R318

CN300

CN303CN304

SB

SB

R323

GN

D

5M

5T

5C

R3

35

R336

R3

37

R338

R3

39

C301

C302

C3

04

R340

C305

R341

R342

C3

06

C307

C3

08

R3

45

R3

46

R3

47

C3

10

C3

11

C312

C313

R3

50

an

d

C3

14

R3

51

R353

R3

54

R3

55

R357

R3

58

R3

59

C3

21

C3

22

R360

R3

62

R3

63

R364

R365

C329

R366

R367R3

68

C332

C333

R3

70

C3

34

C335

C336R

37

2C337

C338

R3

74

C339

R3

76

R3

77

R378

R379

C340

C341

C3

42

R3

80

C344

R389

C3

51

C352C

35

3

C354

C356

C358

C359

D3

00

C360

D3

01

D302

C363

D304

C364

Q4

00

D305

C365C366

C367C

36

9

C371

C372

C3

73

C3

75

C3

76

C3

77

C3

79

IC300

C3

80

IC301

C3

81

C383

IC304IC305

IC306

IC307

IC308

CV

CP

1

1

25 26

50

51

7576

100

1

3 4

5

1 67

121318

19

24

1

4 5

8

1

45

8

110

56

1

2

SPG

SPK

1

2

4

3

15

4 3

J79-0325-09

MODE

GND

RESET

5M

MIC300

+B

GN

D

5R

+B

C3

74

TH-K20A/K20E PC BOARD PC BOARD TH-K20A/K20E

Component side

Foil side

Layer 1

Layer 2

Layer 3

Layer 4

Ref. No. Address

IC301 8Q

IC304 6P

IC305 6M

IC306 5N

IC307 4P

IC308 4N

IC401 6J

Q300 6Q

Q301 5P

Ref. No. Address

Q302 5P

Q303 4O

Q304 7N

Q305 4O

Q306 5P

Q308 4N

Q400 7H

D300 8O

D301 5M

D302 5N

Ref. No. Address

D304 5N

D305 9O

D404 5C

D405 5D

D406 5E

D407 5F

D408 5D

D409 5E

TX-RX UNIT (X57-821X-XX) 0-11: K 0-20: M 2-71: E

Ref. No. Address Ref. No. Address

D410 5E

D411 5E

D415 2J

D416 4G

D417 8G

D418 3F

D419 3D

D420 5F

D421 5D

D422 7F

D423 7D

D424 9F

D425 9D

D426 8R

D427 7R

D414 10J

Component side view (J79-0325-09)TX-RX UNIT (X57-821X-XX) 0-11: K 0-20: M 2-71: EComponent side view (J79-0325-09)

IC300 6O

J K L M N O P Q R SIHGFEDCBA

1

2

3

4

5

6

7

8

9

10

11

12

13

14

1

2

3

4

5

6

7

8

9

10

11

12

13

14

R4

00

C20

R401

C2

1 C2

2

R4

02

R403

C2

3

XF

20

0

R210

R4

05

C2

5

R2

12

C26

R2

13

C2

7

R2

14

C2

8

R2

15

C29

R2

16

R2

18

C3

1

C3

2

C3

3

R4

14

R2

20

C34

R4

15

R221

C36

C37

C38

R419

C3

9

R225

R226

R2

27

R228

R229

C4

1

C42

C4

3

C4

4

R2

30

C4

5

R2

31

C4

6

R2

32

R2

33

C4

7

C4

8

R2

34

C4

9

R2

35

R236

R2

37

R2

38

R239

C2

00

C50

C201

C5

1

C2

02

C203C204

TH

20

0

R2

40

C2

05

R2

41

C206

C2

07

R437

R243

C2

08

CD200R4

38

C209

R439

R246

R2

47

R2

48

R249

C402

C404

C211

C405

C2

12

C406

R4

42

C2

13

C407

C214

R444

R2

51

C215 C2

16

R252

C2

17

R253

C2

18

C219

C4

13

C220

C4

14

F1

01

C2

21R452

C2

23

C4

17

R453C418

C419

C2

26

C227C228

C229

C4

20

C424

C230

C2

31

C2

32

C427

C233

C428

R4

64

C2

34

R4

65

C2

35

C2

37

C2

39

C2

40

C244

C2

45

C2

46

S417

C247

C2

48

C1

C2

49

C2

C3

C4

C5

C6

C7

C8C

25

0

C9

C2

51C253

C254

C255

C2

56

Q1

01

D1

C2

59

Q1

02

D2

Q103

D3

Q1

04

D4

D5

D6

D7

D8

D2

00

D9

C261

D2

01

D203

D2

04

C265

C266

Q307

L1

01

D4

01

L1

03

C2

70

L104

C2

71

L1

05

C272

L1

06

L1

07

C2

73

L1

08

L109L

11

0

L112

L113

IC200

L1

14

L115

IC4

00

R101

R1

02R103

R1

04

R1

05

R107

R1

08

D10

D11

R1

09

CF200

R111

R1

12

R1

13

R1

14

R115

R1

16

R119

R1

20

L1

R121

L2

L3

R124

L4

R319

L5

R1

25

R1

26

L6

R1

27

R1

28

L8

L9

R1

29

R320

R3

21

R322

R324

R1

30

R325

R327

R328

R329

L1

0

L11

L1

3

R330

C101

R3

31

C102

R332

R3

33

C1

04

R3

34

C105

TH

10

1

C1

06

C1

07

C108

C109

C110

IC1

C112

C113

C115

R10R11

R12

C3

16

C317

R1

4

C318

R1

5

C3

19

C1

25

C1

27

R18

R19C1

29

C320

C3

23

R20

C324

R3

61

C325

R2

1

C3

26

R22

C327

R23

C1

33C134

C328

R24

Q1

R25

C1

35

Q2

C136

R26

Q3

C137

R2

7

Q4

C138

R28

R3

69

Q5

C139

Q6

Q7

C3

30

C331

C1

40

R30

C141

R31R32

R33

C1

44

R3

4

C146

R2

R36

C147

R3

7

R3

C148

R4

R3

8

R5

R3

9

R6

R7

R8

R9

C150

R4

0

R4

1

C345

C1

51

R382

C152

C347 R3

83

R4

3

C153C154

R3

85

C155

R4

5

C1

56

R4

6

R386

C1

57

R47

R387

R3

88

R48

C1

59

C1

60

D1

01

C161

D1

02

C162

D1

03

C357

Q2

00

D104

Q201

Q2

02

Q203

Q204

C3

61

Q401

Q4

02

Q403

Q404

L2

00

L2

01

L202

L204

L205

L206

L2

09

L2

11

L2

13

L214

L2

15

IC302

C382

L2

17

IC303

C3

84

C3

85

C386

X1

C10 C1

1C

12

C13

R200

R2

01

C15

C16

R203

C17

R204

C18

R2

05

C19

R206

R207

R208

R3

5

R326

S418

PTTMONI

VR300

S419 J301

J300

+

1

45

8

1

45

8

1 458

G D

SG

1 89

16

18

9 16

GD

G D

SG

BE

EC

GD S

GD

S

+

+

+

+

J79-0325-09

D1

05

TH-K20A/K20E PC BOARD PC BOARD TH-K20A/K20E

Component side

Foil side

Layer 1

Layer 2

Layer 3

Layer 4

Ref. No. Address

IC1 8Q

IC200 8M

Ref. No. Address

Q7 9Q

Q101 4N

Q102 3N

Q200 8M

Q201 9O

Q202 8N

Q203 6M

Q204 6J

Ref. No. Address

Q401 9J

Q402 8J

D1 5P

D2 5P

D3 6P

D4 5Q

D5 5Q

D6 5P

D7 4P

Ref. No. Address

D101 4F

D102 4F

D103 4G

D200 6K

D201 6K

D203 5I

D204 6L

Ref. No. Address

Q1 6Q

Q2 4P

Q3 5Q

Q4 4Q

Q5 3Q

Q6 8R

IC302 6G

IC303 7F

IC400 8I

Q103 4L

Q104 4N

Q307 4O

Q403 8C

Q404 7C

D8 3P

D9 5R

D10 6R

D11 6Q

D104 5H

Ref. No. Address

D401 8J



D105 4G

-t

-t

MIC

SP

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SE

G3

0

SE

G2

9

SE

G2

8

SE

G2

7

SE

G2

6

SE

G2

5

SE

G2

4

SE

G2

3

SE

G2

2

SE

G2

1

SE

G2

0

SE

G1

9

SE

G1

8

SE

G1

7

SE

G1

6

LEDG

LEDR

SE

G3

1

LAMP COM2

COM0

COM3

COM1

LAMP

KEYO2

KEYO4

KEYO1

KEYI1

KEYI2

KEYIT

KEYI3

KEYI4

ENC2

KEYO3

KEYO4

KEYO3

KEYO2

KEYO1

KEYI1

KEYI2

KEYI3

KEYI4

KEYIT

KEYIS

MO

NI

LE

DG

LE

DR

EN

C2

EN

C1

ENC1

R1

26

27

0

C3

54

10

00

p

C1

12

0.0

1u

L2

05

12

0n

C3

42

10

00

p

R218

1k

C218

5p

C1

48

10

00

p

R2

06

33

0k

R358

47k

R324

560

C4

7

4p

C3

01

0.1

u

C2

29

5p

C1

08

15

p

C2

12

0.0

33

u

C27

47p

C3

47

10

00

p

C339

10p

R305

10k

C2

05

0.1

u

R3

18

2.7

k

C4

9

10

00

p

RFM01U7PQ102

R2

3

10

C217

0.01u

C230

10p

R1

11

82

k

C51

22p

C1

09

R3

41

0

C134

1000p

R2

00

47

Q301LTC044EEBFS8

C209

47p

D302

RB521S-30

1000p

C1

47

1u

R347

47k

F300

3.15A

R2

03

68

k

C113

56p

C3

14

0.0

1u

R214

330k

R1

02

C2

5

10

00

p

CD200

C138

6p

C3

2

10

00

p

C2

32

10

0p

R315

560k

R4

40

47

k

R2

8

82

0

R1

28

27

0

R2

1

C3

44

27

0p

C3

41

0.0

1u

C2

14

0.1

u

L204

22n

L1

1

82

n

IC301NJM12904RB1

1

2

3

4GND

5

6

7

8V+

10

00

p

C4

11

12

p

R335

10k

R3

23

1k

C2

16

22

p

D3

01

GN

1G

R3

34

47

k

C1

15

R3

60

1.8

k

C1

41

12

p

C45

22p

R220

680

D1

03

RN

14

2S

R1

13

R3

72

47

k

MIC300

1

2

L112

9T

C2

21

0.0

1u

C3

69

0.0

47

u

R1

9

5.6

k

RD07MUS2BT112

Q103

IC2

00

TA

31

13

6F

MG

1O

SC

IN

OS

Co

UT

MIX

oU

T

VC

C

IFIN

DE

C

FIL

oU

T

8F

ILIN

9

AF

oU

T

QU

AD

IFo

UT

RS

SI

NO

ISE

DE

T

NO

ISE

RE

C

GN

D1

6

MIX

IN

R3

14

82

0k

C1

57

C1

37

12

p

C357

100u 6.3

C3

64

1u

C2

19

22

p

R204

J300 1

311

102

C3

8

6.8

u1

0

2SC5636Q5

C2

01

10

00

p

C3

67

1u

C2

31

5p

R3

68

27

0k

C1

61

R363

1k

0.01u

R3

2

10

k

C1

05

R2

6

4.7

kS4

18

C2

03

27

0p

C4

21

10

00

p

C3

65

10

00

p

R3

16

10

k

C215

0.01u

C3

6

10

00

p

X1

19.2MHz

VCoNT

GNDoUTPUT

VCC

R351

100

R2

0

R1

15

56

k

R332

56k

R1

29

0.3

9

R3

46

27

0k

R3

67

33

0k

R3

17

3.9

k

R362

330k

R337

10k

C206

C1

62

C3

58

4.7

u

R3

09

5.6

k

R1

12

47

R27

2.2k

C4

4

10

00

p

C3

51

10

00

p

R359

330

C3

3

10

00

p

R1

21

39

k

R2

01

1.5

k

C1

53

10

00

p

R1

25

0.3

9

R300

R370

470k

C1

60

10

00

p

C2

26

8p

C337 0.01u

C1

10

C34

15p

C1

51

2.2

u

Q302LTC044EEBFS8

C2

20

10

00

p

CN304

C1

52

R216

180k

R1

05

33

0

C4

8

0.0

1u

C136

1000p

R2

5

C2

27

6p

C2

02

0.0

1u

R1

14

47

C3

23

33

00

p

R342

R2

13

47

IC304NJM12904RB1

1

4GND

5

8V+

C107

1000p

R365

2.2k

R4

22

1k

C101

22p

C5

0

5p

R1

27

0.3

9

CN303

R1

09

10

0k

C3

63

10

00

p

C3

10

0.1

u

C338

C2

11

0.1

u

R2

12

10

0

C140

6p

C1

39

27

p

R301

C1

44

XF200

R355

470

C207

L1

06

9T

C1

50

10

00

p

L9

12

0n

L1

08

2.2

u

R205 2.2k

R2

2

C2

04

18

00

p

2SC4926YD

Q101

R103

2.2k

R1

04

18

C1

04

10

00

p

R1

07

18

R1

30

0

R383

10k

R350

18k

C3

33

82

00

p

C2

08

0.1

u

C2

13

0.1

u

R3

03

10

k

R3

04

10

k

L1

03

10

0n

R354

1k

C353

0.047u

R345

82k

C3

08

0.1

u

R302 1k

C305

1u

L104

33n

R1

24

C1

55

10

00

p

C1

56

10

00

p

CN309

CN

31

0

CN

31

1

CN

31

2

C31

12p

IC1

MB15E03SL-E1

1

oSCIN

2

oSCoUT

3

VP

4

VCC

5

Do

6

GND

7

XFIN

8

FIN

9 CLoCK

10 DATA

11 LE

12 PS

13 ZC

14 LD/FoUT

15 P

16 R

C4

3

0.0

1u

R37

R36

R38

R3

5

R3

4

R3

3

R3

9

10

C4

1

0.0

1u

R3

0

10

k

C28

9p

L10

27n

C2

6

15

p

C2

9

15

p

C42

1000p

D9

DA

2S

10

1

R116

0

L107

6T

TH

10

1

B5

73

31

V2

10

4J

10

0k

C223

0.01u

R3

07

1M

R446

330

D427

B30-1779-05

R445

220

D426

B30-1782-05

IC308XC6209B502P-G

1NC

2VSS

3CE

4 VIN

5 VoUT

C3

75

1u

C3

77

R3

79

10

0k

0.0

1u

C4

24

C3

45

10

0p

C3

34

0.0

27

u

C3

36

82

0p

R338

10k

R3

36

10

k

J301 1342

D101

HVC131

D102

HVC131

D8

HSC277

D7

HSC277

C340

0.01u

R364

1k

C3

66

10

u

R3

77

47

k

SSM3J05FU-FQ308

R4

1

3.9

k

Q403RT1N144U-T111

Q404RT1N144U-T111

R4

43

10

0

C412

1p

C4

15

12

p

2SC4649(N,P)Q400

C414

1000p

C413

0.1u

R4

3

10

C46

R4

0

C3

56

10

u

C2

00

C4

02

X40011.0592MHz

D1

0

DA

2S

10

1

R4

5

33

k

2SC5383-T111Q7

R4

6

10

0k

R101

18

R331

56k

27

0p

C3

30

27

0p

R3

33

47

k

R120

1.8k

C1

59

2.2

u

C1

54

10

00

p

C1

46

18

p

R3

10

39

k

C3

07

0.2

2u

C306

1u

D300

KDR731

C228

0.01u

R221

330

R4

14

R4

05

C4

23

10

00

p

S4

17

R31

10k

R1

08

10

L1

01

68

n

C102

1000p

L110

9T

L109

9T

C2

33

10

00

p

R419

4.7k

CN305

IC307TA7368PL

1NC1

2VCC

3NC2

4VIN

5RIPPLE6 NF

7 PHASE

8 PRE-GND

9 PW-GND

10 PoUT

C373

CN

30

7

CN403

CN400

CN401

CN402

C324

0.18u

C320

0.18u

R3

30

10

0k

R326

5.6k

R325

470

IC302

NJM12904RB1

1AoUT

2A-IN

3A+IN

4GND5 B+IN

6 B-IN

7 BoUT

8 V+

C318

0.18u

C3

16

0.1

8u

R321

2.2k

IC303

NJM12904RB1

1

2

3

4GND

5

6

7

8 V+

R320

56k

R319

180

C3

22

0.3

9u

C1

06

9p

L1

05

82

n

R4

15

R2

37

47

0

R2

38

R2

41

CN202

L2

06

82

0n

R2

31

C2

49

39

p

C2

54

10

00

p

R2

29

R2

28

1k

L2

09

C2

61

39

p

C265

47p

C2

46

39

p

C2

35

C248

1p

C2

59

10

00

p

C2

47

10

00

pD

20

1

HV

C3

50

B

D2

00

HV

C3

50

B

C256

47p

R2

40

C2

45

2p

C244

1000p

R2

30

D2

03

HV

C3

50

B

3SK318Q203

R2

39

3SK318Q204

C2

55

C2

50

2p

R2

43

1M

C2

53

R236

82

R4

25

47

0k

R424

1k

C3

17

0.1

u

C3

25

0.1

u

C372

10u

R2

35

47

L2

01

56

0n

L2

00

56

0n

KTC4080E-P

Q201

KTC4080E-P

Q202

L2

02

82

0n

CN

30

8

2SK3577-A

Q303

R3

74

10

k

SSM6J08FU(F)Q306

C3

83

10

00

p

C3

84

10

00

p

CN

30

6

R2

25

47

C2

34

0.0

1u

C2

40

10

00

p

SSM3J05FU-F

Q304

2SK3577-AQ305

R2

4

3.3

k

IC306

XC6209B502P-G

1 NC

2 VSS

3 CE

4VIN

5VoUT

C3

76

R3

39

1k

R119

0

C3

80

10

00

p C3

82

27

0p C

38

5

10

00

p

R3

40

1k

C3

35

27

0p

C3

13

0.1

u

R3

82

8.2

k

R308

1k

C3

02

0.1

u

C3

9

0.6

8u

20

C3

26

18

0p

R329

330k

R327

100k

R328

10k

F301

0.315A

F1

01

R2

15

0

VR300

C304

0.047u

R2

08

18

k

R210

68k

R353

10k

R361

47k

D4

18

D4

19

R4

48

1.2

k

D4

14

B30-2261-05

D4

15

R4

44

22

0

R4

47

1.2

k

D4

20

R4

42

33

0

R4

49

1.2

k

D4

16

B30-2337-05

D4

21

D4

17

D4

01

DZ

2S

03

6(0

)

C4

17

10

00

p

2SC4617(R)Q402

C4

19

10

u

12A02CHQ401

R437

3.3k

C4

20

10

00

p

R4

38

68

0

R4

39

33

kC4

18

10

00

p

IC401

R5F2L3ACCKEKA

1 2 3 4 5 6 7 8 9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

CO

M0

CO

M1

CO

M2

CO

M3

SE

G0

SE

G1

SE

G2

SE

G3

SE

G4

SE

G5

SE

G6

SE

G7

SE

G8

SE

G9

SE

G1

0

SE

G1

1

SE

G1

2

SE

G1

3

SE

G1

4

SE

G1

5

SE

G1

6

SE

G1

7

SE

G1

8

SE

G1

9

SE

G2

0

SE

G2

1

SE

G2

2

SE

G2

3

SE

G2

4

SE

G2

5

SE

G2

6

SE

G2

7

SE

G2

8

SE

G2

9

SE

G3

0

SE

G3

1

S419

CB

A

R4

00

22

0k

R4

03

22

0k

R4

01

22

0k

CF200

C3

21

0.1

8u

C4

04

C4

05

C4

06

C4

07

R2

07

2.7

k

CN300

1

2

R3

87

33

k

C319

0.18u

D4

23

D4

22

D4

25

R4

50

1.2

k

R4

51

1.2

k

D4

24

C266

3p

R2

46

10

0k

R226

0

R2

47

3.3

k

C2

39

R2

27

33

0

C2

37

22

p

R232

0

C2

51

10

00

p

R2

48

1.5

k

C1

27

C1

25

C1

33

L114

5T

L113

3T

C5

R3

1k

R4

15k

C2

0.033u

C3

1u

C7

0.5

p

D4

HV

C3

50

B

R5

1k

R2

2.7

k

D3

HS

C2

77

R6

10

0k

R8

10

k

R7

10

0k

R9

100k

C9

1u

C1

0

8p

L6

10u

C1

2

1u

6.3

D5

HV

C3

50

B

C1

5

10

p

C1

7

9p

MCH3914(7)-HQ3

C1

9

0.0

1u

R10

22

C2

0

10

00

p

2SC5108(Y)FQ4

C22

0.5p

C1

8

R1

1

4.7

k

D6

DA

2S

10

1

C1

6

22

u1

0

C1

3

10

00

p

2SC5383-T111Q2

R1

4

1k

C2

3

10

00

p

R4

53

10

0k

R4

52

10

0k

R4

64

27

k

R4

02

R249

1k

TH200NCP18WM474J0S

L1

220n

C6

0.022u

L4

27

n

C1

0.1

8u

R3

88

1k

R3

86

82

k

R385

1k

R322

3.3k

R376

0

L2

18

0n

R1

2

22

0

L8

C3

7

0.1

5u

L2

17

D2

04

HV

C3

50

B

C273

1p

C2

71

39

p

C2

70

1p

C4

0.0

22

u

C8

10

00

p

C1

1

10

00

pR

18

0

Q1LTC014EEBFS8

Q104LTC014EEBFS8

Q6

LTC014EEBFS8

R4

65

47

k

CP1

IC300R2A20178NP2

1VIN2

2VDD

3LD

4CLK

5DI

6VIN3

7

Vo

UT

38

Vo

UT

4

9V

IN4

10

VIN

5

11

Vo

UT

5

12

Vo

UT

6 13VIN6

14VDAREF1

15VDAREF2

16RESET

17GND

18VIN7

19

Vo

UT

7

20

Vo

UT

8

21

VIN

8

22

VIN

1

23

Vo

UT

1

24

Vo

UT

2

C359

0.01u

S412

D409

D405

1SS388F

S409

D406

1SS388F

S406

S415 D411

DA2S101

S413

S411

S407

S410

S408

D410

DA2S101

S405

D404

1SS388F

S414

D408

D407

1SS388F

C2

1

10

00

p

R4

7

R15 47k

D1

1S

V3

25

F

D2

1SV325F

S416

R466

Q200LTA023JEBFS8

Q300LTA023JEBFS8

Q307LTA023JEBFS8

D1

04

RN

14

2S

R2

51

1M

R2

33

R2

34

L2

11

L2

13

68

n1

8n

R3

12

47

k

R3

89

15

k

R3

11

47

k

R3

13

47

k

C3

32

1u

C3

61

0.2

2u

C3

60

0.2

2u

C3

79

22

0p

R3

78

27

k

C381

0.1u

IC305

XC6120N302N-G

1N

C

2V

SS

4

VIN

3

Vo

UT

L215

2.7n

D3

04

RB

52

1S

-30

R3

80

2.2

R252

4.7k

R253

4.7k

C3

86

0.0

47

u

L3

10u

L5

22

n

C3

29

2.2

u

C3

27

47

00

pC

32

8

0.0

1u

C3

11

0.0

27

u

C3

12

47

00

p

C1

29

C1

35

6p

L115

6T

IC400EX25064ATA00A

1 S

2 Q

3 W

4 VSS 5D

6C

7HoLD

8VCC

R4

41

10

0

R4

70

47

K

L13

4.7n

R48

1k

D11

DA2S101

R3

66

0

D3

05

DZ

2S

06

8(M

)

R357

560

C3

71

0.0

27

u

C272

3p

R369

0

R431

R433

R432

EEPROM

CN2

-

T0

5MS

VO

L O

UT

+

RESET

PTT

PTT/RXD

MIC AMP/LIMITER

MICIM

TXD/REMSPK

5MS

AFO

5M

5MSC

SP MUTE SW

BATT-

BATT+

5R

SPM

450kHz

1st IF(38.85MHz)FM IF

IF AMP

Temp compensation

EXPTT

TXD

+

RXD

5MS

+

+

-

-

SPG

5MS

BATTERYTERMINAL

-

FINAL

DRIVE

D/A CONVERTER

REG

5M

SB

5T

5C

5R

PL

LE

N

DA

TA

SB

+B

SB

5R

+B

SPK

SPG

+B

SB

DAT

CLK

MONI

MOD

VCO

RESET

5M

GND

MODE

AF POWER AMPSPG

-

QT/DQT FILTER

-

+

+

MIXER

KEY BACKLIGHT

CLK

DAT

REM

REM

E2PCS

5VC

KE

YIT

KE

YIS

HS

DO

LS

DO

WK

UP

O

VR

EF

MO

DE

XC

IN

XC

OU

T

RE

SE

T

XO

UT

VS

S

XIN

VC

C

BS

FT

INP

TT

5R

C

EN

C2

EN

C1

RxD

TxD

PL

LE

N

PL

LP

S

PL

LL

D

NC

5TC

5C

C

COM0

COM1

COM2

COM3

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SE

G1

6

SE

G1

7

SE

G1

8

SE

G1

9

SE

G2

0

SE

G2

1

SE

G2

2

SE

G2

3

SE

G2

4

SE

G2

5

SE

G2

6

SE

G2

7

SE

G2

8

SE

G2

9

SE

G3

0

SE

G3

1

LE

DR

LE

DG

5V

C

5M

SC

MO

NI

CL

K

DA

TA

E2PIN

E2PCS

VOLCS

VDCSW

CURRENT

VOX

REM

BATT

THERM

RSSI

SQL

LSDI

CVDET

KEYO4

KEYO3

KEYO2

VL1

VL2

VL3

SHIFT

KEYO1

VL4

KEYI1

KEYI2

KEYI3

KEYI4

5M

SC

CL

K

CL

K

DA

T

HSDO

5V

C

SP

M

5R

C

LAMP

W/N

W/N

E2PIN

E2

PIN

E2

PC

S

SHIFT

PTT

5C

C

0

D

9

6

#

8

A

42

C

1

B

3

75

SP

M

5T

0-11

0-20

2-71

MONI

LCD

10

00

p

270p

10

u

10

k

C3

52

4.7

u

1u

0

M

E

K

X57-8210-XX

0-20

0-11

2-71

0

R431

0

NO 0

R432

NO

NO

R433

NO

NO

S401 S402 S403 S404

D414,D415 D416-D425

INT SP

+

-

+B

0.0

1u

C4

25

C3

31

C427

C428

10

00

p

22

u

22

u

22

u

22

u4

.7k

4.7

k

4.7

k

4.7

k

39p

10

00

p

3.3

k

33

0

3.3

k

1000p

56

10k

10k

10k

10

k

10

k

10

k

1M

560k

1000p

1k

1k

0.1

u

10

00

p

47

p

15

p

27

p

39

p

10

00

p

10

00

p

68

k

10

00

p

0.0

1u

10

00

p

1k

82

n

82

n

1M

1M

82

n

270p

10

u

10

00

p

10

00

p

82

k

82

k

82

k

L2

14

33

0

10

00

p

18

0k

10

00

p

39

0k

10

0k

10

0k

22

p

100p

NO

D408 D409

DA2S101

DA2S101

DA2S101

DA2S101

NO

NO

ANT

ANT SW

D101,102,103,104

VDC SW

RF AMP

BPF TUNING

BPF TUNING

D200,201,204

DOUBLER

SYSTEM

W/N SW

PRI DRIVE

TX/RX SW

RF AMP

RF BUFFER

FREQUENCYCONTROL

D1,2

MODULATOR

D4

TX/RX SW

Q1

RIPPLE FILTER

CURRENTSTEERING

D11

PLL SYSTEM

DC SW

VOLTAGEREGULATOR/3V

TCXO

LSD BUFFER

AF FILTER

CURRENTSTEERING

DC SW

SWITCH

MCU

LEDGREEN

LEDRED

DC SW

DC SW

DC SWDC SW

VOLTAGEREGULATOR/5V

DC SW

DC SW

DC SW

VOLTAGEDETECTOR/RESET

VOLTAGEREGULATOR/5V

PROTECT

POWER SW/AF VOLIUM

OVER VOLTAGELIMITTER

LED SWITCH

BACKLIGHT

CONTROL

SWITCH


D304



D404-407

Key matrix

D408-D411

SURGEABSORPTION

BACKLIGHT

DC SW

RF SWITCH

D3 D5

FREQUENCYCONTROL

SPEED UP

D6

D7,8

5MS

5MS

5MSC

RESET RESET

SPM

5MSC

SPM

5CC5CC

5TC5TC

REMREM

5MS

INPTTINPTT

RXD

EXPTT

REM

TXD

EXPTT

RXD

TXD

5CC

5TC

5RC5RC

5RC

5M

+B

SB

5M

+B

SB

5C 5C

5C

5C 5C

+B

+B +B

5R 5R

5R 5R 5R 5R

5T 5T

5T 5T 5T 5T5T

5R

5T

+B

+B

5C

5MS

5MS

5C

5R

5R

W/N W/N

RSSIRSSI RSSI RSSI RSSI RSSI RSSI RSSI

5T

SQL SQL SQL SQL

W/NW/NW/N

SQL SQL SQL SQL

CURRENTCURRENTCURRENT

CURRENTCURRENT

THERM THERM THERMSHIFT SHIFT SHIFT

THERM THERM THERM

CURRENT

VDCSW VDCSW VDCSW

VDCSW VDCSW

5MS

5MS 5MS

5MS

PLLLD PLLD

PLPS PLPS

CLK

DAT

CLKDAT

PLLE PLLE

LSDI LSDI LSDI LSDI

VOLCS

VOLCS VOLCS

VDCSW

5MS

DAT

VOX

LSDI

CLK

5VC

THERM

SHIFT

CURRENT

LSDO LSDO LSDO

CVDET CVDET CVDET

VOX VOX

5VC 5VC

BPF

BPFBPFBPF

POWC POWC POWC

POWC

VDCSW

TX-RX UNIT(X57-821X-XX)

L77-3074-05

L79-1474-05

L71-0669-05

0.5

A

32V

L77-2974-05

3.3k

D401

SPEED UPVCO

TCXO OUT TCXO OUT

EX

CV

EXPTT EXPTT

INT MICINT MICINT MIC

ENC

+B

GNDGND

RXLO

TCXO OUT

RXLO RXLO

INPTT

SB

LCD BACKLIGHT

C374

0.056u

D1

05

RN

14

2S

L72-1042-05

R: 0VT:0.81V

R: 0VT:4.93V

Hi:1.48V

Lo:1.21V

Hi:3.25V

Lo:2.63V

Hi:1.49V

Lo:1.21V

R:4.98VT: 0V

7.5V

R:3.11VT: 1.03V

R:3.85VT: 1.26V

R:4.88VT: 1.59V

R:0.61VT: 0.59V

R:4.68VT: 1.53V

R:4.88VT: 1.59V

R:0.72VT: 0.71V

R: 0VT:4.32V

R: 0VT:1.09V

R: 0VT:4.91V

R:0VT:0.61V

1.80V

R:1.03VT:1.74V

5.0V

R:4.88VT: 1.59V

0.70V

4.15V

4.98V

2.90V

R:4.89VT: 1.59V

R:1.80VT:1.81V

7.5V

5.01V

ON:7.49VOFF: 0.33V

AF AMP

AF AMP ON:3.30VOFF: 0.51V

AF AMP ON:4.99VOFF: 0V

R:4.89VT: 1.59V

7.5V

5.01V

5.0V

R:2.68V

T: 0.89V

R:2.44VT: 0V

Mid:1.27V

Mid:2.78V

Mid:1.28V

W:0VN:5.01V

7.51V

OFF:0.40VON:5.57V

OFF:0VON:4.98V

OFF:0VON:5.02V

ON:2.75VOFF: 0V

ON:5.0VGREEN LED

ON:5.0VRED LED

2SC5383-T111

IC400

IC307

IF SYSTEM

AVR

38.85MHz

Q1

AMP

BR255640FV1-W

ANTBUFF

XF200

Q101

D103-D105RN1425

450kHz

BPF

TA7368FG

MCU

Q4CLK

FILTERANT SW

RF

HVC350B

PLL SYSTEM

3SK318

IC306

5RCURRENT

LCD/KEY BACKLIGHT

Q202

MIXER

Q203

FILTER

2SC4926YD2SC5108(Y)F

HVC350BD203

TX/RX

Q2

5R

SW

38.4MHz

Q204

MUTESW

Q201

IC304

XC6209B502P-G

TUNE

SHIFT

EEPROM

5R

TUNE

R5F2L3ACCKEKA

BPF

2SK3577-A

AMP

CF200

Q3

FINAL

5T

DRIVE

IC1

AF POWER AMP

D200,D201,D204

IC401

MCF

D101,D102HVC131

MB15A02PFV2E1

RIPPLE

5T

LD

KTC4080E-P

DOUBLER

DAT

LOOP

THREM

5C

RFM01U7P

5R

SP

Q102

1st Local frequency174.850~212.845MHz(K,M,E)

VCO oscillation frequencyRX: 174.850~212.845MHz(K,M,E)

TX: 136.000~173.995MHz (M) 144.000~147.995MHz (K)

RX: 136.000~173.995MHz (K,M,E)

144.000~145.995MHz (E)

TX: 136.000~173.995MHz (M) 144.000~147.995MHz (K)

SW

RF BPF

IF

5C

HSC277

EXT

19.2MHz

3SK318

5V

VCO

RF BPF

5R

PLLEPLPS

TX-RX UNIT (X57-821x-xx )

MCH3914(7)-H

CLK

X1

IC200

DC SW

SSM6J08FU(F)

Q306

RSSISQL

MIC AMP

TA31136FMG

AMP

PREDRIVE

D7,D8

AMPRSSI

SSM3J05FU-F

V REF/

L77-1944-05

L71-0669-05

L72-1042-05

5TLSDO

TCXO

11.0592MHzL78-2974-05

X400

2SC4617(R)Q402

D414,D415 B30-2261-05

12A02CHQ401

LAMP

XINXOUT

+B

5VC

DC SW

Q200

TH101

DA2S101D6D3

HSC277

5C

KTC4080E-PSQL

LTA023JEBFS8

5M

IC301NJM12904RB1

LIMITER

MIC AMP

5C

CONV.D/A

5MS

CONV.D/A

FILTERAF

IC303NJM12904RB1

LSDI

SWBSFT

Q4002SC4919-S

WID/NAR

RESETEXPTT

BATT

LEDG

INPTT

E2PINE2PCS

LEDRPLLEDATCLK

ENC2ENC1

5MSC

5RC5TC

5CC

PLLD

LSDI

5M

2nd Local

19.2MHz

Q5

2SC5636

RFAMP

RD07MUS2BT112Q103

AMP

SHIFT

LPF

CD

CD200L79-1474-05

LTC014EEBFS8

5C

MICINT

SP

MUTESW

SB

Q303

MUTESW

Q305

LTC044EEBFS8

F301

Q302

SPM

Q301

INT

2SK3577-A

DC SWDC SW

D1,D21SV325F

D4HVC350B

MOD

CONV.D/A

D5HVC350B

ASSIST

144.000~145.995MHz (E)

LTC044EEBFS8

0.315A

VOLOUT

MIC

SPGTXDSPKAFO

PTT/RXDMICIM

5MS

J301E11-0717-05

J300E11-0484-05

MIC300T91-0673-05

D/A

IC300(1/8)

CONV.

R2A20178NP

IC300(5/8)R2A20178NP

IC300(6/8)

R2A20178NP

IC300(3/8)R2A20178NP

IC300(2/8)R2A20178NP

NJM12904RB1

DC SW

5MS

FILTER

QT/DQT

IC302NJM12904RB1

CN300

AFO

CONV.D/A

VOX DETVOX

MOD

D300KDR731

Q6

INVERTLTC014EEBFS8 PLLD

VOLIN

5MS

FREQ

CONV.D/A

5MS

BPF

CONV.D/A

5MS

POWC

VDC SW

Q104

LTC014EEBFS8

VDCSW

F101

0.5A

IC300(7/8)R2A20178NP

IC300(8/8)R2A20178NP

-t

CURRENT

THREM

5MS

B30-1782-05

Q403

D426

(GRN)

LEDGLTC014EEBFS8

LTC014EEBFS8

5MS

DCSW

B30-1779-05

Q404

D427

(RED)

LEDR

3.3VREGQ7

2SC5383-T111DCSW

DCSW DCSW

SB

DATA

PROTECT

SB

D301GN1G

BATT+7.5V

VOLIN

+B

VR300R31-0684-05

PROTECT

D302RB521S-30

VOLOUT

BATT-

F300

3.15A SB

RESET

IC305XC6120N302N-G

RESET

Q304

5MS

5MSC

5M

DC SW

LTA023JEBFS8Q307

5R

5RC

HSDO

HSDO

S419W02-3766-05

ENC1

LCD B38-0939-05

D416~D425 B30-2337-05

COM0~COM3,SEG0~SEG31

KEY MATRIX

LTA023JEBFS8

Q300

5MS

5MS

WIID/NARVDCSW

HSDO

MATRIX

DC SW

D404~D4071SS388D408~D411MA2S111-F

DIODE

AVR

IC308XC6209B502P-G

5VPROTECT

D304RB521S-30 SSM3J05FU-F

Q308

5T

5TC

5C

5CC

DC SW

BATT

VOX

SPM

ENC2

INPTT

MON

S418

S417

KEYI1~KEYI4,KEYIS,KEYIT

KEYO1~KEYO4

5R

MICEXT

5MS

EXPTT

MON

ENC

VOL/PSW

PTT

MONI

TX

BUSY

SERVICE MANUALNo part of this manual may be reproduced, translated, distributed, or transmitted in...

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Transcript of SERVICE MANUALNo part of this manual may be reproduced, translated, distributed, or transmitted in...