Fm8700 Sme A

MARINE VHF RADIOTELEPHONE

MODEL FM-8700

F I R S T E D I T I O N : A U G 1 9 9 8

Yo u r L o c a l A g e n t / D e a l e rFURUNO E L E C T R I C C O., LT D.c

9 - 5 2 , A s h i h a r a - c h o ,N i s h i n o m i y a , J a p a n 6 6 2

Te l e p h o n e : 0 7 9 8 - 6 5 - 2 1 1 1Te l e f a x : 0 7 9 8 - 6 5 - 4 2 0 0

A l l r i g h t s r e s e r v e d . Printed in Japan

P U B . N o . S M E - 5 6 1 7 0 - AF M - 8 7 0 0( K A O K )

CONTENTS

Chapter 1 BLOCK DESCRIPTION

1.1 General 1-1

1.2 Input/output data format of FM-8700 1-2

1.3 DX-8700 input/output signals 1-4

1.4 Main function of PC boards 1-6

1.5 Block description 1-9

1. DX-8700 antenna system 1-9

2. DSC Receiver section 1-10

3. Transmitter section 1-11

4. Receiver section 1-13

5. Controller section 1-15

6. Power supply section 1-19

7. IF-8500 (Printer interface) 1-20

Chapter 2 Location of Parts

1. Control Panel 2-1

2. Rear Panel 2-1

3. Bottom View, Cover removed 2-2

4. CONTROL Board 2-2

5. Bottom View (CONTROL Board and the removed) 2-3

6. Panel 2-3

7. Duplexer (DX-8700) 2-4

Chapter 3 Change of System Setting

3.1 Outline of system setting 3-1

3.2 Change operation to normal mode or test mode 3-2

3.3 Change of system setting 3-4

1. Setting DSC (Selection of receiver) 3-4

2. Setting RT (Function of VHF section) 3-6

3. Setting CH (Channel presetting) 3-8

4. Setting PO (Setting transmitting power) 3-10

5. Setting L (Selection LCD display, Japanese and English) 3-12

3.4 Change of jumper setting 3-13

3.5 Confirmation of ID number 3-14

3.6 Changing ID number and ON/OFF of Private mode 3-15

Chapter 4 Adjustment and Measurement

4.1 Transmitting frequency and power 4-1

4.2 Measurements on CH70 4-2

1. Mode change 4-3

4.3 Other measurements 4-6

1. Confirmation of receiver sensitivity 4-6

2. Confirmation of transmitting modulation degree 4-7

3. Confirmation of receiving sensitivity of CH70 RX board 4-8

Chapter 5 Maintenance check

5.1 Periodical check 5-1

1. Cleaning of display portion 5-1

2. Check of loose connectors 5-1

3. Antenna 5-1

5.2 Everyday oprational test (Self-test) 5-2

5.3 Exchanging the nickel-cadmium battery 5-5

5.4 Exchanging ROM 5-6

5.5 About NMI switch 5-8

Chapter 6 Troubleshooting

6.1 Functional tests 6-1

1. RAM/ROM test 6-2

2. Remote line test 6-3

3. Keyboard test 6-4

4. Display (LCD) test 6-4

5. Printer test 6-5

6.2 Error messages 6-6

1. CPU communication errors 6-6

6.3 Confirmation by line monitor 6-7

6.4 Guidelines for troubleshooting 6-8

6.5 Board compatibility 6-11

Specifications AP1-1

Private Channel List AP2-1

Mechanical Parts List M-1

Schematic Diagrams S-1

1-1

1.1 General

FM-8700 is a full-duplex international VHF radio-telephone which includes a VHF DSCfunction and a VHF watch receiver. The system consists of a transmitter- receiver unitand a duplexer unit, operating from DC 24 V (+30%, -10%) power supply.

External devices such as remote station (RB-700), distress message controller (DMC-5),printer, navigation device (outputs location and time data in NMEA format), winghandset, and external speaker can be connected to this system.

If a printer is used, a printer interface unit (IF-8500) is required.

The system connection diagram is shown below.

ANT CH70RXNavigation Device

Wing Handset (port)

Wing Handset (Starboard)

Handset Hanger (HSC701K-BX21)

EXT Speaker

Remote Station (RB-'700)

AC/DC Power supply unit (PR-300/240)

Distress Message Controller (DMC-5)

Printer Interface (IF-8500)

DX-8700

TX ANT RX ANT NMEA

POWER

DMC

PRINTER

REMOTE

EXT SPKR

HANDSET

FM-8700

W-HANDSET

NMEA

W-HANDSET

Printer

DC24V + 30 , -10% (7A MAX)

DC24V + 30 , -10% (7A MAX)

AC100/220VAC

* *

*

*

*

*

*

*

*

*

NOTE) DB-500 is required when additional RB-700(s) is connected.

*

Note) *:operational

Fig. 1-1 System Configuration

Chapter 1 BLOCK DESCRIPTION

OperationalPriority 1. DMC-5 2. FM-8700 3. RB-700

1-2

1.2 Input/output data format of FM-8700

The designation of connectors for the input-output signals and their electricalspecifications are shown below.

ðððð8P4P6P7P

16P

CH70 RX ANT (RX ANT)

ANT (TX ANT)REMOTE

HANDSET24V DC

NMEA DMC WING HANDSETPRINTERGND

1 2

EXT SPBREAKER

Fig.1-2 Layout of the connectors on the rear panel of FM-8700

Table 1-1/2

ConnectorName

Connectortype Pins Signal Remarks

TX ANT M-R type 50 Ω

RX ANT M-R type 50 Ω

1. +24V24V DC HS16R-2

2. –24V24V+30,-10%

1. 0V

2. PTT SW

3. MIC (H)

4. MIC (C)-46dBm (600 Ω)

5. HS SP (H) 0dBm (200 Ω)

Main Handset FM-10RS-6H

6. HOOK SW

1. 0V GND

2. W-PTT SW RS-410N Open collector

3.W-MIC -46dBm (600 Ω) or0dBm (40 Ω)

Part and starboardmicrophones areconnected in parallel.Microphone type,carbon or dynamicmust be selected onFM-8700.

4. W-SP 1mW (200 Ω)

5. T15V (TX)

6. +15V

7. DUP/SIMP RS-410N Open collector

Wing Handset FM214-7SM

8. 0V

1-3

Table 1-2/2

Terminal Connector Pin Description Signal Remarks

1. TXD (H)

2. TXD (C)NMEA

3. RXD (H)

4. RXD (C)NMEA

IEC1162-1(ZDA, GLL, RMC)

5. CH70RX (H)

6. CH70RX (C)0dBm (600 Ω)

NMEA FM214-7SM

7. POW

1. TXD (H)

2. TXD (C)

3. RXD (H)

4. RXD (C)

MIF

5. F-GND

DMC FM214-6SM

6. ALM

1. TXD (H)

2. TXD (C)

3. RXD (H)PRINTER FM214-4SM

4. RXD (C)

MIF

1. TXD (H)

2. TXD (C)

3. RXD (H)

4. RXD (C)

MIF

5. F-GND

6. 15V 1A MAX

7. NC

8. NC

9. 0V

10. LINE OUT (H)

11. LINE OUT (C)0dBm (600 Ω)

12. LINE IN (H)

13. LINE IN (C)0dBm (600 Ω)

14. TX KEY RS-410N Open collector

15. NC

REMOTE SRCN-16P

16. NC

1-4

1.3 DX-8700 input/output signals

The logout of the connectors on the DX-8700 and its specifications are shown below.

ANT

RX OUT

CH70 RX ANT NMEA

WING HANDSET

TX IN NMEA

WING HANDSET

FM-8700 Connectors~ ~

Fig.1-3 Connectors on DX-8700

Table 2-1/2

ConnectorName


ANT M-R type 50 Ω

CH70 RX ANT M-R type 50 Ω

TX IN M-P type 50 Ω

RX OUT M-P type 50 Ω

1. 0V Signal GND

2. W-PTTSW

3. W-MIC -46dBm (600 Ω) or0dBm (40 Ω)


4. W-SP 0dBm (200 Ω)

5. T15V (TX)

6. +15V

7. DUP/SIMP RS-410N Open collector

8. 0V Signal GND

Wing Handset FM14-7P

9. F-GND

1-5

Table 2-2/2

ConnectorName


1. 0V GND

2. W-PTT SW RS-410N Open collector

3. W-MIC-46dBm (600 Ω) or

0dBm (40 Ω)


4. W-SP 1mW (200 Ω)

5. F-GND

6. TXD (H)

7. TXD (C)

8. RXD (H)

9. RXD (C)

NMEAIEC1162-1(ZDA, GLL, RMC)

Wing HandsetTerminal

Board

10. F-GND

1. TXD (H)

2. TXD (C)

3. RXD (H)

4. RXD (C)

NMEA IEC1162-1(ZDA, GLL, RMC)

5. CH70 RX (H)

6. CH70 RX (C)0dBm (600 Ω)

7. POW

NMEA FM14-8P

8. F-GND

1-6

1.4 Main functions of PC-boards

The system block diagram of FM-8700 and DX-8700 is shown in Fig.1-4. The mainfunctions of each PC-board are shown in Table 3 on the following pages.

FILTER PCB (05P0673)

POWER PCB (05P0617)

TX PCB (05P0618A)

CH70 RX PCB (05P0675)

DUPLEXER

PANEL PCB (05P615) * LCD/LED/KEY

CONTROL PCB (05P0616A)

RX PCB (05P0672)

(DC24V)

NMEAPRINT DATA

TB-1

PRINTER I/F (IF-8500)

PRINTER (PP-510)

DC24V

NBDP

VHF DSC

MF/HF DSC

WING HANDSET (Both wings, Parallel Connection)

ANT

CH70 RX ANT D-R

X

D-T

X

D-A

NT

TX

IN

RX

OU

T

NM

EA

W-H

AN

DS

ET

W

-MIC

, SP

, W-P

TT

,

+

15V

, DU

P/S

IMP

,TX

DMC-5

RB-700

24V DCNMEA DMCPRINTERWING HANDSETANTCH70RX ANT REMOTE HANDSET

HANDSET

T/R

D

T/R

D, A

LAR

M

T/R

D, +

15V

, LIN

E IN

/O

UT

, TX

KY

E

MIC

, SP

, PT

T S

W,

HO

OK

SW

+24

V

SW

Braker : 10A

+15V

AF VR SQ VR

MODE/CH SW

SP SWAUTO/SCAN /DW/OFF

RX Freq, CONT DATA

SQ DET/SIG

HS SP

TX Freq DATA

POWER CONT

MOD

TX

9V

9VEXT SP

INT SP

LINE OUT

POWER DET

+15

V

+15V

+15V (RX PCB)

+15V

DSC CPU : H8

VHF CPU : V25

MODEM FM-8700

DX-8700

TX OUT

RX OUTLINE MON

DUP/SIMP

TX

T/R

D, C

H70

RX

, P

OW

Fig.1-4 BLOCK DIAGRAM

1-7

FM-8700Main PC-boards of FM-8700 and their functions are shown in the table below.

Table 3-1/2

PC-boards Main functions and Circuits

TX(05P0618 A)

Contains circuits for transmitting modulator, local oscillator, power amplifier,and delivers 25/1W outputs every 25 kHz step at 155.0 - 156.475 MHz.1 A local oscillator circuit for transmission (synthesizer PLL)2 A reactance modulator (G3E, G2B) and its amplifier3 A transmission power amplifier and a transmission power controller

RX(05P0672)

Consists of a double-super heterodyne receiver circuit at 155.0 - 166.075 MHz,(receiving sensitivity; 20 dB, SINAD; less than 0 dB, first IF; 21.4 MHz, secondIF;455 kHz).1 First local oscillator circuit (synthesizer PLL: 21.4 MHz)2 Second local oscillator circuit (crystal-control; 20.945 MHz)3 Squelch circuit (controlled by carrier detection and sound detection)4 AF power amplifier circuit (8 Ω, 3W output with 10% distortion)

CONTROL(05P0616 A)

Includes CPU for VHF, CPU for DSC, MODEM, ROM, EEROM and I/O.VHF and remote control with VHF CPU (µPD70320GJ : V25)DSC function with DSC CPU (HD6475328CP : H8) and MODEMTX AF monitor control circuit and TX AF LINE input signal selection circuit

FILTER(05P0673) Consists of filter circuits for connected signal lines.

PANEL(05P0615)

1 LCD drive circuit (for DSC)2 LED drive circuit (for VHF)3 Keyboard circuit

FM-8700

POWER (05P0617)

Generates 15V output by series power supply circuit from DC 24V input.1 Over voltage protection: +32 V and low voltage detection: +20 V2 Temperature detection sensor mounted on U2* gradually decreases the transmitting power by detecting a temperature from 70 to 80 °C.

1-8

DX-8700Main PC-boards of DX-8700 and their functions are shown in the table below.

Table 3-2/2

PC-boards Main functions and Circuits

Duplexer(05P0674)

Consists of filters for duplex operation.1 Transmitting filter: BEF characteristics with three stagger cavities. (156.0 - 157.5 MHz, the power loss; less than 1.4 dB)2 Receiving filter: BEF characteristics by four stagger cavities. (160.6 - 162.1 MHz, the power loss; less than 1.6 dB)

DX-8700

CH70 RX (05P0675)

Consists of a double-super heterodyne receiver circuit used exclusively for non-intermittent listening to DSC CH70 (156.525 MHz).Receiving sensitivity; 20 dB,SINAD; less than 0 dB, the first IF; 16.9 MHz, the second IF; 455 kHz1 First local oscillator circuit (crystal-control; 139.625 MHz)2 Second local oscillator circuit (crystal-control; 16.455 MHz)3 DUP/SIMP switching circuit (relay control)4 Connecting terminals for WING HANDSET and NMEA5 Selection of receiving antenna for CH70 (by changing antenna wiring)

1-9

1.5 Block description

1. DX-8700 antenna system

Dup Simp

Dup Simp

Dup ANT

TR ANT

Simp

Dup

Dup TX

Dup RX

TX IN

Dup

lexe

r

C35DET

CR4

Buff

U1 (2/2)POW

Q3, 4

Q1, 2

Deviser

T1

K3

K1

K2

K4(CR1)

Tx Rx

RX OUT

CH70 RX

CH 70 ANT

J5 J6 CH 70 RX AF

TX level monitor signal

(DSC RX Signal)

TR ANT

CH70 RX ANT

+15V

DUP/SIPK1 K2 K3

DUP/SIP

W5

K4

TX

Q5

Fig.1-5 DX-8700 Antenna System

DX-8700 consists of CH70 RX board (05P0675) and Duplexer (05P0674). The CX70RX circuit contains an antenna switching circuit and CH70 RX circuit. K1 - K3 are relays.The antenna is selected by DUP/SIMP control signal from the main unit.

The transmitting signal output from the main unit is input to <TX IN> and switched byK4.

The TR ANT antenna can transmit/receive VHF signals and receive CH70 signal.

When a CH70 receiving antenna is used, <CH70 ANT> is internally connected to "CH70RX circuit, J6" with a coaxial cable.

1-10

2. DSC Receiver section

OSC

OSC

DET

Q11 FL1

156.525MHz

U3 Q12 FL2

16.9MHz

Q13

Y216.445MHz

FL3

455kHz

U4 (MC3361CD)

U2 (1/2)

34.90625MHzY1

×4

139.625MHz

(3SK302GR)

(GN2011)

(2SK937-Y5-AA) (3SK302GR) (NJM2094M)

Q14

Q15

(2SC3123)

C73

TP2

J6J5

W5

CH70 RX ANT

DEVISER

T1

S

D K3

RX OUT

Q1, 2

Q3 ,4

(2SK937-Y5-AA)

(2SK937-Y5-AA)

DUP RX

SIMP RX

CH70 RX

CH70 RX AF (0dBm 600 Ω)

CH70 RX (05P0675)

U30-2/4 U29 U2 (VHF)

U3 (DSC)

CPU

CPU

MODEMU31-2/4

PIO

CONTROL (05P0616A)

(H8 : HD6475328CP)

(V25: µPD70320GJ)

(NJM3403AV)

U14

(µPD71055GB)

CH70 1200

FM-8700

DX-8700

TR ANT

(2SC3123)

(MSM6927GS-2K)

TP1

Fig.1-6 CH-70 Receiving Signal Flow

The receiver for CH70 (156.525 MHz) is included in DX-8700.

CH70 signal is received by either of a dedicated receiving antenna (CH70 RX ANT) or atransmitting-receiving antenna (TR ANT). The internal circuit connection must bechanged in accordance with the equipped antenna.

The input signal from TR ANT (SIMP RX) is amplified by Q1 and Q2 (preamplifiers) soas to adjust it to the same level as the input from CH70 RX ANT.

The gain from Q1, 2 to J5 is more than 0 dB.

The input signal to CH70 RX circuit is amplified by Q11, passed through FL1 (156.525MHz), mixed with the 139.625MHz local oscillator output in U3, and converted to thefirst IF signal of 16.9 MHz. Then, after passing through Q12, FL2, and Q3, the signal isconverted to the second IF signal of 455 kHz by mixing with the 16.9MHz second localoscillator output, and input to CONTROL board in the main unit as CH70 RX AF signal.

This signal (VHF DSC signal) is decoded in the CONTROL board.

1-11

3. Transmitter sectionTransmitting AF circuit

U30-1/4

(DSC MSG)


Wing - MIC

MOD (-26dBm 600 Ω )

R154

R155

R156

R153

MIC

MODEM

REMOTET1

R127

C

DJP2

LINE MON

MIC SELECT

W HS

HS

DSC

REMOTE

MODEM

U 29

VHF CPU

U 2

DSC CPU

U 3

CONTROL. etc

TX PCB (05P0618A)

MOD IN

RX PCB (05P0672)LINE MON

J408-5

J404-7/8

FILTER PCB (05P0637)

Wing - MIC

MIC

REMOTE

-46dBm

0dBm

0dBm

(-46dBm)

U30-3/4U32-1/4

U32-3/4

U32-4/4

U32-2/4

U31-4/4

J406-3/4

J406-9/8J407-1/2

(600 Ω )

Note)

Note)

Operational Priority: 1. DSC call 2. Wing handset 3. FM-8700 4. REMOTE (RB-700)

(600 Ω )

• 0dBm: Carbon Microphone (40 Ω ) • -46dBm: Dynamic Microphone (600 Ω )

Fig.1-7 AF Signal in Transmitter

Audio signals from the wing handset, remote station (RB-700), and handset of the mainunit are input to CONTROL board through FILTER board.

Either carbon microphone or dynamic microphone can be used for the wing handset.When a microphone is installed, the jumper wire JP2 is set in accordance with thespecification of the microphone.

Transmitter VHF DSC messages are converted to AFSK (1700 ± 400 Hz) by U29(MODEM).

The audio signals and the AFSK signal are sent to TX board as <MOD IN> signalthrough analog switches in U32, R132 – 135, and U30.

The rated input level of the AF signal is -26 dBm (600 Ω).

1-12

Transmitting circuit

VCO

Pre-Emphasis

MIC

R79R78, C96 U6-1/4

Limitter

U6-2/4

(LPF)

U6-3, 4/4

MOD

R64

PLLU5

(PLL2001S)

Q5/6Q 7

Q1/2

DrivePA

M57710A

Power DET

LPF

U1U2-1/2, CR6

PWR DETPWR CONT

Q3, U2/7

PWR CONT

CR11(UNLOCK -- OFF)

Y1: 8.000MHz

C76

TX PLL Frq. DATA

MOD IN (-26dBm 600 Ω )

J101-1/2 TX OUT

U2: CPU

A/D

D/ATX PLL Frq. DATA(To TX PCB) (SCK, SDA, LE)

TX PLL LOCK DET

J102-1J102-1/3

(SCK, SDA, LE)J102-5

TX PLL LOCK DET

J102-6/7/8

TX PCB (05P0618A)

(To DX-8700)

From CONTROL PCB

From CONTROL PCB

From CONTROL PCB

(To CONTROL PCB)

PLL FIL


LD

FIN

Fig.1-8 Transmitter Circuit

AF signal from CONTROL board, <MOD IN> signal, passes through R79 (MIC), pre-emphasis (R78, C96), limiter, LPF, and R64 (MOD), then inputs to VCO.

R79 (MIC) adjusts the frequency deviation to ±3 kHz with a rated microphone input of -46 dBm.

R64 (MOD) adjusts the maximum frequency deviation to ±5 kHz or less for an excessivemicrophone input of –26 dBm.

The PLL circuit, consisting of U5, PLL FIL, and VCO (8 MHz reference oscillator) candeliver an output every 25 kHz step in a frequency range from 155.500 to 161.475 MHz.C76 adjusts the transmitting frequency deviation to ±300 Hz. (The specification is±10ppm.)

The AF signal is frequency-modulated (reactance modulation: G3E, G2B) by applyingthe signal to a variable capacitor diode in VCO. CR11, unlock detector of the PLL circuit,illuminates when the circuit is operating normally.

The output from the VCO is amplified by Q5, Q6, Q1, Q2, and a power module(M57710A) in U1 to approximately 25 W. The amplified signal then passes through LPFand comes out as the transmitting output from the main unit.

To control the transmitting power, a <PWR DET> signal is generated by detecting thetransmitting output and sent to CONTROL board. There, the signal is processed by VHFCPU to <POW CONT> signal, which controls the output of power module U1.

The transmitting output power is adjusted in power adjustment mode with six waves –CH60, 14, 88 of DUP and SIMP waves – and the respective power data is stored in thememory.

1-13

4. Receiver sectionReceiving circuit

OSC

DET

Q1 U1 Q2 FL1

21.4MHz

Q3

Y120.945MHz

FL2

455kHz

U2 (MC3361CD)

U4

8.000MHzY2

Fr-21.4MHz

(3SK302GR)

(GN2011)

(2SK937-Y5-AA) (3SK302GR)(NJM4558M)

VCO

Q6

C95

TP2

J9

RX (05P0672)

(2SC3123)

PLL

U10

(PLL2001S)

LOOP FIL Q4/5FIN

CR2

RX PLL Frq. DATA

(SC

K, S

DA

, LE

)

RX PLL LOCK DET LD

(UNLOCK- OFF)

(BPF) (BPF) Noise AMP

DET

SQ DET

LINE

R34

A

A U8

U5 SQ SIG

U6

U7

U7LINE OUT

HS SP

VOL OUT

LINE MON

AF VOL

U6 U9: AFP

(TDA2003H)

SP ONBEEP

U11

(M54972P)

SP ON

TX ON

DUP/SIMP

MUTE

MUTE

Q1Q2

Q3Q4

Q5Q6

Q7Q8

SDASCK

RXA

LINE MON

RX PLL LOCK DET

SCK, SDA, LE CONTROL (05P0616A)

EXT SP

Handset SP

SP

BEEP

BEEP MAX

LINE OUT

HS SP B

B

RX IN

SQ SIG

REMOTE

U8

TP3

U3/4CR1

U8 U8

R48

T2

Fig.1-9 Reciver Circuit

The receiver input signal from DX-8700 is input to J9 of RX board, amplified by Q1, andconverted to the first IF signal of 21.4 MHz in U1. CR2, unlock detecter of the PLLcircuit, illuminates when the PLL circuit is operating normally.

The first IF signal is passed through FL1 (21.4 MHz) and Q3, and input to U2(MC3361CD). In U2 the signal is converted to the second IF signal and demodulated.

R34 "LINE" adjusts the output from U2 so that the output level from U4 at TP3 becomes0.2 Vrms when a receiving signal of 60 dBµ with 1 kHz modulation and ∆f of 3 kHzcomes in.

<SQ DET> signal from U3 is used for detecting the carrier for SQ control and <SQ SIG>signal from U5 is for detecting the audio signal for SQ control. Both signals are input toCPU for VHF (U2) on CONTROL board. The SQ control is operated by controlling U8with <MUTE> signal.

References)• Built-in speaker : 3 W (10% distortion), 8 Ω• Handset speaker : 2 mW (10% distortion), 200 Ω• Sensitivity : less than 0 dBµ (20 dB SINAD)• Squelch tight level : less than -6 dBµ

1-14

Receiving AF circuit

W-MIC

MIC

MODEM

REMOTE

U30-3/4

LINE MON

U2

DSC CPU

U3

SQ DET

RX PLL LOCK DET

SCK, SDA, LE

BEEP

BEEP MAX

SQ SIG

SQ VOL

U30

SQ SET

VHF CPU

MODEM

U29TX/RX

RT1200

CH70 1200

CH70 RX AF

LOOP

U30-2/4

U30-1/4LINE MON

RX (05P0672)

CONTROL (05P0616A)

RXA

RXA

LINE MON

CH70 RX (05P0675)

MOD IN TX (05P0618A)

U31-2/4

U31

-1/4

U31-4/4

(T/RD 05)

R1

U31-3/4

U32-3/4

DSC

Fig.1-10 AF Signal in Receiver

AF signal "RXA" from RX board is input to an analog switch U31-2/4 and "CH70 RXAF" signal from CH70 RX board is input to another analog switch U31-3/4.

When <Watch VHF CH70> appears on the DSC display, the control signal "CH70 1200"selects a DSC AF signal from CH70 RX board by switching the U31-2/4 on. When<Watch VHF > appears on the DSC display, the control signal "RT 1200" selects theDSC AF signal from RX board by switching the U31-3/4 on.

"Loop" control signal is used for self-test. Loop test is practiced by detecting MODEMoutput directly.

Input signals for transmitting modulation, W-MIC, MIC, MODEM, and REMOTE, areinput to U31-4/4. The "LINE MON" signal that controls this switch is set by "RT4- TXAF monitor" in "setting RT" on Page 3-6. Turning on the switch can monitor eachtransmitting input signal line and check which signal is coming in. However, note that the"MIC" (HANDSET) input line from the main unit microphone cannot be monitored.

Remarks) Receiving AF input signal for DSC is selected by "DSC setup".

• CH70 selection → <Watch VHF CH70> display

• VHF selection → <Watch VHF > display

1-15

5. Controller section

SIO

SIO

P2

PT

Adress Decode

ROM EEROM S-RAMBackup Control

AVR Reset Control

P2 P0P1 SIOSIO

NOR

1/13

Latch

P0

P1

P2

P1

P4 P3

P5

P6

P8

P9

P7 MODEM

µPD70320GJ (V25)

µPD771055GB (PIO)

HD6475328CP (H8)

MSM6927GS

MBM89371A (SIO)

U2

U3

U4

M27C40001 µPD43256BGU

U8 U5

AT28C64A

U20

SI-8031L M51953L

U19RESET15V

5V

Control BUS

Adress BUS

Data BUS

RESET

CLK

IRQ0

RESET8MHz CLK

16MHz

CLK OUT

8MHz CLK

DMC

NMEA

MIF (Serial Printer)

T/R 0

T/R 1

Dimmer

Contrast

Key Scan

Key In

S1

NMI

Beep/Beep Control

Alarm LED

DSC Recive Data

74HC4078AF

U13

74HC193AF

U12

U10

U14

U11

74HC245AF

74HC02AF : FU15 74HC138AF : FU1, 6, 7 74HC42AF : FU9

T/R

D02

T/R Control Data

T/R State DataT/R LED Data

LCD Data

LCD Control

T/R LED CH-Data Latch

T/R Key In

Modulation Line Select

Modulation Line Moni

ON Hook

TX PLL Data

TEMPPower DET (TX)

SQ DETSQ set

PTT (HS, W-HS, TX Key)

POW (DX-8700)

Y1

15.9744MHz

C2

MIF (RB-700)(T/RD04)

SQ Sig Input

Beep Out

(T/RD05)TX Power ControlRX Control Data (PLL, etc)

U29 AIN

SGI

RESET

Q18/19 (BT1)

(VHF CPU)

(DSC CPU)

7.9872MHzTP-1

NMI SW

INTR1, 2

Fig.1-11 Controllor Circuit

To clear the contents of EEROM and S-RAM for DSC , press [S1 : NM1] while keepingpower on; turn the power off, and on again; then <NO RAM EEROM ALL> will bedisplayed; and select an object item and press [ENT] key. (Refer to section 5.5 for moredetails.)

The oscillator frequency of Y1 (15.9744 MHz) connected to U2 (VHF CPU) determinesthe communicating speed of DSC (1200BPS). To adjust the frequency, turn on powerwhile pressing [CH16] key, then adjust C2 so that the frequency at TP1 becomes 7.9827MHz ± 30ppm.

1-16

Panel

(LCM-523-68HE-4)LCD

DATA (8bit) CONT (2bit)

CONTRAST (Vo)

DIMMER (DIM 5VB)

DSC ALM LED

ALM LED CONT (3bit)

Key Scan

KEY IN (5bit)

VHF

LED × 7

Latch(TC74HC573AF) × 4

Latch

LED ON DATA (8bit)

CH Indicator(7seg. LED × 3)

5VVHF KEY BOARD

Key In

(DB1-8, RS, R/W)

LED LE 0LED LE 1LED LE 2LED LE 3

(LED D0-7)

• REM • USA • WX • PRIV • TX • LOW • SP

1 2 3CAN -CEL

4 5 6 DIM

7 8 9 SELC

< 0 > ENT

ALM

CALL

DIST

KS 0

KS 1

KS 2

KS 3

KIN

0

KIN

1

KIN

2

KIN

3

KIN

4

ALM 0ALM 1ALM 2

CH16

HI/LOW

SP ON/OFF

SQ AUTO

SCAN/DW/OFF

DIMMER (DIM 5V)

DIMMER (DIM 5VA)

DSC KEY BOARD

Fig.1-12 Panel Circuit

1-17

Output power control

The output power of PA (U1) is picked up by the power detector CR6 and U2, andapplied to the comparator through the A/D converter. The comparator compares theoutput power of the PA with power data stored on the EEROM U8. The comparatoroutput signal is applied to the PA as power control signal through the U/D counter andthe D/A converter. Thus, the PA output power is controlled until the programmed outputpower is obtained.

Programming of the output power is carried out by rotating the CH knob in the poweradjustment mode. The power is programmed when the PTT switch is released.

The power adjustment is made on six frequencies, CH14, CH60 and CH88 in bothsimplex and duplex modes. Using two data among those data, the power data for otherchannels is determined.

TEMP and POW signals

Temperature signal "TEMP" is applied from POWER board to U2 on the CONTROLboard through RX board. When the temperature becomes 70 to 80 degrees, the powerdata from EEROM U8 is compensated by the TEMP signal and the output power isreduced to a minimum of 10 W depending on the temperature detected.

The power signal "POW" from the DX-8700 monitors T/R antenna power. During self-test, TRANSMIT POWER: NG appears if TX output power is less than 15W.

DET

U2, 7, Q3

U1: M57710A

PA

#2

15V

#3

#4#10.1~0.2W

(PG≥21.5dB)

10bit A/D

8bit D/A

COMP

U/D Counter

TX OUT (25W)

CR6, U2

POW DET(0 - 5.0VDC)

POW DETPOW CONT

TX (05P0618)

EEROMU8

U2

Power Data Write

Power Data Read

CONTROL (05P0616)

DX-8700

POW

POW DET

TEMPt C°

RT1101

RX PCB (05P0672)

POWER PCB (05P0617)

U3

CH KNOB

Power Data Display (000~999)

CPU

Power ADJ

-TSENCE

Fig.1-13 Output power control

1-18

Self-test

Self-test is made in the following process. The test includes receiver circuit test and AFloop back test. In the receiver test, CH70 RX and RX boards receive leakage of TX PLLmodulated DSC signal. In the loop back test, the MODEM output is fed back to theMODEM input on the CONTROL board.

Start

Start

CH70 RX AF supplied to MODEM (CH70 1200)

V25: DSC CPU H8: VHF CPU

Command Transfer

LOOP BACK TEST

End command transfer

End

Receiving


Status displayReading and decoding status error information

PLL UN-LOCK?

CH70 RX AF supplied to MODEM?

(CH70 1200)

RX A supplied to MODEM (RT1200)

MODEM output fed back to input (Loop)

Command transfer Start

LOOP BACK TEST


End

Status display

Receiving


Reading and decoding status error information

End

Result display

Reset status

Start

MODEM selected for TX (MOD IN) line

TX/RX PLL set to CH70

PLL UN-LOCK?

Un-lock flag set

Flag set for loop back test result

Result deta set

End

Loop back test(No TX during test)

Note) RX PCB and CH70 RX receive leakage of PLL RF signal

Preparation for receiving leakage of TX PLL RF signal by RX PCB

YES

NO (LOCK)

YES

NO

Preparation for receiving leakage of TX PLL RF signal by RX PCB

YES

NO (LOCK)

MODEM output connected to MODEM input

3 AF LOOP BACK TEST

1 CH70 RX PCB TEST

2 RX PCB TEST

(DSC modulation)

(See note.)

Fig.1-14 Self-test process

1-19

6. Power supply section

Line Filter REG

U2

Q2, 3 , 4

RL CONT

Over /Low Volt Protect

CB1: 10A

POWER SW

24V

Q1

U1

Filter PCB (05P0673)

Power PCB (05P0617)

Line Filter

TX PCB

J604-615V

J602-6

REMOTE: RB-700

Wing Handset: DX-8700

J610-1/2J304-3/4

J303-1/2J107-1/2

CONTROL PCBJ411-2

J304-1

RX PCBJ304-7

J304-8J208-1

J206-1

RX PCB

J301-1/2

J302-1

J302-2

J609-1/2

MB3761PF

RX PCB (05P0672)

REG

U12

TX ON

TX 8V

FIX 8V

REGU4

TX PCB (05P0618A)

J107-1/2

µPC78L05T

15V (PA)

5V

J204-1

J204-3

J103-1

J103-3

J208-1

J206-1

U9 AFP

AN7809F

REG

U13 AN78L05M

5V

SW

Q14


REG

REG

U20

U1812V

AN78L12M

SI-8031L

J411-25V

to A

to B

to C

to D

B

C D A

Filter PCB (05P0673)

J207-3TX

(To Wing Handset)

TX J603-3 TX

15V

15V

J602-5

See note.

K1

Note) (1) Overvoltage protector: activated by 32 VDC (2) Lowvoltage protector: activated by 20 VDC

Fig.1-15 Power Supply

1-20

7. IF-8500 (Printer interface)

Serial printer data from the FM-8500/8700 is sent to the printer interface IF-8500 whereMIF data or Furuno radio interface data is converted into parallel centronics data.

The output of the interface is connected to the printer PP-510.

Further, MF/HF terminal DSC-5/6, NBDP terminal DP-5/6, and No.2 VHF DSC (FM-8500/8700) can be connected to the IF-8500 which outputs the data on a first-in first-outbasis.

No.1 FM-8500 /8700

(Signal and Line conversion)

Parallel data

Adhering to Centronics (5 m MAX)

Serial data

Parallel data

NBDP (DP-5/6)

power supplyDC24 V

(50 m MAX)(50 m MAX)

(5 m MAX) (5 m MAX)

IF-8500

DSC (DSC-5/6)

No.2 FM-8500 /8700

PP-510Serial data

Parallel data

Fig.1-16 Connection of IF-8500

U1

(ROM/ RAM/ SIO)

U8

Photo Coupler

U9

Photo Coupler

REG

U11

SW REG

U10 12V DC24V 5V

Y1 9.2 MHz

U6

U3

U4

BUFFER

DSC (DSC-5/6)

NBDP (DP-5/6)

PP-510

BUFFER

BUFFER(HD647180XOFS8L)

(TA78DL12)(CBM-1205SF)

CB1

(1A)

CR3

(V06C)

TXD

TXD

RXD

RXD

IF-8500

No.1 VHF DSC FM-8500/8700

No.2 VHF DSC FM-8500/8700

DATA

DATA

DATA

Q1

Q2

CR10

Fig.1-17 Block Diagram of IF-8500

1-21

Series connection of IF-8500

When DSC-8VP, DSC-5V, and FM-7500, which output printer data in parallel format, isconnected to the IF-8500 together with DSC-5/6 and/or NBDP, the two IF-8500 must beused as below. The jumper setting must be changed.

J1

JP1JP2JP3

CB1

CPU BoardPut jumper.

not used

Parallel data

No.1 VHF DSC (ex. DSC-8VP)

No.2 VHF DSC (ex. DSC-8VP)

(JP3: Short)

IF-8500

PP-510

IF-8500

(JP3:open)

DSC port: J5 or NBDP port: J3

Serial port: TB-1 3-6 or Serial port: TB-1 7-10

Serial data

Serial port: TB-1 3-6 or Serial port: TB-1 7-10

NBDP

DSC-5/6

Parallel data

Fig.1-18 Series Connection of IF-8500

Setting of JP3 in IF-8500

JP3 Input Output

Port Data Port Data

J3 (NBDP) Parallel

J5 (MF/HF DSC) Parallel

Open(default)

TB-1 (No.1/2 VHF) Serial

J4 (PRINTER) Parallel

J3 (NBDP)Short

J5 (MF/HF DSC)Parallel TB-1 (No.1/2 VHF) Serial

2-1

1. Control Panel

ForDSC

For VHF

2. Rear Panel

HANDSET

WING HANDSETPRINTER

DMCNMEA

GND

POWER

TX ANTEXT SP

REMOTEBREAKER

RX ANT

Chapter 2 Location of Parts

2-2

3. Bottom View, Cover removed

Loosen these screwsto detach the panel

TX/RX/POWERBoards under the cover

CONTROL Board(05P0616A)

4. CONTROL Board

CPU for VHF(U2 : HD6425238CP/H8)

TP-1CH16 + PWR ON : 7,9872MHz±30PPM (C2 ADJ)

S1 NMI SW

CPU for DSC(U3 : UPD70320/V25)

JP-1(BATT ON/OFF)

ROM for DSC(U4 : M27C4001)

EE-ROM(U8 : AT28C64)

ROM BACK-UP(BT-1)

I/O(U12 : MBM89371A)

JP3/4JP2MIC SELECT

MODEM(U29 : MSM6927GS)

C2

2-3

5. Bottom View (CONTROL Board and the cover removed)

FIL Board (05P0673)PA

(U1 : M57710A) TX Board (05P0618A)

R79MIC

R64MOD

CR11(TX PLLUN-LOCKDetector)

C76TX Frq

TX VCOCR2(RX PLL UN-LOCK Detector)

C95 RX Frq(F-21.4MHz±10PPM)

RX Board(05P0672)

RX VCO

POWERBoard(05P0672)

6. Panel

PANEL Board (05P0615)

2-4

7. Duplexer (DX-8700)

C73(156.525 to 16.9 MHz ±10PPM at TP1)

CH70 RX Board

TP1

J6: CH70 IN

J1: D RX

RX OUTNMEA

CH70RX ANT

ANT

J4: ANT

WING HANDSET

TX IN

TP2(16.445 MHz CHK)

J2: D ANTJ11

J10

C23

TB-1

J5: CH70 OUT

C14

J3: D TX

Duplexer

3-1

3.1 Outline of system setting

The following operations shall be executed only by the dealers and agents that FURUNO has approved. Those dealers and agents shall conduct the following system setting under their responsibility. It is strictly prohibited to disclose this information to the operators and possessors of the machine, because immoderate changes of the system setting will cause performance variation of the apparatus.

Precautions

The system setting will be executed when the machine is installed. However, when thesystem setting change is required because of unit exchange or other reasons, followthe procedures described on the following pages.

Contents of system setting

Confirmation of the ID number of the own ship

(How to change the ID number is described on Page 3-15).

Selection of receiver section (VHF receiver or CH70 receiver) and ON/OFF

setting of DMC connection

Pre-settings in VHF section

(1) Selection of USA/WX mode

(2) Confirmation of Private mode (How to change the mode is described on

Page 3-15).

(3) Auto-revert function

(4) Automatic ON/OFF setting of internal speaker

(5) Restriction on continuous transmission time

(6) Monitoring of sending sound

(7) Automatic 1W function

(8) Dual watching

(9) Scanning

(10) Setting of audio squelch range

Channel pre-setting of each mode

Setting of transmitting power (Maximum power and reduced power)

LCD display selection between Japanese and English

DSC section

VHF section

1

2

3

4

5

Chapter 3. Change of System Setting

3-2

3.2 Change operation to normal mode or test mode

Change of the system setting, except " Input of ID number of the own ship", isexecuted after changing from normal mode to test mode in the following procedures.

The normal mode means the state in which <Watch VHF> is displayed on the LCDscreen of DSC and the test mode means the state where <TEST VHF> is displayed.

Procedures

Protection OFF

1. In the normal screen, press SELECT key first and 9 key next. Then thisdisplay will appear.

V P ID DSC RT CH PO L

Blinking

Display 1

2. Put the cursor on "P" by using key and press ENT key.

* System protected *

3. Input password (secret code).

Protection < >

ON OFF

6 5 2 1 1 1

4. Put the cursor on "OFF" by using key and press ENT key. Now, DSC,RT, CH, PO, and L can be changed.


Power adjustment (p.3-10)

Display 1

Channel preset (p.3-8)

Preset of VHF (p.3-6) Selection of receiver (p.3-4)

Confirmation of ship’s ID number (p.3-14)

Display mode selection (p.3-12)

1

2

3

4

5

6

3-3

Protection ON

After changing the system setting of DSC, RT, CH, and PO, return to the normalmode in the following procedures.

To close the display for setting, press CANCEL key several times.

Test

How to return to the normal mode (Watch display)

Test

V P ID -------

Protection < >

ON OFF

SELECT 9

ENT

ENT

Select "P" by pressing key, then press key.

Select "ON" by pressing key, then press key.

Press key twice to return to the watch display.CANCEL

After changing system setting, be sure to return from <TEST> mode to the normalmode of <Watch> display.

3-4

3.3 Change of system setting

[About the rules for key operation]

In the selection menu as follows, two methods are available to choose one item. Oneis to select an item by using the arrow key and press ENT key. The other is simplyto press the number key corresponding to the required item.

CH70[1] VHF[2]Selectionmenu

DSC: Receiver

(Example)

Selection method

• Put the cursor on the required item with the arrow key and press ENT key.

• Or, press the required number key, 1 or 2.

1. Setting DSC (Selection of receiver)

V P ID DSC ---

ENTAt the display 2 (shown above), press key.

Select "DSC" on the display 1.

CH70[1] VHF[2]

DSC: Receiver

ENTSelect either one with the arrow keys followed by key, or by pressing the corresponding numeric key.

(Continued on next page)

Display 2

CH70 DSC CH70 receiver usedVHF VHF receiver used

Note : Normally select "CH70" for DSC continuous watch. If two FM-8500 are installed for duplication, select this setting as follows :

Main (No.1) FM-8500 "CH70"Sub (No.2) FM-8500 "VHF"

When No.1 FM-8500 fails, use No.2FM-8500 after interchanging thesesettings.

3-5

V P ID DSC RT CH PO LDisplay 3

(From previous page)

ON[1] OFF[2]

DSC: remote DMC

ENTPlace the cursor on a desired item with arrow keys, then press key. Or, press corresponding

numeric key (1 or 2).

Note) When FM-8700 is connected to DSC, select "ON[1]".

3-6

2. Setting RT (Function of VHF section)

Refer to the next page for the factory default value.

RT1- Mode: USA/WX < >

OFF[1] ON[2]

After selection

RT1- Mode: private < >

protected <OFF>

After selection

RT2- Hook work: CH16 < >

ON[1] OFF[2]

After selection

RT2- Hook work: SP < >

ON[1] OFF[2]Automatic internal speaker setting (on/off)according to handset status as below.

After selection

Auto revert function(Automatic setting of CH16 onON HOOK status)

Selection of USA/Weather modes

Function

Selection of Private mode

"Protected"

Handset SpeakerON HOOK onOFF HOOK off

RT3- Time out timer < >

OFF[1] ON[2] ON: 5 minutesOFF: no limitationAfter selection

RT4- TX AF monitor < >

OFF[1] ON[2]

After selection

Tx AF monitor from DSC, Handset,Wing Mic or remote station.

Continuous transmission time limit

To INT SP

To RB-700(line-out)


DSC

Wing Mic

Handset

RB-700

To Tx line

Tx AF monitorON/OFF commandfrom CPU

ON: EnableOFF: Disable




3-7

RT5- Auto 1W < >

ON[1] OFF[2]

After selection

RT6- Dual Watch < >

ON[1] OFF[2]

After selection

RT6- Scanning < >

ON[1] OFF[2]

After selection

RT7- Auto SQ < >

LOW= HIGH HOLDAudio squelch (voice detectingtype SQ) range setting

Scan operation

Auto 1W (Power is automatically reduced to 1W when the low output power channel is selected.)

Function

Dual watch operation

LOW : Lower limit of voice freq.HIGH : Upper limit of voice freq.HOLD: SQ hold time (SQ open time after signal goes away.)


Display 4

(Setting value) x 20 = ms

Enter 2-digit data for lower limit followed by key. Then enter "HIGH" and "HOLD"

data in the same manner as "LOW".

ENT

(Setting value) x 50 = Hz



Default settings

Delivery RT1Mode:USA/WX

RT1Mode:PRIV

RT2Hook work:CH16

RT2Hook work:SP

RT3 RT4 RT5 RT6DW

RT6SCAN

Standard OFF OFF ON ON OFF OFF ON ON ONUSA ON OFF ON ON ON OFF ON ON ON* RT7) LOW=06 HIGH=16 HOLD=30

3-8

3. Setting CH (Channel presetting)

Transmission/reception mode, communication mode, and output power can beselected as follows.

In the display 4 on the previous page, press ENT key.

INTL CH: XX < >

ENABLE= TX[1] RX[2] UN[3]

Select a desired channel mode and a channel with the channel knob. (Refer to right figure)

INTL CH: 20 < >


After selection

INTL CH: 20 < >

TELECOM= SIMP[1] DUP[2]

After selection

TX : Both transmission and reception available.RX : Reception only availableUN : Unable (Neither transimission nor reception available)


(Example) An example when CH20 of INTL (International channel) is selected. (Refer to the next page when the private mode (PRIV) is selected.)

This shows the preset seting status on INTL CH20.

SIMP : SimplexDUP : Semi-duplex

USA WX PRIV

Every one pressing the channel knob successively changes the channel mode as follows.

LEDs

CHANNEL Knob

INTL USA WX PRIV(No LED)

Then, set to the desired channel by turning the channel knob.

Communication mode selection

3-9

INTL CH: 20 < >

TX POWER= HIGH[1] LOW[2]

After selection

INTL CH: 20 < >


Setting on INTL CH20 can be checked.

HIGH : 25WLOW : 1W

Output power selection

INTL CH20 has been preset.


An example when the private mode is selected.

P01/CH : XXX < >

PRIV No. SELECT: [<][>]key

P02/CH : 100 < >

(Example) Memory No: 02, CH: 100

Set every item successively in the same manner as an example

when CH20 of INTL (International channel) is selected. on the previous page.

After presetting all the channel mode, exit from the channel preset menu by pressing key.


Memory No.

Select a desired memory number (maximum: 20) with the arrow key and press key.Then, select a channel to preset by turning the channel knob. (Refer to the appendix 2 for the channel list.)

ENT

CANCEL

Display 5V P ID DSC RT CH PO L

3-10

4. Setting PO (Setting transmitting power)

In the display 5 on the previous page, press key (Selection of "PO"), thenpress ENT key.

DUP Pow- CH60 <HI:XX>

SELECT [MODE][CH][H/L]SWHigh power adjustment on INTL CH60

Set on CH14, CH60, and CH88. To compensate a power loss in the duplexer, set themaximum power and reduced power in "DUP" and "SIMP" modes on these channelsas follows.

The channel to set power, DUP/SIMP mode, and the power setting value (power data)are displayed.

• The case of CH60 in DUP and SIMP modes

Set the maximum transmitting power (power data) by turning the channel knobwhile pressing PTT switch. Releasing the PTT switch at the desired value fixes thevalue. (Power data: 800 ± 100 → Transmitting power of approximately 25 W) ------- Refer to the next page for the power data.

Next, press HIGH/LOW key, then this display will appear.

DUP Pow- CH60 <low:XX>

SELECT [MODE][CH][H/L]SWLow power adjustment on INTL CH60

Set the reduced power (power data) in the same way as above.

• The case of CH14/CH88 in DUP and SIMP modes

Set the channel to CH14 (or CH88) in DUP or SIMP mode by turning the channelknob.

SIMP Pow- CH14 <HI:XX>

SELECT [MODE][CH][H/L]SWHigh power adjustment on INTL CH14(or CH88)

Set both the maximum and reduced power in the same way as the case of CH60.

After setting the powers in DUP and SIMP modes, set powers in the private mode.In the private mode powers can be set in every channel independently.

3-11

To change to the private mode, press [CH16] key while pressing and holding downthe channel knob. To change the private channel, turn the channel knob.

TX Power:Priv01< >

SELECT:[MODE][CH][H/L]SWPRIV mode

After the completion of power adjustment on all modes, press CANCEL key.


V P --------------- PO LDisplay 6

3-12

5. Setting L (Selection of LCD display, Japanese or English)

For the transmitting/receiving message display in DSC and menu display, Japanese(katakana) or English is select.

LCD language < >

E[1] J[2]

ON OFF


Select "P", then press key.

Select "ON", then press key.

To return to the normal display, press key several times.

After selection

Press key.

Protection < >

ENT

ENT

ENT

Language Selection

E: EnglishJ: Japanese

V P --------------- PO L

CANCEL

3-13

3.4 Change of jumper settingSetting wing handset type

Change the setting of a jumper plug JP2 on CONTROL board in accordance with thetype of wing handset. Whichever, "D" or "C", is selected, adjusting R127 is notrequired.

D CCD

R127

For Carbon MIC(Default)

CD For Dynamic MIC

Ni-cdBattery

JP2 (Jumper Plug)

Top view of CONTROL Board

or

Setting on common or respective use of antennas

If an antenna is commonly used for both VHF and CH70, or if two individualantennas are used for VHF and CH70, wirings in DX-8700 must be changed.

• Use of one antenna commonly for VHF and CH70;Connect J5 CH70 OUT and J6 CH70 IN with a coaxial cable with mini-pins.

• Use of two antennas respectively for VHF and CH70;Connect the coaxial cable with mini-pin from "CH70 RX ANT" connector to J6 CH70 IN .

TB1

D RX

ANT

D ANT

D TX

J10J2

J4

J3

J11J5

J1J6

(CH70 IN)

(CH70 OUT)

RX OUTTX IN ANT CH70 RX ANT

Duplexer

CH70 RX Board

3-14

3.5 Confirmation of ID number

Procedure

1. In the normal display, press SELECT key first and 9 key next. Then thisdisplay will appear.


Blinking

2. Put the cursor on "ID" by pressing key and press ENT key.


3. Confirm the ID number of the own ship. (MMSI : Maritime Mobile Ship Identity)

* Own identification *

Protected MMSI: X1~X9

Own ship ID

4. After the confirmation, return to the normal display by pressing CANCEL keyseveral times.

3-15

3.6 Changing ID number and ON/OFF of Privatemode

Procedures

1. Turn on power and press NMI switch.

Control Board(05P0616A)

Ni-CdBattery

NMI Switch (S1)

Bottom view of Main Unit, Cover removed

2. Once turn off the power.3. Turn on the power again, then this display will appear.

Clear < >

NO RAM EEROM ALLNote that EEROM clear changes theRT : VHF presetting to the default.

4. Select EEROM with the arrow key and press ENT key.A display "Now WRITING EEROM" will appear, and after about 15 secondsanother display "Turn off the power" will appear. Then, turn off the power.

5. Turn on the power again, then this display will appear.

TEST VHF ch70

manualTest mode

6. Press SELECT key first and 9 key next, then this display will appear.


Blinking

7. Put the cursor on "ID" by pressing key and press ENT key.

Enter own indentification

[digits] MMSI=

MaritimeMobileShipIdentity

MMSI =

Entry of ID

3-16

8. Input the ID number of the own ship with nine digits, check to be sure about theinput number, and press ENT key. (When a wrong number is input, press

CANCEL key and re-input the correct number.)

V P ID DSC ---

9. Put the cursor on "RT" and press ENT key twice.

OFF[1] ON[2]

RT1- Mode: private < >

Selection

Private mode ON/OFF selection

10. After the selection, return to this display with CANCEL key.


11. Put the cursor on "P", and press ENT key.

Protection < >

ON OFF

12. Select "ON", and press ENT key. (Here, by pressing ENT key again, the inputID number can be confirmed. If the number is incorrect, input the correct numberfrom the first step. )

13. Return to the normal display by pressing CANCEL key several times.

Watch VHF ch70

auto

The ID number to input must be the MMSI number that is allocated to the ship. Again, check that the input number is correct.

4-1

4.1 Transmitting frequency and power

TX Frequency

TX Freq. On CH16 Conditions Adjuster Rated Value

156.8MHz ± 300Hz PTT : ON C76(TX Board)

±10PPM

Connect a frequency counter as illustrated below, and read the frequency on CH16 withPTT switch ON.

DX-8700

Wattmeter(50Ω)ANT

CH70 RX ANT

Dummy load(50Ω)

FrequencyCounterMake a pick-up coil by winding a wire by four

to six turns like a coil, and connect it to the frequencty countor.Put the pick-up coil close to the dummy resistor or ANT coaxial cable, and pick up the transmitting frequency.

1

2

If the measured frequency is out of specification, adjust C76 on TX board.

The C76 is a variable capacitor to adjust the reference frequency of the transmittingsynthesizer PLL circuit. By adjusting the frequency of only one channel, the transmittingfrequencies of all the other channels are adjusted at the same time.

TX Board

Control Board Hole for C76 adjustment

Bottom View Cover removed

Transmitting power

For adjusting transmitting power, refer to setting "PO" in Section 3 "System setting" onPage 3-10.

• Default power (factory setting): 21-25W(Reduced power specification: 0.7-1W)

Chapter 4. Adjustment andMeasurement

4-2

4.2 Measurements on CH70

CH70 is a channel allocated for VHF DSC. Transmission on this channel does not workby depressing the PTT switch on the handset. Measurement of power and frequency onCH70 are made in DSC operation. Tone frequency (mark/space) is also measured in DSCoperation.

For these measurements on CH70, DSC operation must be changed from its normalmode (watch display) to test mode (test display).

After the measurements, be sure to return DSC operation to normal mode.

Change DSC mode from WATCH to TEST

Change DSC mode from TEST to WATCH.

Tone Measurement

CH70Freq & PowerMeasurement

Key operations on DSC

From "Watch" screen to "TEST" screen(Protection : OFF)

SELECT →

CH70: 156.525MHz±300Hz

From "TEST" screen to "Watch"screen (protection:ON)

Mark : 1300±10HzSpace : 2100±10Hz

Remarks)

1. Tone frequency (mark/space) cannot be adjusted.If the frequency is out of ±10 Hz of the specification, Y3 (3.58 MHz) on CONTROLboard is faulty.

2. For adjusting power of CH70, refer to "setting PO" in Section 3 "System setting" onPage 3-10.

3. For adjusting frequency of CH70, refer to Page 4-1 in this section.

4-3

1. Mode changeChanging to test mode

1. In the normal mode, press the keys -SELECT → 9 → → ENT -successively.


2. Input a password (secret code) ----> Password: 652111 (These digits are not shownon the display.)

Protection < >

ON OFF

3. Select "OFF", and press ENT key.----> This leads to test mode.4. Change the display to test mode by pressing CANCEL key several times. ("TEST"

flashes.)

5. Measure the tone (mark/space), power, and frequency of CH70.→ → “TONE” selection (Refer to the next page for this

measurements.)SELECT

Returning to the normal mode

6. Successively press the keys -SELECT → 9 → → ENT .

Protection < >

ON OFF

7. Select "ON", and press ENT key. --- This leads to the normal mode.8. Return to the normal display ("Watch" display) by pressing CANCEL key several

times.

4-4

Outputting mark/space signal.

Preparation) For measuring tone signal, connect a frequency counter to the externalspeaker terminal (EXT terminal) on the rear panel of FM-8700. (EXTspeaker load: 4 Ω or 8 Ω) Set the audio volume at an appropriate level.

1. Set the VHF channel to "CH70" (Turn the channel knob). Next, press HIGH/LOW keyto make transmitting power LOW. ("LOW" illuminates.) ----->This preventstransmitting power from being induced to the counter.

2. Press keys: SELECT → .

TONE DIST-CH

3. Press ENT key, then this display will appear.

CR MARK SPACE …

4. Select "MARK" (mark) and press ENT key, then this display will appear.

Now doing

5. To output the mark signal, depress the PTT switch on the handset. (If the speaker ison, the mark tone can be heard.)

6. Confirm that the mark signal frequency is within the specification (1300 ± 10 Hz).7. Press ENT key to stop the mark signal output.

CR MARK SPACE …

8. After confirming the cursor is on "SPACE", press ENT key.9. Press the PTT switch on the handset to output the space signal.10. Confirm that the space signal frequency is within the specification (2100 ± 10 Hz).11. Press ENT key to stop the mark signal output.12. Change the display to test mode by pressing CANCEL key several times.13. Return from the test mode to the normal mode ("Watch" display).

4-5

Outputting the transmitting carrier of CH70 (Measurement of the power and frequency)

Preparation) For the measurement, connect the measuring instruments in the samemanner as shown on Page 4-1.

1. Set the VHF channel to "CH70". (Turn the channel knob.)When measuring "Reduced power", set to "LOW" with HIGH/LOW key.

2. Press the keys: SELECT →

TONE DIST-CH

3. Press ENT key, then this display will appear.

CR MARK SPACE …

4. Select "CR" (carrier), and press ENT key, then this display will appear.

Now doing

5. Press the PTT switch on the handset to output the carrier.6. Measure the power (25 W) and frequency deviation (±300 Hz) of CH70 (156.525

MHz).7. Press ENT key to stop carrier output.8. Change the display to test mode by pressing CANCEL key several times.9. Return from the test mode to the normal mode ("Watch" display).

4-6

4.3 Other measurements

1. Confirmation of receiver sensitivity

For simplicity, measure the 20dB NQL (Noise suppression limit sensitivity).

Preparation

Connect the measuring instruments as follows.

RX ANT EXT SPSSG (FM)

Low-frequencyWatt meter

FM-8700

50Ω

24VFM-8700 Settings : CH16,

SQ OFF, Adequate Volume

4Ω, 3W, SPor, 4Ω, (3W)Dummy Load

Measurement

1. Output from SSG the signal of about 0 dBuV, frequency of 156.8 MHz, modulatingfrequency of 1 kHz, and frequency deviation of 3.0 kHz, and confirm that this signalcan be received.

2. Turn the SSG modulation off and switch the SSG output off.3. Measure the noise level from the speaker with a low frequency voltmeter and adjust

it to 0.5 Vrms by turning the audio volume.4. Input the unmodulated signal from SSG.5. While varying the SSG output, search for such an output level as the noise output

level is decreased by 20 dB (0.05 Vrms). If the level is less than 0 dBuV, thesensitivity is good.

Remark) No volumes or no other parts on the PC-boards are used for adjusting the sensitivity. Do not arbitrarily adjust any parts or transformers on the boards.

4-7

2. Confirmation of transmitting modulation degree

Preparation

Connect the measuring instruments as follows.

TX ANT

MICLow-frequencySG(AF OSC)

ATT.

FM-8700

600Ω

50ΩCoupler

FM LinearDetector

50ΩWattmeter

50Ω

50Ω

24V

Settings : CH16, MAX Power

PTTSwitch

1kHz output

Measurement

1. Set the AF OSC output to -46 dBm; 1kHz.2. Transmit FM-8700 with PTT switch on.3. Adjust the coupler and FM linear detector, and measure the frequency deviation. The

specification: 2.4 - 3.8 kHz4. To check the maximum frequency deviation, adjust the AF OSC output so that the

frequency deviation becomes 3 kHz.5. Check to be sure that the maximum frequency deviation is less than 5 kHz when the

AF OSC output level is increased by +20 dBm from the adjusted value above.

Reference) These adjustments are made by the potentiometers, R79 (MIC) and R64(MOD) on TX board. Do not adjust them arbitrarily. When the adjustmentsare required, be sure to use calibrated measuring instruments.

Adjusting method

1. Turn R79 (MIC) fully CW (maximum).2. Measure the maximum frequency deviation by following step. 4 of the above

measuring procedure, adjust the volume R64 (MOD), and set the deviation to 4.7kHz.

3. Set the AF OSC level to -46 dBm, and adjust the frequency deviation to 3 kHz withR79 (MIC).

4-8

3. Confirmation of receiving sensitivity of CH70 RX board

In the regular measurement, the error rate in DSC should be measured by inputting DSCmessage signals on CH70. However, to derive an indication of the sensitivity, the NQLof the CH70 LINE output of CH70 RX board (J8-5, 6) is measured by inputting a signalCH70 (156.525 MHz) from CH70 RX ANT of DX-8700.

Measuring method is same as that described in "1. Confirmation of receiver sensitivity"on Page 4-6.

Preparation

ANT

J8

T.B.

CH70RX ANT

Duplexer

CH70 RX Board

DX-8700Low-frequency voltmeter (Connected to J8 #5 and #6).

SSG (FM)

J8-5 : CH70 RX-H6 : CH70 RX-C

Jumper setting must be checked.See section 3.4 in chapter 3.

Measurement

1. Output the signal from SSG; about 0 dBuV, 156.525 MHz, modulating frequency of1 kHz, and frequency deviation of 3.0 kHz, and confirm that this signal can bereceived.(The receiving sound can be heard by turning TX AF monitor on by the systemsetting.)

2. Turn the SSG modulation off and switch the SSG output off.3. Read the CH70 RX level (AF LINE) output on the low frequency voltmeter.4. Input the unmodulated signal from SSG.5. While varying the SSG output, search for such a SSG output level as the level read in

step. 3 is decreased by 20 dB (1/10). If the level is less than 0dBuV, the sensitivity isgood.

Remark) No volumes or no other parts on the PC-boards are used for adjusting the sensitivity. Do not arbitrarily adjust any parts or transformers on the boards.

5-1

In this apparatus a high voltage that may cause shock, burn, or even death is applied. Do not touch inside in case a man has no knowledge of electrical circuits or exact safety measures are not taken.

Warning

5.1 Periodical check

To derive full performance of the apparatus, a periodical maintenance check isindispensable. Do all maintenance checks after turning power off.

1. Cleaning of display portion

The display portion is made of an acrylic board. Wipe dirt off with a soft dry clothperiodically. Never use gasoline, paint thinner, or benzene for the cleaning.

2. Check of loose connectors

Check to be sure that the connectors and earthing terminals of FM-8700 and DX-8700are tightly fastened. There are many connectors inside the apparatus. At least once half ayear check to be sure that those connectors are not loosened by ship vibrations.

3. Antenna

Items Check points RemediesWhip antenna Is there any cut or water leak at

the connector portion ?Exchange it if the cutis deep.

Coaxial cable Is there any cut on the surface ? Wind a tape round thecut, if any.

Chapter 5. Maintenance check

5-2

5.2 Everyday operational test (Self-test)

Be sure to do operational test everyday to find malfunctions in advance, if any. (Do thetest everyday so that a distress message could be transmitted without fail in a distress.)

Watch VHF CH70

• If the PTT switch was pressed once before this test.

Alarm sounds. (Distress alarm check)

To silence it, press key.

Please wait !

VHF DSC SELF-TEST

(Normal display)

* Test in progress *

VHF DSC: GOOD

* Completed * Daily test

(Testing)

(TEST)

• If the PTT switch was not pressed once before the test.

VHF DSC: GOOD NO TX CHECK


Several seconds later

(Including TX check.)

Returns to normal display.

Press key at the normal display.

3

3

CANCEL

ALARM STOP

5-3

If "NG" appears


VHF DSC: NG

(Error messages)

Check end: [CANCEL] key

To view reason for NG,

press .

Returns to normal display.

CANCEL

ENT

Pressing key scrolls

the error message displays.

ENT

"NG" error messages and their meanings and remedies are shown on the next page.

5-4

"NG display"

Six "NG displays" are included in the test. If any error occurred in the test, NG portionscan be displayed by pressing ENT key successively as mentioned above.

Eitherappears.

The transmitting power is less than about 15 W.

CPU for DSC (U3) commands CPU for VHF (U2) to send mark/space signals and the signals are received through the modem (U29). Then, whether the transmit-ted and received signals are the same in level and frequency, or not, is checked.

Check TX board (Power Amp. U1), defective antenna or DX-8700.

TRANSMIT POWER: NG

NG display Meanings Remedy

CPU for VHF (U2) detected unlock-ing of the PLL on TX board.

Check PLL (U5) and associated components on TX board.Replace TX board.

Check MODEM (U29) on CONTROL board.Replace CONTROL board.

TX PCB (PLL LOCK): NG

CONTROL PCB: NG

CPU for VHF (U2) sends mark/space signals to the transmit-ting circuit (excluding the power amplifier). The receiving circuit of CH70 picks up the signals and sends them back to U2. U2 com-pares the received signals with the transmitted signals in level and fre-quency.

Check CH70 RX circuit. Replace VHF RX/CH70 RX board.

CH70RX PCB: NG

The transmitting power output from the duplexer is compared with the transmitting power output from the main unit was compared and a big power loss in the duplexer was detected.

Replace duplexer.DX-8700: NG

CPU for VHF (U2) detected unlocking of the PLL on RX board.

Check PLL (U10) and associated components on RX board.

RX PCB: NG

(AF Loop back test)

(RF Loop back test)

U3

U2 Tx Circuit

CH70 RX

DSCCPU

VHFCPU MODEM

U2 U29 U31

Pickedup

Mark/Space

U30

5-5

5.3 Exchanging the nickel-cadmium battery

The nickel-cadmium battery on CONTROL board backs up contents of RAM (all thetransmitted/received messages). The life of the battery is approximately five years. (Thenominal voltage of the battery is about 3.6 V. If the voltage is more than 3.6 V withpower supply off, the battery is normal.) Examine the battery voltage at regular intervalsso as not to lose the important data backed-up. When the voltage has dropped, exchangethe battery after printing out necessary transmitting/ receiving messages.

If the battery is left for about one month without power supply, the battery will beflat and the RAM contents will be lost. Be careful enough!

Procedure

1. Turn off power. However, if it is desired not to erase RAM contents, unplug thejumper plug JP1 on CONTROL board with keeping power on.

2. Remove the old battery.3. Set a new battery (Type: N-50SB3, Code no.: 000-835-126) and plug in the JP1

again.

Warning: RAM contents would be erased, if the jumper plug JP1 is unplugged while

power supply is off.

Bottom, View, to cover removed

Ni-cdBattery

Control Board

JP1

5-6

5.4 Exchanging ROM

Confirmation of ROM version

1. In the normal display, press keys: SELECT → 9 , then this display will appear.


Blinking

2. Select "V", and press ENT key.

RT:1.xx DSC:1.xx

ROM version

Press three times to close the display.

RT: VHF ROM version levelDSC: DSC ROM version level

CANCEL

Remark) The ROM for DSC is U4 on CONTROL board and the ROM for VHF iscontained in the CPU (HD6475328CP (H8/532)) U2 on CONTROL board.• DSC ROM version 05501-92-10X• VHF ROM version 05501-93-10X

ROM location

Remove the bottom cover by unscrewing four screws on the bottom of the main unit.

Bottom view, cover removed

ROM (U4)

Control Board

NMI Switch (S1)

5-7

Setting after exchanging ROM

After exchanging ROM , be sure to clear RAM as follows.

1. Turn on FM-8700. Then, this "Clear display" will appear and "RAM" flashes.

NO RAM EEROM ALL

Clear < RAM all area >

Blinking

<CLEAR Display>

2. Press ENT key. After a while this message will be displayed on LCD. Then, turnoff the power switch of the main unit.

Turn off the power

3. Switch on the power switch again. When this normal display appears, the RAM hasbeen cleared.

auto

watch VHF ch70

Details about RAM, EEROM and ALL are described on the following page.

5-8

5.5 About NMI switch

To clear contents of S-RAM and EEROM, press S1 (NMI switch) on CONTROL boardwith keeping power supply on. For the location of S1, refer to Page 5-6.

Procedures

1. Turn on power, and press NMI switch.2. Once turn off the power.3. Turn on the power again, then this display will appear.

NO RAM EEROM ALL

Clear < >

4. Select a desired item by using the arrow key, and press ENT key.5. If "RAM" is selected, "Turn off the power" will be displayed. Then, turn off the

power. If "EEROM" or "ALL" is selected, "NOW WRITING EEROM" will bedisplayed. About 15 seconds later the display will change to "Turn the power off",then turn off the power.

6. Turn on the power again.

When RAM is cleared: No system resetting required.

When ALL or EEROM is cleared:

TEST VHF ch70Test mode

If required, set the system referring to Chapter 3. After setting the system, be sure to set "Protection menu" to ON and return to the normal mode.

manual

5-9

About "RAM", "EEROM", and "ALL".

Clears all contents of S-RAM (*1).RAM

PurposeItem

Clears all contents of S-RAM and a part of EEROM (*2).EEROM

Clears all contents of S-RAM and EEROM.ALL

(*1) Contents of S-RAM are:1 All transmitted/received messages2 Contents set by pressing SELECT key → 1, 2, 4, 6.

(*2) Contents of EEROM are:1 Contents set by pressing SELECT key → 9.

(System setting data)2 Contents set by pressing SELECT key → 7.

(Messages in the file: Messages stored in the memoryafter they are made)

3 Contents set by pressing SELECT key → ALM.

Remarks) The pre-set data of channel (CH) and transmitting power (PO) remainunchanged even after "EEROM" has been cleared. That is, all the other setvalues are cleared -returned to the factory default values.

6-1

6.1 Functional tests

For functional tests (practiced by technicians), change the display to "Test" mode. Then,select a test item from the menu and execute the selected test, e.g. ROM test.

After the test has been finished, be sure to return the display to the normal mode (Watchdisplay).

Watch



Protection < >

Diagnosis < >

ON OFF

This is a password todisplay the "protection"menu.

ROM RMT KEY DIS PRT

Select "OFF", then press key.

(Now the test mode is selected.)

ENT

SELECT 9

V P ID

ENT

Test Menu

CANCEL 3

1. ROM/RAM test

2. Remote line test

3. Keyboard test 4. Display (LCD) test

5. Printer test

Select test desired with the arrow keys,then press key.ENT

6 5 2 1 1 1

Chapter 6. Troubleshooting

6-2

1. RAM/ROM test

ROM/RAM test < >

Select one, then press key.

ROM CHECK OK

To quit, press key.ENT

test:[ENT] ROM RAM EEROM

ROM/RAM test < >

ENT

For error, NG appears.

ROM test takes about 10 mimutes.

To return to Test menu, press CANCEL key.

Parts number for RAM and ROMs are;

ROM: U4

RAM: U5

EEROM: U8

6-3

2. Remote line test

This test checks the remote signal line (MIF data line) for proper operation.

Remote test < >

Select one, then press

key.

Remote test < >

CONNECTION:CHECK OK

To quit, press key.

test:[ENT] NMEA DMC RB P

ENT

ENT

VHFCPU

U2(H8)

PIO

U14

DSCCPU

U3(V25)

SIO

U12

Nav. Device(NMEA:Connectioncheck only)

IF-8500(Printer I/F)

DMC-5

RB-700

For factory use

To return to Test Menu on page 6-1, press CANCEL key.

The following two types of test can be performed.

• Remote line check inside of RB-700, DMC-5 or IF-8500(No modification is required.)

FM-8700

MIF command

MIF command

TXD(H)

TXD(C)

RXD(H)

RXD(C)

RXD(H)

RXD(C)

TXD(H)

TXD(C)

RB-700, DMC-5or

IF-8500

• Interconnection check (Add jumper wires as shown below.)

FM-8700

MIF command

MIF command

TXD(H)

TXD(C)

RXD(H)

RXD(C)

RXD(H)

RXD(C)

TXD(H)

TXD(C)

RB-700, DMC-5,IF-8500 or

Nav. Device

Jumper wires added

6-4

3. Keyboard test

Keyboard test < >

Press keys and controls one by one. The number (or character) corresponding the key and

controls pressed appears if key is functioning correctly. When pressing and holding down the

CHANNEL control, three LEDs (USAA/WX/PRIV) blink in order. (When pressing the

or key, the LEDs near the key light.)

[ANY KEY]

To quit, press or key. The Test Menu on page 6-1 appears.CANCEL

DISTRESS

ENT

ALARM STOP

4. Display (LCD) test

Display test < >

LCD blinks if it functions correctly.

test:[ENT]

To quit, press or key. The Test Menu on page 6-1 appears.CANCEL ENT

ENT

6-5

5. Printer test

Print out test

Now doing

To quit, press key several times.

test:[ENT]

Test

ENT

CANCEL

The test data (numerals andcharacters) is printed out.

FM-8700

DSCCPU

U3(V25) IF-8500

(SIO incorporated)

Serial data(TXD/RXD)

Parallel dataPP-510

How to return to the normal (watch) mode


Protection < >

Select "ON", then press key.

To return to the normal display, press key twice.

Test

V P ID

SELECT 9

ENT

ON OFF

ENT

CANCEL

6-6

6.2 Error messages

1. CPU communication errors

If a communication error occurs between the two CPUs (U2: CPU for VHF, U3: CPU forDSC) on CONTROL board, one of the following messages will appear.

*Error* CPU communication

One of three messages in the table below appears.

Error Meanings Remedy

TYPE: 1 (no change to in)

TYPE: 2 (no ack/time out)

TYPE: 3 (no initialize)

The port in U2 does not change to an

input port.

After pressing key, try the

same operation again (e.g. press

key). If the symptom is

still unchanged, try again after resetting

power once more. Then, if the error

still continues, clear the contents of

RAM or EEROM.

-----> Refer to Page 5-8.

After key for DSC has

been pressed, U2 does not send the

command of transmission end to U3

within 5 seconds.

After U2 has received a test request (

key for DSC) from U3,

U2 does not send back any response to

U3 within 5 seconds.

When power has been turned on, or a

system setting has been changed, U2

cannot read correct data.

CALL

TEST

CANCEL

TEST

6-7

6.3 Confirmation by line monitor

By using line monitor function, this test checks whether each AF line signal is coming inTX board. The rated level of MOD input to TX board is 35mVrms (600Ω). The systemdiagram of the line monitor is shown below.

Wing Handset

MICSEC

Handset

DSC

Remote (RB-700)

R153

W-MIC

Volume

R154

MIC

W-MIC

MIC

R155

MODEM

MODEM

R156

REMOTE

REMOTE

Control Board

U30-3/4 LINE MON

on/off selected on system setting RT-4.

TX Board

RX Board

MOD

SP

U9

To output the line monitor, set "RT4-TX AF monitor " to "ON". (Refer to "Setting RT" inSection 3 "System setting" on Page 3-6.)

Refer to Section 3.3 for the procedure. Note that the handset of the main unit cannot bemonitored even if the TX AF monitor is made ON.

After all the AF LINE inputs have been confirmed, return the setting to OFF.

Remarks) When confirming the AF line for DSC, change VHF power to "reduced" andconnect a dummy load of 50- Ω to TX ANT.Compose a message and call by assuming that the message is individual call,the category is routine, and the address is the ID number of the own ship.

6-8

6.4 Guidelines for troubleshooting

Remarks) Before starting inspection :1. Confirm that the input voltage is DC 21.6 - 31.2 V.2. Check the cable connection with external devices and connectors in the main unit.3. Practice self-test.

A high voltage is applied in the apparatus. When checking inside, be sure to turn off the power supply.

Warning

1

2

Power is not turned on.

Transmitting output is much reflected.

1. The power input voltage is too low (less than 18 V), or too high (more than 32 V).

2. The power breaker is off.

3. The power circuit board is defective.Confirmation)

• Check the power switch.• Check the output voltage. (+15V)

4. The output lines from the power board (+15 V) is short-circuited.Confirmation)

• Disconnect external devices.• Disconnect the power supply connectors

in the main unit one by one.

1. The coaxial cable connector of the transmitting ANT is defective.

2. The coaxial cable of the transmitting ANT is defective.

3. The transmitting ANT is defective.Confirmation)

• Replace it with the receiving ANT and compare.

4. Location of the transmitting ANT is bad.Confirmation)

• Check whether the location is close to other structural objects or not.

Adjust it to the specified value.

Check the breaker on the rear of the main unit.

Exchange the power board.

Repair the short-circuited portion, or exchange the short-circuited board.

Check bad contact of the coaxial cable connector and soldering. Rectify them.

Check any leak of water. Exchange the cable, if any.

Exchange the ANT.

Change the location of antenna.

Possible causes RemediesSymptomsNo.

The mark * indicates a NG or error message in self-test.

6-9

3

4

5

6

The difference in output power is big between DUP and SIMP* DX-8700 : NG* TRANSMIT POWER : NG

The transmitting range is short.

The transmitting power does not output.

Modulation does not work.1. Main unit handset2. Wing handset3. Remote4. DSC

1. The duplexer is defective.Confirmation)

• Check that the difference in power data between DUP and SIMP is less than 100.

2. The duplexer switching circuit is defective (bad contact of K1 and K2 of CH70 RX board).

1. The transmitting power is low.Confirmation)

• Check that the power is the rated value of 25 W.

* TRANSMIT POWER : NG

2. The power loss in DX-8700 is big.Confirmation)

• Compare the transmitting output from the main unit and that from DX.

* DX-8700 : NG

3. The transmitting PA module IC (U1: M57710A) is defective.


4. The Location of the transmitting ANT is bad.

1. The transmitting synthesizer PLL circuit is defective.Confirmation)

• Check that the CR11 on the TX board is off, UN-LOCK. (TX PCB: PLL Lock)

2. The PA IC module or the transmitting amplifier circuit is defective.


1. The main unit handset is faulty, or the modulating circuit on TX board is defective.Confirmation)

• Check, with line monitor function, whether the signal is coming in or not.

2. The wing handset is faulty, or the modulating circuit on TX board is defective.Confirmation)


• Check the MIC SELECT circuit on CONTROL board with carbon and dynamic microphone.

3. The remote station RB-700 is faulty, or the modulating circuit on TX board is defective.Confirmation)


4. The CONTROL board is faulty, or the modulating circuit on TX board is defective.Confirmation)• Check, with line monitor function, whether

the signal is coming in or not.

Exchange the duplex unit.

Exchange the CH70 RX board.

Adjust the power. (Refer to "Setting PO" in Chapter 3 "System setting".)

Check about Symptom 2.

Exchange the PA module or the TX board.

Check about no. 4 in Symptom 2.

Exchange the TX board.

Exchange the TX board.

Exchange the main unit handset, or exchange the TX board.

Exchange the wing handset, or exchange the TX board if the monitoring is possible.

Exchange the RB-700, or exchange the TX board if the monitoring is possible.

Exchange the CONTROL board, or exchange the TX board if the monitoring is possible.


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7

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Receiving sensitivity is bad.

Receiver noise does not come out if SQ is OFF.Remark) SQ is not AUTO.

Receiving on CH70 is bad.* DSC cannot be

received.

Keyboard does not work.

Remote function does not work.* VHF is controlled through DSC.

Printer does not work.

1. The receiving ANT system is faulty.Confirmation)EReplace the transmitting ANT with the receiving ANT and compare in the same manner as no. 1, 2, 3, 4 in Symptom 2 .

2. The duplexer is defective if DUP and SIMP channel is different in receiving sensitivity.

3. The receiving circuit is faulty.

1. The receiving AF amplifier circuit is defective.Confirmation)

• Check it with EXT SP.• Check it with handset SP.• Check it with INT SP.

2. The audio volume is defective.

3. SQ circuit is faulty. SQ volume is defective.

4. The receiving synthesizer PLL circuit is defective.Confirmation)

• Check that the CR2 on the RX board is off and UN-LOCK.

* RX PCB: NG

1. The receiving ANT system is faulty.Confirmation)

• Replace the transmitting ANT with the receiving ANT and compare in the same manner as no. 1, 2, 3, 4 in Symptom 2 .

2. CH70 RX board is defective.Confirmation)

• Practice self-test.* CH70 RX PCB: NG

1. The panel board or CONTROL board is defective if all keys do not work.

2. The panel board is defective if specific keys do not work.

Communication between the CPU for VHF and the CPU for DSC is faulty. TYPE 1: No change to in TYPE 2: No ack/time out TYPE 3: No initializationRefer to Section 6.3 "Error messages"

Main unit, the printer, or IF-8500 is defective.Confirmation)

Check the printer itself whether it is regular or not. If installed, check whether the IF-8500 is normal or not, by way of NBDP, MF/HF DSC, and IF-8500.

Remedy as Symptom 2.

Exchange the duplexer.

Exchange the RX board.

Exchange the RX board if no noise comes out in all cases.

Exchange the audio volume.

Exchange the RX board. Exchange the SQ volume.

Exchange the RX board.

Remedy as Symptom 2.

Exchange the CH70 RX board.

Exchange the panel board or CONTROL board.

Exchange the panel board.

Clear the RAM and EEROM, and if the function does not recover, exchange the CONTROL board.

Refer to Section 5.5 "NMI switch" for clearing RAM and EEROM.

Exchange the CONTROL board.


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6.5 Board compatibility

Board compatibility exists between FM-8500 and FM-8700 as below.

TypePC Board

FM-8700 FM-8500Compatibility Remarks

Power Board 05P0617 05P0617 Yes

Panel Board 05P0615 05P0615 Yes

FM-8700→8500:Yes

TX Board 05P0618A 05P0618FM-8500→8700:No

05P0616A 05P0616CONTROL Board

JP-3, 4 (w/jumper) JP-3, 4 (w/o jumper)Yes Board level must be

–33 and above.

DSC ROM U4: 05501-92-10X U4: 05501-82-10X No M27C4001

VHF CPU U2: 05501-93-10X U2: 05501-83-10X No HD642538CP/H8

Location of parts on CONTROL board

U2: VHF CPU

U8: EEROM

U4: DSC ROM

BATT

JP-4JP-3

05P0616A

FM-8500: No Jumper FM-8700: Jumper

No Jumper Jumper

The CONTROL board 05P0616 can be changed to 05P0616A, by putting jumpers on JP3and JP4, and changing DSC ROM and VHF CPU.

Fm8700 Sme A

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