Manual: CD491 SM HARMANKARDON EN

The Harman Kardon

Model CD491 _ Manual No. 66A

ULTRAWIDEBAND LINEAR PHASE CASSETTE DECK

echnical Manual

240 CROSSWAYS PARK WEST. WOODBURY. N.Y. 11797 1112-H15266A1 P-08836 250 PRINTED IN JAPAN.

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CcD4: SPECIFICATIONS

Track Configuration Cassette Deck

@MECHANICAL SECTION Nominal Limit

Record/Playback Tape Speed Deviation 4.75cm/sec. 0.3% aie

Drift 4.75cem/sec. 0.2% < 0.5% Wow and Flutter

0.033% (CCIR) =0.1%

4-track 2 channel Stereo

0.025% (NAB) = 0.038%

Take Up Torque 55gem + 35~ 70gcem

Back Tension 6gem 4.5 ~ 8gem

F.FWD Torque 120gem 90 ~ 150gcem

REW. Torque 110gem 90 ~ 150gem F.FWD/REW. Time

for C-60 Cassette 72 sec. =85 sec. Motor Direct Drive motor (Capstan)

2 Flat Torque DC motors

(Reel & Assist)

@AMPLIFIRE SECTION Bias Frequency 105kHz + 5kHz

Record/Playback Sensitivity (Input 400Hz) 580mV + 1dB

Signal-to-Noise Ratio at LINE input

(input 1kHz, 100mV) Dolby NR OFF LN 50dB

CrO2 53dB

Metal 52dB

Dolby NRBtoON LN 59dB

CrOz = =61dB=58dB Metal 60dB= 58dB

Dolby NRCtoON LN 69dB

CrO2 71dB = 66dB

Metal 70dB=66dB

Nominal Limit

Signal-to-Noise Ratio at MIC input (Input 1kHz, 1.5mV) Dolby NR B to ON (LN) 50dB= 46dB Dolby NR C to ON (LN) 57dB

Channel Separation 43dB = 35dB Crosstalk. 72dB = 60dB

Record/Playback Distortion

(Input 1kHz) LN 1.3% <1.6%

CrO2 1.0% =3.0%

Metal 1.0% =1.6% MPX Filter Attenuation

at 15kHz 0.3dB <1dB at 19kHz 35dB =30dB

Erase Ratio

(Input 80Hz) LN 70dB = 60dB

Metal 65dB=60dB Input Sensitivity (Input 1kHz)

at MIC input 0.65mV_ —0.2(min) ~ 1.0(max)mV at LINE input = 33mV =. 25(min) ~ 50(max)mV

Input Impedance (Input 1kHz)

at MIC input 1.3kQ. 1(min) ~ 2(max)kQ at LINE input = =23kQ2._—-19(min) ~ 30(max)kQ.

Overload at MIC input (Input 1kHz) 80mV =20mV

DIMENSIONS (WxHxD) 17-7/16"x4-13/16"x13-9/16” (443 x 123 x 345mm)

@WEIGHT 15 Ibs. 14 oz. (7.2 kg)

POWER SUPPLY

U.S.A, & Canada models = AC120V, 60Hz General model AC100/120/220/240v,

50/60Hz POWER CONSUMPTION

U & Canada models 5S5W General modet 60w

PLAYBACK FREQUENCY RESPONSE TEST TAPE: TCC-162C, TCC-262C

+608

RECORD/PLAYBACK FREQUENCY RESPONSE ‘TEST TAPE: XL-1, AC-512, AC-711 DOLBY NR: TYPE B ON 308 308 408

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. ‘ 308 308

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RECORD/PLAYBACK FREQUENCY RESPONSE RECORD/PLAYBACK FREQUENCY RESPONSE TEST TAPE: XL-1, AC-512, AC-711 TEST TAPE: XL-1, AC-512, AC-711 DOLBY NR: OFF DOLBY NR: TYPE CON

+30B 4348 +408 +408

oO 0 o

248 308 | sae 308 aHe are ns aate wave ‘20Hz 63H ‘315H2 kHz 16kHz

Fig.b Fig. d

Specifications and components subject to change without notice. Overall performance will be maintained or improved.

This specification is the target of servicing. But, there is a case that the specification is not applicable to the measurement

condition and instrument.

LEAKAGE TEST

Before returning the unit to the user, perform the following safety checks: 1. Inspect all lead dress to make cer-

tain that leads are not pinched or

that hardware is not lodged be-

tween the chassis and other metal Parts in the unit.

2. Be sure that any protective devices such as nonmetallic control knobs, insulating fishpapers, cabinet backs, adjustment and compartment cov- ers or shields, isolation resistor-

capacity networks, mechanical in-

sulators, etc. which were removed for servicing are properly reinstalled.

3. Be sure that no shock hazard exists; check for leakage

current using Simpson Model 229 Leakage Tester,

standard equipment item No. 21641, RCA Model

WTS540A or use alternate method as follows: Plug the AC line cord directly into a 120-volt AC

receptacle (do not use an Isolation Transformer for this test). Using two clip leads, connect a 1500 ohm,

10-watt resistor paralleled by a 0.15mf capacitor, in series with all exposed metal cabinet parts and a

known earth ground, such as a water pipe or conduit,

Use a VTVM or VOM with 1000 ohms per volt, or

higher, sensitivity to measure the AC voltage drop

across the resistor. (See Diagram.) Move the resistor connection to each exposed metal part having a

return path to the chassis (antenna, metal, cabinet,

screw heads, knobs and control shafts, escutcheon,

etc.) and measure the AC voltage drop across the resistor. (This test should be performed with the power switch in both the On and Off positions.)

A reading of 0.35 volt RMS or more is excessive and indicates a potential shock hazard which must be corrected before returning the unit to the owner.

Dolby* HX-Professional Headroom Extension (HX-PRO) System The CD491 is equipped with the Dolby HX-Professional Headroom Extension system (HX-PRO). It operates only during the record mode and does not require the user to “turn it on” or make adjustments. It is compatible with any low noise (standard), chromium dioxide (CrO2), or metal audio cassette tape.

The effect of HX-PRO is that is extends the high frequency saturation (overload) level of the tape being recorded. Therefore, many of the high level, high frequency music signals that would be compressed or distorted with a conventional cassette deck will be recorded accurately by the CD491.

ae advantages of HX-PRO are: 1. The performance of low noise and chromium dioxide

tapes almost equals that of the more expensive metal tapes. A major improvement is made in high frequency dynamic range.

3. The higher record levels result in an increased signal- to-noise ratio.

4. No decoding is necessary. The improved recording accuracy can be appreciated with any high quality tape player, including a portable or car stereo unit.

5. It can be used with or without Dolby B and C noise reduction circuitry.

N

TO EACH EXPOSED METAL SURFACE OF UNIT UNDER TEST

TO EXPOSED METAL PARTS

Response (dB)

—40 1000 20005000 10000-20000 50000

SIMPSON MODEL 229 ETC, FOR LEAKAGE TEST

TO AC GROUND SUCH AS WATER OR GAS PIPE,

HIGH BX CABLE, CONDUIT, ETC. VOLTAGE OR +LEAD

LEAD

OAC SCALE O

0.15 MF

TEST PROBE

CONNECT TO KNOWN EARTH GROUND

Hx-PAOs Day CON! J

HXPROON, Dowy COFF

WXPRO & Dolby C OFF

Frequency (Hz) Frequency Response |

“Noise reduction and headroom extension manufac- { tured under license from Dolby Laboratories Licensing Corporation. HX Professional originated by Bang and Olufsen. “Dolby” and the double-D symbol are trade- marks of Dolby Laboratories Licensing Corporation.

DISASSEMBLY PROCEDURES (REFER TO PAGES 17, 18, 19 AND 30)

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CABINET TOP REMOVAL. Remove 6 screws @ and remove the cabinet top.

FRONT PANEL ASSEMBLY (103) REMOVAL 1, Remove the cabinet top. (Refer to step [1] .) 2. Pull off Master Fader, Output Level, Mic. Level

and Rec. Level knobs (105 and 152). 3. Remove 6 screws © and remove the front panel

assembly (103).

LOGIC CONTROL P.C.BOARD(PCB-2) REMOVAL 1. Remove the cabinet top. (Refer to step [1] .) 2. Disconnect J801, J802, J803, J808 and J809

from P801, P802, P803, P808 and P809 on the logic control P.C. board (PCB-2).

3. Open the lid of connectors (P804, P805, P806 and P807) on the logic control P.C. board (PCB-2) and disconnect the lead wires.

4. Unsolder the lead wires connected to the logic control P.C. board (PCB-2).

5. Remove 4 screws @ and remove the logic control P.C. board (PCB-2) with heat sink (301),

PUSH SWITCHES P.C.BOARD(PCB-4) REMOVAL 1, Remove the cabinet top. (Refer to step [) .) 2. Open the lid of connectors P451, J803, P804

and P401) on the main, logic control and VR P.C. boards (PCB-1, PCB-2 and PCB-3) and disconnect the lead wires.

3. Remove 3 screws ®and remove the push switches P.C. board (PCB-4) with rec. cal P.C. board (PCB-9). If necessary, unsolder the lead wires.

MAIN P.C. BOARD (PCB-1) REMOVAL 1, Remove the front panel assembly, logic control

P.C. board (PCB-2) and push switches P.C. board (PCB-4). (Refer to steps [2] through I .) Disconnect J501 and J503 from P501 and P503 ‘on the main P.C, board (PCB-1).

3. Open the lid of connectors (P201, P202, P251, P301, P502, P551 and P601) on the main P.C. board (PCB-1) and disconnect the lead wires.

4, Unsolder lead wires connected to the main P.C, board (PCB-1).

5. Remove 2 screws @and remove the tape monitor switch (SW406).

6. Remove 8 screws @ and remove the main P.C. board (PCB-1).

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cout DESCRIPTION @ MPX/DOLBY NR CIRCUIT

The MPX filter circuit is turned on and off by the MPX filter switch. When it is off, the signals bypass the circuit. The dolby circuit is turned on and off by the dolby NR switch, and selected B and C types by the dolby NR type selector. When the circuit is on and type selector is B position, B-type dolby equalization is applied so that the signal is compressed during recording and expanded during playback.

MUTING . PLAYBACK MODE When the play button is pressed, the muting signal for the playback mode (which cuts the recording signal) is output from () pin of the 4 bit micro computer 1C851 and applied to Q701 (left channel) and Q702 (right channel). This turns on Q701 and Q702 to mute the recording signal.

2.

3.

VR P.C, BOARD (PCB-3) REMOVAL 1. Remove the front panel assembly. (Refer to step

2.) 2, Remove 6 screws @ and remove the cabinet

bottom assembly (102). 3. Remove 4 hexagon nuts @ mounting the VR

P.C. board (PCB-3) and remove it.

CASSETTE TAPE RECORDER MECHANICAL ASSEMBLY (113) REMOVAL 1, Remove the front panel assembly and logic

control P.C. board (PCB-2). (Refer to steps (2) and (3) .)

2. Remove 4 screws @ and remove the cassette tape recorder mechanical assembly (113) with plate assembly (104) backward.

PLATE ASSEMBLY (104) REMOVAL 1, Remove the cassette tape recorder mechanical

assembly. (Refer to step [2 .) 2. Remove 2 screws @ and remove the plate

assembly (104).

DIRECT DRIVE MOTOR (506) REMOVAL 1, Remove the plate assembly. (Refer to step 2. Remove 2 hexagon nuts @

direct drive moto?. lead wires.

) and remove the

If necessary, unsolder the

PAD ASSEMBLY (505) REMOVAL 1, Remove the plate assembly. (Refer to step 5} .) 2, Remove 2 screws @ and remove PAD assembly.

If necessary, unsolder the lead wires.

IDLER MOTOR ASSEMBLY (503) REMOVAL 1, Remove the direct drive motor. (Refer to step

) 2, Remove 2 lock washers ({) and remove supply

and take-up reel spindle assembly (508 and 509). At this time, remove the belt (511) and spring (507).

3. Remove 3 screws @® and remove the idler motor assembly.

HEAD BASE ASSEMBLY (502) REMOVAL 1, Remove the direct drive motor. (Refer to step

) 2. Remove 2 E-stop rings ® and remove supply and

take-up pinch roller assembly (516 and 513). 3. Remove the lamp holder assembly (519) and

lamp holder mounting bracket. 4, Remove 2 E-stop ring @ and remove head base

assembly with record/playback and erase heads.

RECORDING MODE When the record button is pressed, the muting signal for the record mode (which cuts the playback signal) is output from @ pin of 1C851 and applied to 091 (left channel) and Q92 (right channel). This turns on Q91 and 092 to mute the playback signal.

LINE MUTE (POWER SWITCH ON/OFF) When the power is turned on, 051 is turned on for a few seconds. At the same time Q93 and Q94 go on. @ pin of the 4 bit micro computer 1C851 becomes high level. The computer is reset. At the same time Q91 (left channel) and Q92 (right channel) are turned on. Thus, no shock noise is output to the OUTPUT terminals.

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Bias Fine Trim Feature

The optimal amount of recording bias varies from tape to tape. The bias fine trim feature is provided to enable precise adjustment for such variations.

‘The high frequency range tends to be attenuated if the

bias current is higher than the optimum value while it

tends to be boosted if the bias current is less than the optimum value. Less than optimum bias also increases the amount of distortion in a recording.

This unit assists the user in determining the precise amount of bias, and therefore in obtaining the widest and flattest frequency response.

Operate as follows: 1. Insert a cassette tape in the CASSETTE COMPART-

MENT and press the TAPE SELECTOR button corre-

sponding to the type of tape being used. 2. Depress the TAPE MONITOR switch and make

certain that the TAPE MONITOR indicator illumi-

nates.

3. Press the RECORD and PLAY buttons together to

start recording.

4. Hold the BIAS TONE button in. A 400Hz signal and

a 12.5kHz signal are recorded in the left and right channels, respectively.

. Compare the left and right channel PEAK LEVEL

METER readings. If the amount of bias is optimum,

the left and right channels will have the same reading. Turn the BIAS FINE TRIM knob counterclockwise

(toward the direction marked as HI CUT) if the right

channel reading exceeds the left channel reading or

clockwise (toward the direction marked as Hi

BOOST) if the left channel reading exceeds the right

channel reading.

a

If the right channel reading exceeds the left channel reading:

BIAS FINE TRIM

Turn the knob counterclockwise.

|f the left channel reading exceeds the right channel

reading:

BIAS FINE TRIM

MOT peut 4ni boost

Turn the knob clockwise.

Record Calibration Feature

Each tape has different sensitivity. As a result, a tape

that is recorded at a OdB level may have a playback level

that is either higher or lower than OdB. The record

calibration feature enables the user to precisely adjust

the record/playback level so that both modes correlate,

This is especially important when making Dolby NR

encoded recordings.

Operate as follows: 1, Insert the. cassette tape to be recorded into the CAS-

SETTE COMPARTMENT. Press the TAPE

SELECTOR button according to the tape type.

2. Press the TAPE MONITOR switch and make certain

that the TAPE MONITOR indicator illuminates, 3. Press the RECORD and PLAY button together to

start recording.

4. Hold in the RECORD CALIBRATION button. A

400Hz signal is recorded on each channel.

. If the PEAK LEVEL METERS show OaB, no adjust-

ment is required. If the indicated level is above or

below OdB, adjust the RECORD CALIBRATION

control{s) of the left and right channels using a the screwdriver provided with your unit. If the indication

of the PEAK LEVEL METER is below OdB, turn the

RECORD CALIBRATION control clockwise to adjust to OdB. If the PEAK LEVEL METER reads above OdB, turn the RECORD CALIBRATION

control counterclockwise.

a

If the indication is below OdB.

ene (even METER cee cal left right SSCS) ur ae

i oo i mat

Turn the controls clockwise,

\f the indication is above OdB.

Peak LeveL METER 06 cal left right ©

‘Turn the controls counterclockwise.

NOTE: Adjustment to OdB may be impossible if the

tape used is old or of poor quality.

ALIGNMENT PROCEDURES (REFER TO PAGES 29 AND 30)

= ELECTRICAL ADJUSTMENT 1. Before adjustment 3. TEST TAPE

( ©@ After the power switch is pushed on, wait for 10 © Azimuth adjustment ............. MTT-114

minutes before measuring to be sure of the most © Tape speed adjustment . . MTT-111 or MTT-111D Dolby NR off stable operation. © Playback amp. level adjustment ............. MPX Filter off

®@ Since head magnetization, dust accumulations, etc. ee eee eee eee MTT-150 or TCC-130 Tape Monitor source are likely to introduce errors in the various charac- @ Playback frequency characteristic confirmation Bias Fine Trim center

teristics, it is very important that the heads are TCC-162C and TCC-262C Timer off

Properly demagnetized and cleaned before © Auto search adjustment . . MTT-150 Output Level

commencing any adjustment, particularly frequen- © Auto search confirmation......... MTT-250B Oren = ‘ cy response and head azimuth adjustment. Reference tapes Mic. Level off % LN.... oe XL Rec. Level max 5 2. INSTRUMENTS REQUIRED CrO2 «+ AC512 Master Fader max

© Low frequency oscillator Metal ........ AC-711 @ AC VTVM or dual channel AC VTVM Note: ®@ Oscilloscope C-90 differs with C-60 in the thickness and bias is © Wow/flutter meter unequal, so adjust with the tape whose bias is of © Frequency counter specified value.

( Mi EES

VTVM TP501 or | Azimuth ; Refer to “Azimuth adjustment” eds Test tape (MTT-114)_| PB TP502 screw Maximum sutpat on page 12. Frequency counter F i P8501 or VR built +30 7 Tape speed Test tape (MTT-111 PB ee VE allt kHz *30 Hz

" viva Playback amp. 7P501 vrio1 Test tape(MTT-150 | PB 580mV level ert tape (mt TP502 VR102

: Peacace frequency, YINM Confirm that frequency hi : C Poeteaet td See Bee CG eRe. || ag LINE OUTPUT response is within the C range in Fig. a. i vive Set the auto search mode. Auto search Test tape (MTT-150) | PE TP761 A761 tomy Tape selector is CrO2 position.

‘Auto search ; Refer to “Auto search operation ot seh. Test tape (MTT-2508) confirmation” on page 9. naar Tape selector is metal position.

eee: TP203 res) Set the bias fine trim to hi cut Step up trans. vtvm proce te Maximum output position. TP204 rd Set VR256 and VR257 all the way

to counterclockwise. Tape selector is metal postion. ; et the bias fine trim to hi cut Bias trap vTvM Gee aba tae Minimum output position. Set VR256 and VR267 all the way to counterclockwise.

7P203 VR287 Tape selector is metal position. TP204 VR256 omy. < j ee

Bias level REC. 76203 VR255 ; Teecaesneail vive aes Teas yaaa 22mV Tape selector is CrO2 position.

pice veaes 13mVv Tape selector is LN position.

Biles Trequency Frequency counter Bae 1P251 105kHz + SkHz Tape selector is metal position. Apply 400Hz signal to LINE INPUT. Set REC Record level vtvm REC/PB TP501 vR201 P an, ; LEVEL knob so that TPS61 and TPS62 voltage s80mV Tape selector is CrO2 position. (Pre-adjustment) Blank tape (AC-512) EME E knob so thet Teee | ond TP502 vR202

Par Apply 27kHz signal to LINE INPUT. Set REC Peaking coil REC- 7P201 L201 ‘ Short the TP251 and TP26 9 v 5s (Pre-adjustment) Tea PAUSE HOSOI eee ee eae ag voltae 7P202 L202 Maximum output Tape selector is metal position.

VA257 So that the record/playback L201 frequency response is flat , a LINE OUTPUT |—jaoee lat least within whe faivoe Tape selector is metal position. ( Ne in Fig. b.)

vtvM Apply 400H2 signal to LINE INPUT. Set REC pecata/Ptaybork Blank tapes RECRE LEVEL knob so that TP661 and TPS62 voltage zoe So that the record/playback

metal AC-711 is 680mV —25dB in REC-PAUSE mode. LINE OUTPUT frequency response #3 Tr T lector i ition. frequency CrO2 AC-512 Then adjust with a 20Hz to 30kHz sweep VR254 {at least within the range ae Solero. C02 Pesren characteristic rote cate seals L202 in Fig. b.) yess So that the record/playback R253 frequency response is flat i ts \ LINE OUTPUT | Vroes (reer Cathie ahs cos Tape selector is LN position.

in Fig. b.)

ALIGNMENT PROCEDURES (REFER TO PAGES 29 AND 30)

= ELECTRICAL ADJUSTMENT 1. Before adjustment

@ After the power switch is pushed on, wait for 10

minutes before measuring to be sure of the most stable operation.

@ Since head magnetization, dust accumulations, etc.

are likely to introduce errors in the various charac-

teristics, it is very important that the heads are

properly demagnetized and cleaned before

commencing any adjustment, particularly frequen-

cy response and head azimuth adjustment.

2. INSTRUMENTS REQUIRED

@ Low frequency oscillator

AC VTVM or dual channel AC VTVM

Oscilloscope

3. TEST TAPE © Azimuth adjustment .........025- MTT-114 © Tape speed adjustment . . MTT-111 or MTT-111D © Playback amp, level adjustment ........ 0000.

erie aicntenatceart yack hear MTT-150 or TCC-130 © Playback frequency characteristic confirmation

ehh PUA deg ban Me TCC-162C and TCC-262C © Auto search adjustment ........... MTT-150.

© Auto search confirmation......... MTT-250B Reference tapes LN... XL-1

CrO2 AC-512

Metal . AC-711 Note:

C-90 differs with C-60 in the thickness and bias is

unequal, so adjust with the tape whose bias is of

. e © Wow/flutter meter @ Frequency counter specified value.

; VIVM ? “TP5O1 or Aaimatty Test tape (MTT-114) | PB TP502

Frequency counter Tape speed Test tape (MTT-111 PB aeeoL or

or MTT-111D) viv

Playboy am: Test tape (MTT-150 PB pee or TCC-130)

Playback frequeney viv ic Test tape (TCC-162C “i and TCC-262C) Fe CINE‘OUTRUT:

viv Auto search Yor oeimTt-i6o) | PB 1P751 ‘Auto search ile eae Test tape (MTT-250B)

TP203 REC. Step up trans. viv ie aay

F REC- 7P201 Bias trap vtvM re Teoh

7P203 TP204

Bias level REC. TP203 (Pre-adjustment) NIV PAUSE TP204

TP203 TP204

Bias frequency REC. Bi frequen Frequency counter Bas TP251 atcag ioe 7) RECIPE ‘Apply 400Hz signal to LINE INPUT, Set REC TpeOi (Pre-adjustment) Blank tape (AC-512) OE Ta RUC eee TP5O2

ae : Apply 27kHz signal to LINE INPUT. Set REC Venicing coll vtvM Lara LEVEL knob so that TP101 and TP102 voltage eae

i is S80mV —26dB in REC-PAUSE mode.

LINE OUTPUT

viv Apply 400Hz signal to LINE INPUT. Set REC Berea ence Blank tapes RECIPE LEVEL knob so that TP561 and TP562 voltage ecrusiizs metal AC-711 is 580mV ~26dB in REC-PAUSE mode. LINE OUTPUT paver CrO2 AC-512 Then adjust with a 20Hz to 30kHz sweep characteristic ord oa vacate

‘ LINE OUTPUT

© General conditions (unless otherwise noted).

MPX Filter

Tape Monitor

Bias Fine Trim

Timer

Output Level

Mic. Level

Rec. Level

Master Fader

off

off

source center off

max off

max max

Refer to “Azimuth adjustment” 7 ‘Azimuth ; Balen Maximum output isietorh

r VR built +30 in motor kHz “age

vator Wilt 580mV

Confirm that frequency PUT response is within the

range in Fig. a.

‘oom Set the auto search mode, MBEY ‘loom: Tape selector is CrO2 position.

Refer to “Auto search operation confirmation” on page 9.

L661 Tape selector is metal position. he Set the bias fine trim to hi cut ho Maximum output position. on Set VR256 and VR257 all the way

to counterclockwise. Tape selector is metal position,

ions Set the bias fine trim to hi cut toe Minimum output position.

Set VR256 and VR257 all the way to counterclockwise.

VR257 Tape selector is metal position. VR256 spy 3

vate 22mv Tape selector is CrO2 position.

ynees 13mV Tape selector is LN position.

105kHz + SkHz Tape selector is metal position.

year 580mV Tape selector is CrO2 position.

L201 ; Short the TP251 and TP252. 202 Maximum'output Tape selector is metal position.

VR257 So that the record/playback L201 frequency response is flat , - PUT | aoeg (et leost within tha ranae Tape selector is metal position. vgs in Fig. b.)

Atte So that the record/playback frequency response is flat , 4

[rPUT VR254 (at least within the range Tape selector is CrO2 position.

202 in Fig. b.) So that the record/playback

R253 frequency response is flat , TPUT | R252 {at least within the range “Tape selector IsLN posizion.

in Fig. b.)

Apply 400Hz signal to LINE INPUT. coed tl vivm REC/PB Set REC LEVEL knob so that TP561 and TP562 | TP501 VF ene Blank tape (AC-512) voltage is S80mV in REC-PAUSE mode. Then TP502 VF

adjust with a 20Hz to 30kHz sweep signal. vivm Apply 400Hz signal to LINE INPUT.

Record level Blank tapes REC/PB Set REC LEVEL knob so that TP561 and TP562 | TP501 confirmation metal AC-711 voltage is S80mV in REC-PAUSE mode. Then TP502 LN xLA adjust with a 20Hz to 30kHz sweep signal,

Apply 250Hz signal to LINE INPUT. bata VTVM REC/PB Set REC LEVEL knob so that TP561 and TP562 | TP5O1 u jeyback: trap. Blank tape (XL-1) voltage is 25dB below 580mV in REC-PAUSE TP502 u mode.

een pleybant pele Apply 400Hz signal to LINE INPUT. uciene, ba fal AC TIT REC/PB Set REC LEVEL knob so that TP561 and TP562 Heo te Con eesie voltage is 25dB below 580mV in REC-PAUSE LINE OUTPUT

Chatmcteristie A mode, Then adjust with a 20Hz to 30kHz sweep confirmation tn xL4 Ganar

Apply 400Hz signal to LINE INPUT. REC- Set REC LEVEL knob so that TP561 and TP562 VF Meter: level ve PAUSE voltage is 0.5dB below 580mV in REC-PAUSE VF mode.

Record calibration REC- TPS61 tone level NIYM PAUSE TP562 bk

7 REC- TP561 VR Bias tone viv RAUSE Aly ve LED display lighting 3 level of record calibra- ine tion tone confirmation LED display lighting 7 level of bias tone Broa confirmation MPX filte Bee Apply 15kHz and 19kHz signal to LINE INPUT. characteristic PAUSE Set REC LEVEL knob so that TP561 and TP562 | LINE OUTPUT confirmation voltage is 580mV in REC-PAUSE mode.

P - Apply 19.9kHz signal to LINE INPUT. Set REC eoruaten a VTVM A uee LEVEL knob so that TP561 and TP562 voltage oes ever contra is 25dB below S80mV in REC-PAUSE mode. Apply 19.9kHz signal to LINE INPUT. Set REC Boost level 7P501 Conte vtvm PB LEVEL knob so that TP501 and TP502 voltage TPS02 is 25dB below 580mv.

foo. veeor 580mV Tape selector is CrO2 position.

P5O1 2 This confirmation should be done P502 PaO = 0.08. at each tape selector position.

P01 L101 : Tape selector is LN position. P502 L102 Minimum output Dolby NR Cis on.

: Confirm that record/playback frequency response is This confirmation should be done at within the range in Fig. c each tape selector position under

NE OUTPUT and Fig. d. If itis not within | each of the following conditions, the specification, redo the Dolby B and Dolby C on. adjustment and confirmation on steps 13, 15 and 16.

Adjust to the point where Masedd the OVU LED of the LED

display lights. t Keep pressing the REC CAL button. PS61 Adjust balance if there is a difference P562 YEAS Bala: in output between the R and L

channels, P561 VRa51 7 Keep pressing the BIAS TONE P562 vR452 Beomy:—20de: button.

Refer to “LED display light level confirmation” on page 9.

Same as above.

Confirm that attenuation of NE OUTPUT 18kHz and 19kHz is within : the specification.

_ Maximum output Dolby NR Cis on.

P50 P502 Maximum output Dolby NR Cis on,

PF ig Set viv REC/PB REC LEVEL TP501 va201 7

Record evel Blank tape (AC-512) voltage is 580mV in REC-PAUSE mode. Then ‘TP5O2 R202 BeOmy) (Tape selectors C192 Rosition: adjust with a 20Hz to 30kHz sweep signal.

VIVM ‘Apply 400Hz signal to LINE INPUT. Record level Blank tapes REC/PB Set REC LEVEL knob so that TP561 and TPS62 | TPSot eaom¥O.bde This confirmation should be done confirmation metal AC-711 voltage is S80mV in REC-PAUSE mode. Then 7P502 #08 at each tape selector position.

LN xt adjust with a 20Hz to 30kHz sweep signal. fase Apply 250Hz signal to LINE INPUT. +

vTvM Set REC LEVEL knob so that TP561 and TP562 | TPSO1 L101 , ape selector is LN position. Playback: tap Blank tape (XL-1) voltage is 25dB below 580mV in REC-PAUSE TP502 L102 Minimum output Dolby NR Cis on.

; mode. 4 ; Confirm that record/play- ; Record/playback viv , back frequency response is This confirmation should be done at i equalizer Blank tapes REGIS: Pcie suc keidertie erent ee ee within the range in Fi each tape selector position under i frequency metal AC-711 ee ae chy hun Rabin HEC eAtiSe LINE OUTPUT and Fig. d. If it isnot within | each of the following conditions,

characteristic Croz— AC-512 rrdde Than 'ediuct tinthr # 20be tw SURF > ores : the specification, redo the Dolby B and Dolby C on. confirmation UN x4 aon : P adjustment and confirmation

ise on steps 13, 15 and 16. ‘Apply 400Hz signal to LINE INPUT. F F

paren eau REC- Set REC LEVEL knob so that TP561 and TP562 vR401 Ma Gieberaetee xg PAUSE voltage is 0.508 below S80mV in REC-PAUSE vR402 Phat voli isplay lights. |

i iKeep pressing the REC CAL button. Record calibration REC- TPS61 Adjust balance if there is a difference tone level MIM PAUSE ‘TP562 yates, peony’ in output between the R and L

channels.

am ven Biles Te | SES [sow an Kern ASTON] LED display lighting i is EEO cleplay lighting & REC- Refer to “LED display light tion tone confirmation PAUSE level confirmation” on page 9. LED display lighting REC- level of bias tone Puce Same as above. confirmation MPX filter Eee ‘Apply 18kHz and 19kHz signal to LINE INPUT. Confirm that attenuation of characteristic PAUSE Set REC LEVEL knob so that TP561 and TP562 LINE OUTPUT 15kHz and 19kHz is within

F confirmation voltage is S80mV in REC-PAUSE mode. the specification. : ‘Apply 19.9kHz signal to LINE INPUT, Set REC

AttSRUEONL, vivm BEC. LEVEL knob so that TPS61 and TP562 voltage TP201 Maximum output Dolby NR Cis on. level confirmation PAUSE 7P202 ne consimatiot is 25dB below 580mV in REC-PAUSE mode. Apply 19.9kHz signal to LINE INPUT. Set REC

Boost level VTVM PB LEVEL knob so that TP501 and TP502 voltage areot Maximum output Dolby NR C is on. confirmation dee teat aicah TP502 | :

{

} { i

cS

=

AUTO-SEARCH OPERATION CONFIRMATION

Conditions

Test tape MTT-250B

Tape Selector CrO2z

Dolby NR off

- Wind the test tape to its end and reset the counter to “0000”.

. Press the REW key to rewind the tape until the

counter indicates around “9500”.

. Check for the following operation by pressing the:

F.FWD key and the PLAY key simultaneously.

Stop Auto-search (2 ~ 5 sec.) fee F.FWD key and ] ee indicator lights al PLAY key simultaneously. | F.FWD indicator flashes.

~>Rewind (about 0.5 sec.) —~Playback

. Repeat the same check as in step 3 a few times by pressing the F.FWD key and the PLAY key simulta-

neously.

5. With the test tape rewound fully, reset the counter to

“0000”.

6. Wind the tape on quickly until the counter indicates

around “0050” by pressing the F.FWD key.

7. Check for the following operation by pressing the

REW. key and the PLAY key simultaneously.

Stop Auto-search (2 ~ 5 sec.) Press REW.key and PLAY ] [PLAY indicator lights and key simultaneously. REW. indicator flashes.

—>Rewind (about 0.5 sec.) —~ Playback

8. Repeat the same check as in step 7 a few times by

pressing the REW. key and the PLAY key simultaneously.

LED DISPLAY LIGHTING LEVEL CONFIRMATION

Conditions (unless otherwise noted) Output Level ..... ++ Center Mic. Level ...... . . Off Bias Fine Trim .. . . - Center DolbyNR...... . Off MPX Filter ..... z . Off

Tape Monitor... .. seeee . Monitor Connect a 10k load resistors to LINE OUTPUT.

. Dolby NR light level confirmation

Play back the test tape (MTT-150) and confirm that the LED display lights to OVU with the tape selector

at both the LN position and the CrO2 position. If the

display does not operate as described above, make

a readjustment by repeating steps 3 and 18 of

Electrical Adjustment.

REC. CAL. TONE and BIAS TONE light level con-

firmation 1) With the tape monitor switch set to source and the

tape selector at the CrO2 position, set the unit in

the REC-PAUSE state. Then confirm that the LED

display lights to OVU when the REC CAL button

is pressed.

If the display does not operate as described above, make a readjustment by repeating step 19

of Electrical Adjustment.

© Test tape MTT-150 @ Reference tapes

tN XL-1 CrO2 AC-512

Metal AC-711

2) Check to ensure that the LED display lights to

OVU when the BIAS TONE button is pressed.

If the display does not operate as described above, make a readjustment by repeating step 20

of Electrical Adjustment.

3) With the tape selector at the LN and then the Metal position, check to ensure that the LED display reading does not change when the buttons are pressed as in steps 1) and 2).

10

3. Playback level and playback frequency response

confirmation of REC. CAL. TONE and BIAS TONE

1) With the tape selector set at the LN position, record the REC. CAL. TONE for more than 1

count indication of the counter. During playback, check to ensure that one of —1VU, OVU and

+1VU on the Leh of the LED display lights.

If the display does not operate as described above,

make a readjustment by repeating step 14 of

Electrical Adjustment.

Repeat the same check with the tape selector set

to the CrO2 position and then the Metal position.

The level difference with the Rch must be within 1VU.

2) As in step 1), record the BIAS TONE by pressing

the BIAS TONE button and play it back. During

playback, keep the BIAS TONE button depressed and check to ensure that one of —1VU, OVU

and +1VU on the Lch of the LED display lights.

If the display does not operate as described above,

make a readjustment by repeating step 14 of

Electrical Adjustment. The level difference with the Rch must be within

vu.

4. Recording/playback frequency response correction

confirmation by means of BIAS FINE TRIM 1) With the 2ch VTVM connected to the LINE OUT-

PUT terminals and the tape selector set to the CrO2 position, record the BIAS TONE by pressing the BIAS TONE button and play it back. Note

the output level of Lch and Rch when playing

back and suppose it as OdB.

2) Turn the BIAS FINE TRIM all the way to the

BOOST side and confirm that the output level

changes more than +2dB. Then turn it all the way to the CUT side and confirm that the output

Jevel changes less than —2dB.

3) Repeat the same confirmation procedure as in steps 1) and 2) with the tape selector set to the LN position and the Metal position respectively. The amount of the output level change should be more

than +2dB on the BOOST side and less than —-2dB

‘on the CUT side.

5. MEMORY, AUTO REWIND, AUTO REPLAY operation confirmation 1) With the AUTO REWIND and AUTO REPLAY

switches in the OFF state, load the tape and wind it up to the end by pressing the F.FWD key. Then

confirm that the AUTO STOP operation. The

unit must stop automatically about 2 seconds after

the tape was wound fully and the reel stopped.

2) With the AUTO REWIND switch ON, rewind the

tape (for any length) by pressing the REW key and

then play it back to the end. Then confirm that the AUTO STOP operates about 2 seconds after

the tape was fully wound up and the reel stopped

and at the same time the REWIND operates automatically.

3) With the MEMORY switch ON, wind the tape approximately half way, press the RESET switch

to make the counter indication “0000” and wind

the tape quickly by pressing the F.FWD key (for

any length). Then press the REW. key to rewind

the tape and confirm that the tape automatically

stops somewhere between “0000” and “9999” on the counter.

4) With the AUTO REPLAY switch ON, press the

F.FWD key to wind the tape quickly (for any length). Then press the REW. key to rewind the

tape and confirm that the tape stops automatically

somewhere between “0000” and “9999” on the counter and at the same time the REPLAY operates.

5) Furthermore, press the REW. key to rewind to the

end of the tape and confirm that about 2 seconds after the tape was fully rewound and the tape

stopped, the AUTO STOP operates and at the

same time the REPLAY operates.

= CASSETTE MECHANISM ADJUSTMENT AND CONFIRMATION

1. Pinch roller contact timing

A 1) Run the capstans by placing the POWER switch in the ON position.

2) Lift the head base slowly until the take-up pinch

roller starts rotating. Then confirm that there is a clearance of 0.05~ 0.5mm between the supply

pinch roller and the capstan.

Capstan

‘Clearance 0.05 ~ 0.5 mm

O) p—! — (\ © =

5 CLIO = Supply pinch roller ‘Take-up pinch roller

Not rotating Rotating

Fig. 1

( ; 3) If the pinch roller contact timing is simultaneous or reverse, advance the pinch roller contact timing

of the take-up pinch roller by bending the A section in the below Fig. 2 in the arrow direction

¥ or replace the supply pinch roller assembly. : Note: If the contact timing has been adjusted by

bending the A section of the head base, be

Pak sure to confirm after the adjustment that

the capstan and the take-up pinch roller are € not in contact while the deck is in the

: PAUSE mode.

Head base

Fig, 2

inch roller parallelism confirmation

1) Push up the head base until right before the

capstan and pinch roller contact and visually confirm for parallelism of each capstan and the

pinch roller. Capstan

Parallelism

Pinch roller Fig. 3

2) If out of parallelism, check the pinch arm spindle

for bend and if not bent, replace the pinch roller

assembly.

3. Specification confirmation

Check for the following specifications.

1) Back tension 6gem (4.5 ~ 8gem)

2) Pinch roller pressure Tape-up 360g + 40g

Supply 260g + 40g

4, Head height adjustment

1) Install the M-300 head gauge plate.

2) With the unit in the PLAY state, apply the

adjustment chip to the head gauge plate and make an adjustment with the adjusting screws A and B

in the below Fig. 4 so that the chip doesn’t contact the tape guide.

™-300_ Head gauge plate Adjustment chip

6 guide Adjustment

+ chip

Head gauge plate

B Fig. 4

5. Head penetration adjustment

1) Install the M-300 head gauge plate. 2) Apply the adjustment chip to the head and check

for the chip to head clearance. If there is a clearance, make an adjustment with the adjusting

screw C so that no clearance remains,

Note: 1. There should be no clearance at either record or playback head.

2. If there is a clearance at either record or

playback head, adjust so that the

clearance will be at the lower side as

shown in the Fig. 5.

3. After the flapping adjustment, re-check

‘the head height.

M-300 Head gauge plate

c Fig. 5

ahi

6. Supply pinch roller height adjustment 1) Install the M-300 head gauge plate. 2) Set the unit in the PLAY state. With the adjust-

ment chip applied to the tape guide of the supply

pinch roller, check the tape guide to chip clearance.

Make an adjustment with the adjusting screw D

in the below Fig. 6 so that the upper and lower

clearances become equal.

3) After the adjustment, repeat STOP-PLAY and re- check the height.

‘Tape Adjustment guide, chip * —_ Supply: pinch lead roller gauge plate)

7. Erase head flapping confirmation As in step 5, visually check the erase head flapping. If the clearance is large, make an adjustment by insert- ing a spacer or replace the erase head.

8. Azimuth adjustment When the maximum level point of R channel does not

equal that of L channel, connect the oscilloscope as

shown in Fig. 7 and proceed with azimuth adjustment so that L and R channels are in phase.

a) Connect L channel tape out to “X{or V)" and R

channel to “Y (or H)”’. Observe the lissajouss waveform.

b) Set L and R channels to monaural, Adjust vertical

and horizontal gain so that the waveform becomes

45 degree. c) Adjust azimuth so that the measurement of “a”

becomes maximum and the measurement of ‘b””

becomes minimum against 45 degree line.

OSCILLOSCOPE

output output

9. Tape pass confirmation 1) With the mirror cassette (MC-109C without pad)

in the PLAY state, check the tape for snaking

or curling at the side. 2) Confirm by repeating PLAY-STOP more than

twice, © Contact or curling at the tape quide

Curling must be corrected but contact is accept-

able.

© Watch carefully between the tape guide of the

pinch roller and the erase head as flapping tends

‘to occur there.

@ If flapping exists, perform checking as described

in the following 3) and on.

3) When the tape transport is unstable; a. Re-adjust the supply pinch roller height as in

step 6. Then perform the azimuth adjustment as in step 10 and check the tape transit. If the tape transit is satisfactory, check to ensure that the

erase head height is proper.

b. If the pinch roller height adjustment can not

correct the unstable tape transport, check each

part for parallelism.

® Check the capstan spindle for tilt. If it has a

tilt, try tilting the record and playback heads

in the same direction.

® If the tape flapping exists right before the erase head, eliminate it by tilting the erase head with a spacer inserted A or B between

the erase head and erase head base as shown

in the Fig. 8.

@® Check for parallelism of the tape guide of the

supply pinch roller and the capstan. If they

are not parallel, replace the supply pinch roller assembly.

@ Check for parallelism of the take-up pinch

roller and the capstan. If they are not parallel,

replace the take-up pinch roller assembly.

Note: Make sure to perform the azimuth

adjustment after each adjustment and then check the head height and flap-

ping.

Erase head

m rase head base

Fig. 8

= CASSETTE MECHANISM ADJUSTMENT AND CONFIRMATION

1. Pinch roller contact timing 1) Run the capstans by placing the POWER switch

in the ON position. 2) Lift the head base slowly until the take-up pinch

roller starts rotating. Then confirm that there is a

clearance of 0.05~ 0.5mm between the supply

pinch roller and the capstan.

Capstan

Clearance fy 0.05 ~0.5 mm

5 LI} Ae @ 6 & OO Supply pinch roller Not rotating

Take-up pinch roller Rotating

Fig. 1

3) If the pinch roller contact timing is simultaneous

or reverse, advance the pinch roller contact timing

of the take-up pinch roller by bending the A

section in the below Fig. 2 in the arrow direction

or replace the supply pinch roller assembly. Note: {f the contact timing has been adjusted by

bending the A section of the head base, be

sure to confirm after the adjustment that

the capstan and the take-up pinch roller are

not in contact while the deck is in the

PAUSE mode.

Head base

Fig, 2

2. Pinch roller parallelism confirmation

1) Push up the head base until right before the

capstan and pinch roller contact and visually

confirm for parallelism of each capstan and the

pinch roller. Capstan

Parallelism

Pinch roller Fig. 3

2) If out of parallelism, check the pinch arm spindle

for bend and if not bent, replace the pinch roller

assembly.

3. Specification confirmation Check for the following specifications. 1) Back tension 6 gem (4.5 ~ 8gcm) 2) Pinch roller pressure Tape-up 360g + 40g

Supply 260g + 40g

4. Head height adjustment


2) With the unit in the PLAY state, apply the

adjustment chip to the head gauge plate and make

an adjustment with the adjusting screws A and B

in the below Fig. 4 so that the chip doesn’t

contact the tape guide.

‘M-300 Head gauge plate Adjustment chip

Tape guide Adjustment

B Fig. 4

5. Head penetration adjustment 1) Install the M-300 head gauge plate.

2) Apply the adjustment chip to the head and check for the chip to head clearance. If there is a

clearance, make an adjustment with the adjusting

screw C so that no clearance remains. Note: 1. There should be no clearance at either

record or playback head. 2, If there is a clearance at either record or

playback head, adjust so that the

clearance will be at the lower side as

shown in the Fig. 5.

3. After the flapping adjustment, re-check

the head height.

M-300 Head gauge plate

Head Adjustment chip

WiLL ‘Head gauge

Clearance _plate

c Fig. 5

ahi

6. Supply pinch roller height adjustment


2) Set the unit in the PLAY state. With the adjust-

ment chip applied to the tape guide of the supply

pinch roller, check the tape guide to chip clearance.

Make an adjustment with the adjusting screw D

in the below Fig. 6 so that the upper and lower

clearances become equal. 3) After the adjustment, repeat STOP-PLAY and re-

check the height.

D Fig. 6

7. Erase head flapping confirmation

As in step 5, visually check the erase head flapping. If

the clearance is large, make an adjustment by insert-

ing a spacer or replace the erase head.

8. Azimuth adjustment

When the maximum level point of R channel does not

equal that of L channel, connect the oscilloscope as

shown in Fig. 7 and proceed with azimuth adjust-

ment so that L and R channels are in phase.

a) Connect L channel tape out to “X(or V)” and R

channel to “‘Y (or H)"’. Observe the lissajouss waveform.

b) Set L and R channels to monaural. Adjust vertical

and horizontal gain so that the waveform becomes 45 degree.

c) Adjust azimuth so that the measurement of “a” becomes maximum and the measurement of ‘b’””

becomes minimum against 45 degree line.

output output Fig. 7

9. Tape pass confirmation

1) With the mirror cassette (MC-109C without pad)

in the PLAY state, check the tape for snaking

or curling at the side.

2) Confirm by repeating PLAY-STOP more than twice. fe

© Contact or curling at the tape quide

Curling must be corrected but contact is accept-

able.

Watch carefully between the tape guide of the

pinch roller and the erase head as flapping tends to occur there.

© If flapping exists, perform checking as described

in the following 3) and on.

3) When the tape transport is unstable;

a. Re-adjust the supply pinch roller height as in

step 6. Then perform the azimuth adjustment as

in step 10 and check the tape transit. If the tape transit is satisfactory, check to ensure that the erase head height is proper.

b. If the pinch roller height adjustment can not correct the unstable tape transport, check each part for parallelism.

© Check the capstan spindle for tilt. If it has a

tilt, try tilting the record and playback heads

in the same direction.

® If the tape flapping exists right before the

erase head, eliminate it by tilting the erase

head with a spacer inserted A or B between

the erase head and erase head base as shown

in the Fig. 8. ® Check for parallelism of the tape guide of the

supply pinch roller and the capstan. If they

are not parallel, replace the supply pinch

roller assembly. @ Check for parallelism of the take-up pinch

roller and the capstan. If they are not parallel,

replace the take-up pinch roller assembly.

Note: Make sure to perform the azimuth adjustment after each adjustment and

then check the head height and flap-

ping.

Erase head

Erase head base

Fig. 8

13

TIMING CHART

1. STOP > F.FWD 2. STOP > REW.

REW. i =.

brew. ff

Met AMR

optay___! H ee.

RMUT o-nec..

bu __f

Cautions: 1. After AMR rises, the computer performs puls check and auto stop processing at F.FWD.

2. It performs auto stop and auto playback Processing.

3. STOP > SCAN F.FWD

eWOISCAN) —[———] relay

‘eewo___[ Turn onand off at 1H ReON Ky (One)

K; (ONL) ame j= ——-__4——

AMT onc.

Bu __t

Cautions: 1, After AMR rises, the computer performs puls check and auto stop processing at F.FWD.

2. After AMR rises, if the set is in scan F.FWD, the computer checks scan signal and performs queing processing.

Cautions: 1. After AMR rises, the computer performs puls check and auto stop processing at REW.

2. It performs auto stop and auto playback Processing.

4. STOP > SCAN REW.

EW. (SCAN) S71

tay rew.___[Tumon antral or

ey fowen) Ky font)

KfoN-u) we!

optay__

Mur onec.

ow


2. After AMR rises, if the set is in scan REW., the computer checks scan signal and performs queing processing.

5. STOP > RECORD & PLAYBACK 6. STOP > RECORD-PAUSE

(Rec. 8

wes, beause

Ko. nf ry Ko [ie 2 en naa

Kr ut KL {

RMF a RMF ; 4

na ! run opLay__| OPLAY ‘ i

AMF i AME rn “1 “he 20msec. ee ris 20msec. 8 awn tt ii awa“ ni

ra : aa wrt} + wt —+4

MuT * 1 MuT +t - ity a it

bu __I bu Don’t care: No change

Cautions: 1. After RMF rises, the computer performs puls signal check, auto stop and auto rewind processing.

2. At timer play mode or immediately after attaching the cassette half, it performs correcting the slack of a tape.

7. F.FWD > STOP

Cautions: 1. At recording pause, when play or pause key are depressed, the set switches over to recording mode.

2. Immediately after attaching a cassette half, when pause key performs correcting the slack of a tape.

8. REW. > STOP

STOP KEY [== STOP KEY Cpl LeEWO 1 ‘LREW. 1

1eLay ———] beLcay

Ko iM Ko i

jee ee ee ig yt Le K ae % I

RMF ! ane cee

RMR AMR | !

OPLAY OPLAY :

£8 eB [Romsee——————) ame ame le ame aun Tr oo mut wor mut

aur aur one, once, Bu ——— bow care: No change ou Don't care: No change

14

TIMING CHART

1, STOP > F.FWD

A = 130 msec. B= 30 msec.

F.FWO beLay Leewo___f

Ko toneu___ Ot

a

AMR = 4

aMuT

‘onec. bu


2. It performs auto stop and auto playback processing.

3. STOP > SCAN F.FWD

F.FWDISCAN) bpLay LeFWo Turn on and off at TH?

Ky (ONL) —— i

2. STOP > REW.

Ko (ONL) Ky (ONL)

Ky ONeL) RM RMR

oPLay

AME aur f——. PMT

aMUT

o-nec. bw

Cautions: 1. After AMR rises, the computer performs puls check and auto stop processing at

REW. 2. It performs auto stop and auto playback

Processing.

4, STOP > SCAN REW.

REW. (SCAN) rpLay LEW, Torn on andl oft at We

wetONety

i}

Kitonty Kytonuy ao) tony

ee owe! a Ce

onay onay | ‘a a ae:

ame [ ame [1 ame Tre a 9 PMUT PMUT

wut ii emut cad. onee onec buf ou

Cautions: 1. After AMR rises, the computer performs puls check and auto stop processing at F.FWD,

2. After AMR rises, if the set is in scan F.FWD, the computer checks scan signal and performs queing processing.

13


2. After AMR rises, if the set is in scan REW., the computer checks scan signal and performs queing processing.

14

5. $1

(REC &) PLAY Kt Lae 1s

Cautic

7. Fil

STOP Ke Lev

bps

5. STOP > RECORD & PLAYBACK

(nec &) PLAY KEY L TREC, TPLAY

6. STOP > RECORD-PAUSE

(nec. 8) PAUSE PAUSE LaEC, wm on and off at THe,

Ky CS, ye

RMF z 1

Mai H awa 4 deta! i a ! es! \ esi '

ame | amet ann TT ree ae ame“ tomee HP mt 1 mG + ; a a sur : Se er amar —Tt “

out Du Dont care: No change

Cautions: 1. After RMF rises, the computer performs puls signal check, auto stop and auto rewind processing.

2. At timer play mode or immediately after attaching the cassette half, it performs

correcting the slack of a tape.

7. F,.FWD > STOP

‘STOP KEY 71 LFWD 1 rpLay

Ky

Cautions: 1. At recording pause, when play or pause key are depressed, the set switches over to recording mode.

2. Immediately after attaching a cassette half, when pause key performs correcting the slack of a tape.

8. REW. > STOP

STOP KEY ca LREW. 1 teLtay ——]

Ko M

Rh & — on ——

au ——]_ 3 awe ns: RMR M H ame i

oPLay i H o-PLay : ‘

ee [Ronee 3. ce {ore ————7). ante Foi ame ira ie ame i amr ap

amt PwOT mur mur

aur awur one. onec. BU —— bow’ ear: No change au Don't care: No change

14

9. SCAN F.FWD > STOP 10. SCAN REW. > STOP

stop Key [=< stor KEY [=a Turn off yo staal LF FwO brew, “4 “umn oF ana SHR TRE ur oman oa TRE vetay ——Y tevay eT

Kee por Eon as Se eA « : x, vont a fe

rue ——_? AME ime: oa i FMR = AMR i aot \omsee

orLay ! i oPLay a

eB p =) ee — 1 z 1 ae AME Pee ne AME Fi AMR: I AMR

aUT amt mur mur

RMur Amur one. once,

Diy ———— bons care: No change bu on" care: No change

11. RECORD > STOP 12, RECORD-PAUSE > STOP

stor [JL rec. |

rpause ——|

bw Don't care: No change.

Rut ——t onc. 71

Brnsees Bu ‘Don’t care: No change

15

13. RECORD-PAUSE > RECORD 14, RECORD > RECORD-PAUSE

ray [1 Pause Key___[——] ¢ reLay vetav —4 = thee’ 1. nee. _[Tomenandovar tne race. rate SA ano

ip ee ae a oe

Rue 1} wn

OPLAY T I

: i — oe ane __ Bi (ae ee ee

H T maa wor __| : a a wut once, —t ote, — © aut au—1

Caution: After RMF rises, the computer performs puls check, auto stop and auto rewind processing.

© All sorts of operating mode and conditions of output signals (steady states)

oy [recay [1 ¢ [tpause | AMF | Mut DU C L L_ L H t H L | H L H L H L H u L H t e H 4 & L L t L H = L H t L L H = L L H L H L H

L H L L L L -

H HL L L H L L H H L H (

H L L L L H L H H L L :

H/L L H L H L H L H H H H; high level output transistor on L; low level output transistor off H/L; on/off at 1Hz 50% duty ‘© When it turns on and off from L, it starts from H. ‘© When it turns on and off from H, it starts from L. —: Holds the before state.

16

GENERAL UNIT EXPLODED VIEW

i

CASSETTE MECHANISM EXPLODED VIEW

GENERAL UNIT PARTS LIST

Ref. No. Part No. Description SMe

. 101 A414-CD491A Cabinet Top Assembly

102 A424-CD491A Cabinet Bottom Assembly (U.S.A. & Canada models) ie A424-CD491B Cabinet Bottom Assembly (General model) _

me A424-CD491C Cabinet Bottom Assembly (General model Black Face version) ( 103 A443-CD491A Front Panel Assembly (U.S.A., Canada & General models)

ie A443-CD491C Front Panel Assembly (General model Black Face version) 104 A514-CD491A Plate Assembly

105 A630-CD491A Knob Assembly, Master Fader (U.S.A., Canada & General models) A630-CD491B Knob Assembly, Master Fader (General model Black Face version)

106 AG62-CD491A Push Button Assembly, Power 107 A662-CD491B Push Button Assembly, Rec. Mute, Auto Space 108 A662-CD491C Push Button Assembly, Reset, Time, Count, Memory,

Auto rewind/replay, Dolby NR, NR Type, MPX Filter, Bias/Equalization (METAL, CrO2, LN), Bias Tone, Rec. Cal, Timer (Play, Off, Rec.), Peak Hold,

20

Meter Weighting 109 A662-CD491D Push Button Assembly, Tape Monitor 110 A731-CD491A Indicator Holder Assembly 111 A443-CD491B Indicator Panel Assembly 112 B211-CD491A Chassis Assembly, Front

113 €112-CD491A Cassette Tape Recorder Mechanical Assembly (U.S.A., Canada & om General models) Co

™ C112-CD491B Cassette Tape Recorder Mechanical Assembly (General model Black Face version)

131 1319-0139 Foot

136 1424-09301 Cabinet Back (U.S.A. & Canada models) a 1424-09302 Cabinet Back (General model & General model Black Face version)

141 1513-04801 Plate 142 1513-05101 Dressing Plate (U.S.A.,Canada & General models)

" 1513-05102 Dressing Plate (General model Black Face version) ae 146 1531-05601 Cassette Compartment Cover

152 1630-01901 Knob, Output Level, Mic. Level, Rec. Level (U.S.A., Canada & ‘< General models)

ue A634-CD491A Knob Assembly, Output Level, Mic. Level, Rec. Level (Geneal

model Black Face version) 153 1634-02701 Knob, Bias Fine Trim (U.S.A., Canada & General models)

1634-02702 Knob, Bias Fine Trim (General mode] Black Face version) 155 1662-05501VN Push Button, Eject 161 3351-015 Push Button Assembly, Cassette Mechanism Control 169 2111-1356 Felt 172 2114-415027 Bushing

173 2114-72167 Bushing i 175 2132-7115 Spacer ‘ 180 2114-71254 Bushing 181 2219-7093 Bracket 182 2219-7809 Bracket 191 2224-7061 Insulator (Except General model & General model Black Face version) 192 2240-7118 Holder (Except General model & General model Black Face version) 198 2240-7120 Holder 215 2651-2101705 Spring 220 2674-7013 Slider | 235 2114-01224 Bushing

236 2310-7025 Special Screw 270 2440-61 Special Nut 273 2459-3003511 Rivet 301 2222-7147 Heat Sink : 302 2222-7151 Heat Sink ! 303 2222-7067 Heat Sink 305 2114-71278 Bushing 306 2652-00309 Leaf Spring ( | 307 2440-7017 Special Nut (Except U.S.A. & Canada models) 7 f 401 2211-7238 Chassis, Left (U.S.A. & Canada models) i

a. 2211-7245 Chassis, Left (General model & General model Black Face version) é : 402 2219-7811 Bracket, SW1 #2“ 403 2219-7909 Bracket, Microphone Jack 404 2219-7910 Bracket, Cassette Mechanism Bottom { 405 2219-7911 Bracket, Right

;

Ref. No. Part No. Description

406 2219-7924 Bracket, PCB-1 Mounting 407 2219-7937 Bracket, T1

ad 2219-7963 Bracket, T1 (for General model) ( 408 2347-400647 Bind Head Tapping Screw

409 2347-300647 Bind Head Tapping Screw 410 2343-300627 Self-Tapping Screw 4 2347-300627 Bind Head Tapping Screw 412 2347-300827 Bind Head Tapping Screw 413 2347-260547 Bind Head Tapping Screw 414 2347-300841 Bind Head Tapping Screw

1111-J30147 Owner Guide (U.S.A. model) 1111-J30148 Owner Guide (Canada, General models & General model

Black Face version) 1221-897130 Packing Box

1222-7184 Packing Cushion (2 Used)

4474-29 AC Adaptor (General model & General model Black Face version)

1192-1 Screw Driver, Rec. Cal. Tone Level ADJ.

CASSETTE MECHANISM PARTS LIST


501 S1E08008-07 Rotation Sensor P.C. board 502 SIE02016-09 Head Base Assembly 503 $1D05001-08 Idler Motor Assembly 504 SIE25017-01 Cassette Hold Spring 505 S1E09048-03 PAD Assembly

‘a 506 30A2NLB-51 Direct Drive Motor 507 $1E24010-03 Spindle Spring, Take-up Reel 508 S1E04006-02 Supply Reel Spindle Assembly 509 $1E04018-03 Take-up Reel Spindle Assembly 510 SIE14004-01 Pulley 511, SIE18001-07 Belt 512 S1E24034.01 Spring 513 S1E99017-02 Take-up Pinch Roller Assembly 514 S1E24017-01 Spring 515 SIE24068-02 Spring 516 $1E99018-02 Supply Pinch Roller Assembly 517 SIE12004-01 Adjustment Bracket, Supply Pinch Roller 518 S1E24007-0T Spring 519 $1E09025-01 Lamp Holder Assembly 520 $1E09129-01 Switch & Connector Assembly 521 SIE67065-01 Connector with Lead Wires, 6 Pos. 522 S1E33014-01 Holder, Lead Wires 523 $1001007-14 Chassis Assembly 524 SIE36002-01 Steel Ball 525 SIE36001-02 E-Stop Ring 526 S1E25010-01 Bracket, Head Base Hold 527 SIE21018-02 Lock Lever 528 SIE23004-01 Collar 529 SIE21015-02 Bracket, Cassette Detect Switch 530 SIE20006-01 Lever, Mis-Erase Protect Switch 531 $S1E36001-01 E-Stop Ring 532 SIE36002-03 Steel Ball 533 22145, E-Stop Ring

/ 534 SIE36014-01 Hexagon Nut 535 SEE30545-01 Pan Head Screw 536 SEE30535-01 Pan Head Screw

. 537 SEE10228-02 Washer ; 538 A614-CD491A Cassette Compartment Slot Assembly (U.S.A., Canada &

General model) a A614-CD491B Cassette Compartment Slot Assembly (General model Black |

‘ Face version) |

a

22

ELECTRICAL PARTS LIST

Part No.

VR251 D406 sw2 FA LUG1

LUG2, 3

R101, 102, 531, 532, 591, 592

R113, 114, 117, 118 R115, 116 R137, 138 R273, 274 R365, 366, 367, 368, 465, 466, 671, 672

R505, 506, 565, 566

R507, 508, 567, 568 R557, 610 R651, 652 R667, 668 R761

VR101, 102, 254, 255, 256, 257

VR252, 253 VR451, 452, 751 VR453

c8i C101, 102 C103, 104 C105, 106 C107, 108, 109, 110 C111, 112 C115, 116, 219, 220 C151, 152, 155, 156 C153, 154, 251, 457, 458, 667, 668, 757, 758, 759

C207, 208 C209, 210 €211, 212 C215, 216 C252 C351, 352, 353, 354, 551, 552, 611,612

C455, 456 C501, 502, 527, 528, 561,

562, 587, 588, 615, 616 C503, 504, 563, 564

C505, 506, 553, 565, 566, 613, 614

C507, 508, 509, 510, 567, 568, 569, 570

C511, 512, 539, 540, 571, 572, 599, 600

C517, 518, 543, 544, 577, 578, 603, 604

“RESISTORS

4161-0487 4161-7256

5584-703434 5584-702434 5113-2028221

5623-LT1107 4411-104736 5732-402031 4211-4

4211-6

4472-0125

5174-563381

5174-622381 5174-123381 5102-4704715 5102-6804715

5102-1004715

5174-512381

5174-153381 5102-1204715 5174-104381 5102-5604713

5102-1014715

CONTROLS 5101-20371920

5101-50271920

5101-50371920 5101-50171920

CAPACITORS 5352-224571 5353-270534

5345-226C0226 5345-337A0952 5359-3927851 5345-106C0226 5345-107C041 5345-106C0952 5345-476C041

5345-105F0951 5345-226C0952 5352-154571 5342-106C0951 5342-476C0951 5345-226C041

5345-105F041 5345-106C0951

5345-107C0952 5345-477C041

5359-153771

5345-L106M16

5345-L475M25,

Description

Power Cord Power Cord (for General model) Power Transformer Power Transformer (for General model) Control, 2kQB, Bias Fine Trim L.E.D. Display, Peak Level Meter

Rotary Switch, Voltage Selector (for General model) Fuse, 4A, 125V (Except General model) Lug Terminal Lug Terminal Fuse Holder (Except General model)

56kQ, +1%, 1/4W, Metal

6.2kQ, +1%, 1/4W, Metal 12kQ, +1%, 1/4W, Metal 47, £2%, 1/4W, Fuse 68Q,, +2%, 1/4W, Fuse 102, £2%, 1/4W, Fuse

5.1kQ, £1%, 1/4W, Metal

15kQ, + 1%, 1/4W, Metal 120, +2%, 1/4W, Fuse 100k, 1%, 1/4W, Metal 562, +2%, 1/4W, Fuse 10022, +2%, 1/4W, Fuse

20k2B

5kQB 50kQB 5002B

0.22uF, +5%, 63V, Metalized Polyester 27pF, #5%, 500V, Mica 22uF, +20%, 16V, Electrolytic 330uF, +20%, 6.3V, Electrolytic 3900pF, #2%, 100V, Polypropylene 10uF, +20%, 16V, Electrolytic 100pF, +20%, 16V, Electrolytic 10uF, +20%, 16V, Electrolytic 47uF , #20%, 16V, Electrolytic

1uF, £20%, 50V, Electrolytic 22uF, +20%, 16V, Electrolytic 0.15uF, +5%, 63V, Metalized Polyester 10uF, +20%, 16V, Electrolytic 47uF , £20%, 16V, Electrolytic 22uF , $20%, 16V, Electrolytic

1yF, +20%, 50V, Electrolytic

10uF, 20%, 16V, Electrolytic

100uF, 20%, 16V, Electrolytic 470uF, 20%, 16V, Electrolytic

0.015,F, +2%, 50V, Polypropylene

10uF, +20%, 16V, Electrolytic

4.7uF, #20%, 25V, Electrolytic

Ref. No. Part No. Deseription

C519, 520, 521, 522, 545, 546, 579, 580, 581, 582, 605, 606

C523, 524, 525, 526, 547, 548, 583, 584, 585, 586, 607, 608

C535, 536, 595, 596 C537, 538, 597, 598 C651, 652 C661, 662 C665, 666 C756

1C151 1C201 1C451, 653, 751 1C501, 502, 561, 562 1C651, 652 1C752

083,84, 109, 110, 201, 202, 203, 204, 205, 206, 251, 252, 253, 254, 455, 456, 457, 701, 702

Q101, 102 Q103, 104 Q105, 106 Q107, 108 Q111, 355, 356, 501, 561 Q112, 357, 358 0255

0351, 352 0353, 354 0451, 452, 453, 454 458, 459 651, 652

D101, 102, 501, 561 D251, 254, 455, 456, 457,

651, 652, 653, 654 D252, 253 D451, 452, 453, 454

D562, 563 D751

L101, 102, 203, 204 L201, 202 L205, 206

L501, 502, 561, 562 L651, 652

0s101 swa06 J1/2/3/4 J151, 152 P201 P202, 251, 301, 502, 551, 601

P451 P501, 503 J809

5345-L154M50

5345-L474M50

5359-3327851

0.15uF, +20%, 50V, Electrolytic

0.47pF, +20%, 50V, Electrolytic

3300pF, +2%, 100V, Polypropylene 5359-3927851 3900pF, +2%, 100V, Polypropylene 5359-1515851 150pF, +5%, 100V, Polypropylene 5359-3915851 390pF, +5%, 100V, Polypropylene 5353-101534 100pF, +5%, SOOV, Mica 5345-224F0952 0.22uF, +20%, 50V, Electrolytic

INTEGRATED CIRCUITS 5652-M5218L M5218L. 5652-M5220P M5220P

5652-M5218P M5218P 5652-12038-01 HA12038-01 §652-HA17082P HA17082PS 5652-BA335 BA335

TRANSISTORS

5613-2603(F) 28C2603(F) or 28C2603(E)

5613-2855(E) 2S8C2855(E) or 25C2855(D) 5611-1190(E) 2SA1190(E) or 2SA1190(D) 5613-2320L(F) 2SC2320L(F)

5611-999L(F) 2SA999L(F) 5611-966(Y) 2SA966(Y) 5613-2236(Y) 28C2236(Y) 5611-1115(F) 2SA1115(F) or 2SA1115(E) §613-2320(F) 2S8C2320(F) 5611-999(F) 2SA999(F) 5616-246(GR) F.E.T., 25K246(GR) 5613-2878(B) 28C2878(B) 5613-3246(H) 2SC3246(H)

DIODES

5635-HZ11B2L §631-1S2473

5636-MC921 5635-RD5R1EB2

5635-RD5R6EB2 5635-RD10EB2

COILS 5932-70116

5932-70323 5932-70115

5932-70215 5933-70123

MISCELLANEOUS

6171-0103 4422-70111

4484-24

4452-0110 4443-040185, 4443-030185

4443-100185 4443-034116 4163-071002 2132-5049

Zener, HZ11B2L 182473

mcg21

Zener, RDS.1EB2 Zener, RDS.6EB2 Zener, RD1OEB2

2.7mH

Complex, Record Bias Osc. Remote Switch, Tape Monitor

4-Pin Jack, Line Input, Line Output Jack, Microphones Connector, 4 Pos. Connector, 3 Pos.

Connector, 10 Pos. Connector, 3 Pos. Connector with Lead Wire, 7 Pos. Spacer, D501, 561

23

RESISTORS , R20, 27 5102-4R74713 4.7, £2%, 1/4W, Fuse Zz

CAPACITORS €

c3 5345-478D0962 A700LF, +20%, 25V, Electrolytic c4 5345-228D041 2200uF, +20%, 25V, Electrolytic C5, 6, 11, 13, 51 5345-477C041 470uF, +20%, 16V, Electrolytic c7 5341-109D0958 10000uF, +20%, 25V, Electrolytic C8, 9 5352-684571 0.68uF, +5%, 63V, Metalized Polyester C14 5345-107C041 100uF, +20%, 16V, Electrolytic C52 5345-476D041 47uF, +20%, 25V, Electrolytic

C53 5345-475D041 4.7uF, 20%, 25V, Electrolytic

C54 5345-106D041 10puF , +20%, 25V, Electrolytic C802 5342-475D0951 A.7pF, 420%, 25V, Electrolytic c901 5345-474F041 0.47uF, +20%, 50V, Electrolytic

INTEGRATED CIRCUITS 1c1 5653-T78012AP TA78012AP 1C801 5653-BA6109 BA6109

(C851 5654-58846-41 M58846-641SP_ ae 1C852 5654-TD62503P TD62503P € P 1¢901 5654-TC4001BP TC4001BP °

TRANSISTORS

Q1,9 §611-1217(Y) 28A1217(Y) Q2,11 5613-2877(Y) 2SC2877(Y) - a3 5616-2SK381(D F.E.T., 2SK381(D) = 4, 10, 807, 851, 852,853, 5611-1115(F) 2SA1115(F) or 2SA1115(E) 854, 855, 856, 903, 905 ¢

Q5, 801, 802, 803, 808, 809 5613-3246(H) 2SC3246(H) Q6, 812, 813 §611-1286(H) 2SA1286(H) C> Q7, 8, 12, 13, 804, 805, 806, 5613-2603(F) 2SC2603(F) or 2SC2603(E) . 810, 811, 857, 901, 904

051, 91,94 5611-1115(E) 52, 92, 93 5613-2603(E) 3902 5611-1305(Y)

DIODES D1,2 5632-1SR35-10 D3 5685-1F

04,5 5635-RD9R1EB2 D6 5635-RD8R2EB1

D8, 9 5641-KB265 D10 5635-RD12EB1

D51,55,56,57,58,59,90,91, 92, 93, 95, 96, 97, 98, 801, 802, 805, 806, 808, 809, 810, 856, 859, 860, 861, 862, 863, 864, 865, 866, 873, 902, 903, 904

D52 5635-RD13EB2

5631-1S2473

053, 54 5631-1S2471 D803 5635-RD8R2EB3

D804 5635-RD6R2EB2 D807 5635-RD4R7EB2

24

2SA1115(E) or 2SA1115(F) 2SC2603(E) or 2SC2603(F) 2SA1305(Y)

1SR35-10 Bridge Silicon, SIRBA Zener, RD9.1EB2 Zener, RD8.2EB1 { Varistor, KB265 or MV-12 Zener, RD12EB1 182473

Zener, RD13EB2 182471 Zener, RD8.2EB3

Zener, RD6.2EB2 Zener, RD4.7EB2

| |


MISCELLANEOUS

X851 5693-CSB457 Crystal, Ose. F2,3 5732-402031 Fuse, 4A, 125V = 5732-40202 Fuse, 4A, 250V (for General model)

P801 4443-067114 Connector, 6 Pos. P802 4443-107114 Connector, 10 Pos. P803 4443-097114 Connector, 9 Pos. P804 4443-030185 Connector, 3 Pos. P805 4443-080185 Connector, 8 Pos.

P806 4443-050185 Connector, 5 Pos. P807 4443-060185 Connector, 6 Pos. P808 4443-104116 Connector, 10 Pos. P809 4443-074116 Connector, 7 Pos.

4472-414 Fuse Holder (x4) 2132-7048 Spacer, R13, 810, 811, 832, 835, D1, 2,6 2132-7049 Spacer, R20, 27, 836, 837 2132-5049 Spacer, R833, 834

R191, 192 R428

VR151/152 VR161, 162 VR301/302 VR401, 402

C161, 162 C163, 164 C165, 166 C167, 168 C169, 170 C171, 172 C177, 178, 413, 414 C403, 404 C405, 406 411, 412 C415

1C401

Q81, 82 Q161, 162, 165, 166 Q163, 164

Q167, 168, 169, 170, 401, 402, 403, 404, 405, 406 407

D161, 162 D401, 402, 403, 404 D405 D701

LC161, 162

$W301/302 P401 J402 J501 J503

5102-1814715 5173-270571

CONTROLS 5113-20371140 5113-2038321

5113-5027F40 5101-20371920

CAPACITORS 5345-106C0952 5359-2215851 5345-106C0951

5359-1015851 5345-226C0951

5359-1025851 5345-476C041

§345-475D041 5345-335F041 5345-226C041

5345-227C041

INTEGRATED CIRCUIT §652-M5218P

TRANSISTORS 56 13-2878(B) 5613-2320L(F) 5611-999L(F) 5613-2603(F)

5613-2236(Y)

DIODES 5635-RD10EB2 5631-1K34A §635-RD7R5EB2 5631-1S2473

MISCELLANEOUS

5214-51 4431-02047364

4443-070185 4163-072002 4163-70296 4163-70396 2132-5049

a 1802, +2%, 1/4W, Fuse 270, +5%, 2W, Metal

20kQA, Mic Level 20kQA, Rec Level Left/Right 5kQA, Output Level 20k2B

10uF, +20%, 16V, Electrolytic 220pF, #5%, 100V, Polypropylene 10uF, +20%, 16V, Electrolytic 100pF,, #5%, 100V, Polypropylene 22uF,, +20%, 16V, Electrolytic 1000pF, +5%, 100V, Polypropylene 47uF , £20%, 16V, Electrolytic 4.7uF, 420%, 25V, Electrolytic 3.3uF, $20%, 5OV, Electrolytic 22uF,, +20%, 16V, Electrolytic 220yF, +20%, 16V, Electrolytic

M5218P

2SC2878(B) 2S8C2320L(F) 2SA999L(F) 2SC2603(F)

28C2236(Y)

Zener, RD10EB2 1K34A Zener, RD7.5EB2 182473

LC Components

Push Switch, Rec Mute, Auto Space

Connector, 7 Pos. Connector with Lead Wire, 7 Pos. Connector with Lead Wire, 3 Pos, Connector with Lead Wire, 3 Pos. Spacer, R425

25

Ref. No. Part No. Description 7 Si

D201, 202, 203, 204, 205, §631-182473 182473 206, 411, 867, 868, 869, 3 ¢ 870, 872

D409 §637-GL5HD22 . L.E.D., GL5HD22, Red, Tape Monitor

MISCELLANEOUS

$W201, 202, 203, 401,402, 4431-0918716 . Push Switch, Bias/Equalization, Dolby NR/Type, MPX 403, 801, 802, 803 Filter, Timer

$W204, 205, 901,902,903 4431-A027136 Push Switch, Peak Hold, Meter Weighting, Memory, Auto Rewind/Replay

$W404, 405, 904,905,906 4431-A027236 Push Switch, Bias Tone, Rec. Cal, Reset, Time, Count J803 4163-094502 Connector with Lead Wire, 9 Pos.

2132-01401 Spacer, D409

D851 5637-SY406TK D852 5637-TLR122 .E.! on D853, 854, 855 5637-TLG121 L.E.D., TLG121, Green, F.FWD, Play, Rew. Ree D857, 858 5631-1$2473 182473

MISCELLANEOUS $W101, 102, 103, 104, 105, 4431-A017140 Push Switch, Rew, Play, F.FWD, Stop, Record, Pause 106

'VR163/164

:, Hea phones

Capacitor, 0.01uF, +100% —0%, AC125V, Ceramic 5361-1030419 5352-1030958 Capacitor, 0.01uF, 20%, AC250V, Metalized Polyester

(for General model) swt 4431-A01056 Push Switch, Power f

VR201, 202

| oo

D407 5637-GL9PG19 D408 5637-GLOHY9 L.E.D., GLOHY9, Vallone Dolby C

“LP802 Camiguin

: ae PCB: E .C. BOAL : 906 5613-2603(E) Transistor, 28C2603(E) or 28C2603(F) D905 5637-LT9002D L.E.D., LT9002D, Red, Wait f

DSP901 5623-SLK2452 LED Display

J808 # 4163-101802 Connector with Lead Wire, 10 Pos.

her aap olf 220A o Dileee Dirve bet* S€€ 21 54Fe/ 1 =~

26

The Harman Kardon

Model CD491 Manual 66B_


:

echnical Manual

SUPPLEMENTARY MANUAL 1

MODIFICATIONS WERE MADE AT SERIAL NUMBER 03301 TO IMPROVE PERFORMANCE. EXCEPT

FOR THE CHANGES AS NOTED IN THIS SUPPLEMENT, REFER TO MANUAL 66A FOR ALL OTHER

PARTS AND SERVICE INFORMATION.

harman/ kardon 240 Crossways Park West, Woodbury. NY.1179% 1112-H15266B1 P-088503 1650 Printed in Japan ~~

GENERAL UNIT EXPLODED VIEW

GENERAL UNIT PARTS LIST

MARKETS UF US.A. model GM — : General model Military version A jamodel BB _~—_: Australia model G —: General model © GB_: General model Black Face version

GBM : General mode! Military Black Face version


102 1424-09201 Cabinet Bottom (GM, GMB, B) 103 A443-CD491A Front Panel Assembly (U, A, G, GM, B) 103 A443-CD491C Front Panel Assembly (GB, GMB) 105 AG30-CD491A Knob Assembly, Master Fader (U, A, G, GM, B) 105 A630-CD491B Knob Assembly, Master Fader (GB, GMB) 113 C112-CD491A Cassette Tape Recorder Mechanical Assembly (U, A, G, GM, B) 113 C112-CD491B Cassette Tape Recorder Mechanical Assembly (GB, GM) 114 AS13-CD491A Plate Assembly, L.E. D. 136 A424-CD491K Cabinet Back Assembly (U, A) 136 A424-CD491L. Cabinet Back Assembly (G, GB, GM, GMB, B) 136 A424-CD491P Cabinet Back Assembly (B)


140 7511-02601 Plate, Cassette Compartment Cover (U, A, G, GM, B) 140 1511-02602 Plate, Cassette Compartment Cover (GB, GMB) 142 1513-05101 Dressing Plate (U, A, G, GM, B) 142 1513-05103 Dressing Plate (GB, GMB) 152 1630-01901 Knob, Output Level, Mic. Level, Rec. Level (U, A, G, GM, B) 152 A634-CD491A Knob Assembly, Output Level, Mic. Level, Rec. Level (G8, GMB) 153 1634-02701 Knob, Bias Fine Trim (U, A, G, GM, B) 153 1634-02702 Knob, Bias Fine Trim (GB, GMB) 161 3351-015 Push Button Assembly, Cassette Mechanism Control (U, A,

G, GM, B) 161 3351-016 Push Button Assembly, Cassette Mechanism Control (GB,

GMB) 181 2219-7093 Bracket (for U, A) 191 2224-7061 Insulator (for U, A) 192 2240-7118 Holder (for U, A) 198 2240-7120 Holder (Except U, A) 236 2310-7025 Special Screw (U, A, G, GM) 236 2310-7026 Special Screw (GB, GMB) 237 2310-7027 Special Screw 307 2440-7017 Special Nut (for G) 401 2211-7248 Chassis, Left (Except U, A) 407 2219-7963 Bracket, T1 (Except U, A) au 2347-300627 Bind Head Tapping Screw (GB) 412 2347-300827 Bind Head Tapping Screw (G, GB, GMB)

1111-30148 Owner Guide (Except U) 4474-29 AC Adaptor (For GM, GMB)

CASSETE MECHANISM PARTS LIST

Ref. No. Part No. Description 538 ‘A614-CD491A Cassette Compartment Slot Assembly (U, A, G, GM, B) 538 ‘A614-CD491C Cassette Compartment Slot Assembly (GB, GMB)


Ref. No. Part No. | Description

ta _ GHASSIS MISCE ve A i API 4161-7256 Power Cord (G, GB, GM, GMB) AP 4161-71185 Power Cord (B) AT 5584-702434 Power Transformer (G, GB, GM, GMB, B) AFI 5732-402031 Fuse, 4A, 125V (for U, A)

4472-0125 Fuse Holder (for U, A)

AR465, 466 R557, 610

C119, 120 C253 C254 C527, 528, 587, 588, 615, 616

C553, 613 C661, 662

0361, 352 0353, 354 0458, 459 0502, 562

RESISTORS 5102-1014715 5102-1004715 CAPACITORS 5353-270534 5342-225F0951 5345-226C041 5345-226C0951

5345-228C0962 5359-5615041

TRANSISTORS 5613-2603(F) 5611-1115(F) 5613-945L(K) 5613-2236(Y)

100, +2%, 1/4W, Fuse 1002, +2%, 1/4W, Fuse

27pF, 5%, 500V, Mica 2.2uF, 20%, SOV, Electrolytic 22uF, +20%, 16V, Electrolytic 22uF, t20%, 16V, Electrolytic

2200uF, +20%, 16V, Electrolytic 560pF, +5%, 100V, Polypropylene

2S8C2603(F) 2SA1115(F) or 2SA1115(E) 2SC945L(K) or 2SC945L(P) 2SC2236(Y)


DIODES D103, 104, 502, 5641-KB265 Varistor, KB265 564

D255 5631-1S2473 182473 D562, 563 5635-RD5RGJB2 Zener, RDS.6JB2 D751 5635-RD11JB2 Zener, RD11JB2

COILS L201, 202 5932-70223 3.3mH L751 5597-35502 Ferrite Bead

MISCELLANEOUS J1/2/3/4 4484-24 4-Pin Jack, Input, Output (U.S.A., Canada & General

models) J1/2/3/4 4484-41 4-Pin Jack, Input, Output (General model Black Face &

General model Military Black Face versions) P301, 502, 551, 601 4443-037114 Connector, 3 Pos.

C4 C52 C53 C863

D4,5 D6 D10 D11 D803 D804 D807

L851

VR151/152 VR301/302

081, 82

D161, 162 D405

J502 J551

VR163/164 J601

J301

ACI

D407 D408

_ PCB:

CAPACITORS 5345-478D0962 5345-475D041 5345-476D041 5345-226C0951

DIODES 5635-RDOR 1JB2 5635-RD8R2JB1 5635-RD12JB1 5631-1S2473 5635-RD8R2JB3 5635-RD6R2JB2 5635-RD4R7JB2

MISCELLANEOUS 5597-35502

CONTROLS 5113-50272140

5113-50271150 TRANSISTORS 5613-945L (K)

DIODES 5635-RD10JB2 5635-RD7R5JB2

MISCELLANEOUS 4163-70696 4163-70796

PCE.6 MAS) 5113-10397122 4163-70496

HEADPHO! 4163-70596

PCBS POWER § 5352-1030958

5637-GLOHY9 5637-GLOPG19

ITCH P.c. BOARD

4700uF, + 20%, 25V, Electrolytic 4.7pF, +20%, 25V, Electrolytic 47uF, £20%, 25V, Electrolytic 22uF, +20%, 16V, Electrolytic

Zener, RD9.1JB2 Zener, RD8.2JB1 Zener, RD12JB1 182473 Zener, RD8.2JB3 Zener, RD6.2JB2 Zener, RD4.7JB2

Ferrite Bead

5SkQA, Mic. Level 5kQA, Output Level

2SC945L(K) or 2SC945L(P)

Zener, RD10JB2 Zener, RD7.5JB2

Connector with Lead Wire, 3 Pos. Connector with Lead Wire, 3 Pos.

BOARD

Control, 10kQA, Master Fader Connector with Lead Wire, 3 Pos.

SUA OAR ! Connector with Lead Wire, 3 Pos.

Capacitor, O.01uE, 420%, AC250V, Metalized Polyester (Except U.S.A. & Canada models}

ICATORS PCB

LE.D., GLeHYe, Yellow, Dolby NR Cc L.E.D., GL9PG19, Green, Dolby NR B

A SAFETY RELATED COMPONENT. USE ONLY EXACT REPLACEMENT PART AS SPECIFIED.

A B c D E F G H i) J K L M N ° P

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MICRO COMPUTER CONTROLLED PROCESSER BLOCK De Ne eR Re ee Ae ee Be A ee eee he Ne ee eee eee ae eee

RECORDING SIGNAL (Lch)

PLAYBACK SIGNAL (Reh)

HX-PRO SIGNAL

1. ALL RESISTANCES VALUES ARE IN Q. kQ= 10002,. MQ= 1000k2

THE WATTAGE OF RESISTORS IS 1/4W UNLESS OTHERWISE NOTED. ALL CAPACITANCES VALUES ARE IN uF UNLESS OTHERWISE NOTED. P = uyF AND ALL ELECTRICAL CAPACITANCES VOLTAGE VALUES ARE GIVEN WITHOUT UNIT. THE OMITTED UNIT IS V. 47/50 >47yF/50V

4, V: DC VOLTAGE AT NO SIGNAL. ...V STOP MODE

V|PLAYBACK MODE V) RECORDING MODE

5. A SAFETY-REQUIREMENTS COMPONENTS IN ACCORDANCE WITH PRESENT SAFETY. REGULATIONS. THESE COMPONENTS MUST ONLY BE REPLACED BY ORIGINAL PARTS. 5:

SS

7 | SCHEMATIC DIAGRAM

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V) RECORDING MODE A\ SAFETY-REQUIREMENTS COMPONENTS IN ACCORDANCE WITH PRESENT SAFETY. REGULATIONS, THESE COMPONENTS MUST ONLY BE REPLACED BY ORIGINAL PARTS. 5

A B c D £ F G H I J K L M N ° P

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1

—

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y t To PCB-2=———o RECORD / PLAYBACK EQUALIZER FREQUENCY CHARACTERISTIC ADJ. PUT INPUT MICROPHONES

PCB-I JULEFT LEFT JIS! 2 J2 RIGHT RIGHT JI52

VR251 BIAS FINE TRIM

> VOLTAGE ver SELECTOR

Pl AC 100/120 /220/240V PI 50/60Hz Ke ioe.

3 60Hz

ZS USO.

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4 TP203 fk

5 PEAKING com, ADJ. .

RECORD /1 PLAYBACK EQUALIZER FREQUE! CHARACTERISTIC ADJ.

D.D.MOTOR , CAPSTAN

6

esp D: iy Ren ivan ren tateees = = = more A ST a aT

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MIS-ERASE PROTECT

£ ROTATION SENSOR P.C. BOARD SWITCH ERASE HEAD DOLBY B-C NR BIAS/ EQUALIZATION —TIMER— impx meter

METAL CrO2_ LN play off rec weighting —TAPE COUNTER— 0: 5 reset time count

Sw904 Sws05 S

CASSETTE PACK 4

DETECT 8 SWITCH gy

war, DC MOTOR, REEL ear ee ee :

SW90I Sw902 SW903 4 sw404 sw405 memory —AUTO— tape moniter bias tone reccal

rewind replay i Lrepeat i

PCB-5 : : : | Pattern Side : — PCB-3 METER LEVEL Ry |

| PCB-II

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} | TLLUMINATION

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REW PLAY F.FWO STOP RECORD PAUSE Mou LEFT MIC LEVEL OUTPUT . AUTO REC rec cal MASTER J351 10) AUTO SEARCH AUTO SEARCH —REC LEVEL — LEVEL SPACE MUTE FADER HEADPHONES

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| WIRE COLOR ABBREVIATIONS : Red

PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICs.

WwW ‘2SA999 28C2236 RD8.2EB83 26! LT9002D TA78012AP_ | HA17082PS_—_| BAS35 TC4001BP TD62503P 28C2603 2SA966 fl f

2SA1286 28C3246 . : Purple E e : Pink

Zp 18R35-10 8 4 6 ce RD8.2EB1 1 4

RD12EB1 2SA999L 182473 RD13EB2 GL5HD22 GL9PG10 TLR122 M5220? M58846-641SP 2SA1115 RDS.1EB2 ee MR | GLOHYS 4g | TLG121 M5218? 2SA1190 RD9.1EB2 cothode Cathode 28C2320 HZ11B2L Zanose | cotove ee 2SC2320L RDS.6EB2 ‘anode te’ 2802855 e¢ RDIOEB2 ey wa 8 28C2878 182471 er DI0E Anode we

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The Harman Kardon

Model CD491 Manual 66C


echnical Manual

SUPPLEMENTARY MANUAL 2

MODIFICATIONS WERE MADE AT SERIAL NUMBER 10601 TO IMPROVE PERFORMANCE. EXCEPT

FOR THE CHANGES AS NOTED IN THIS SUPPLEMENT, REFER TO MANUALS 66A AND 668 FOR ALL

OTHER PARTS AND SERVICE INFORMATION.

harman/kardon 240 Crossways Park West, Woodbury, N.Y. 11797 1172-H18266C1 P-078503 1650 Printed in Japan

cD491



R509, 510, 569, 570 R529, 530, 589, 590

cat C103, 104 C111, 112 C505, 506, 565, 566 C509, 510, 569, 570 C511, 512, 539, 540, 571, 572, 599, 600

C519, 520, 579, 580 C525, 526, 585, 586

1C501, 502, 561, 562

Q107, 108, 113, 114 0458, 459, 701, 702

AR1,2 AR13, 20

C5, 6, 8,9, 11, 51 c14 c18 C863

Q3, 10, 907 053,54 ag2

D1,2 D4,5 Deo D63 p99

L851

P803

C417

D405

D905 D906

PCB-1 MAIN P.C. BOARD. ih

RESISTORS 5174-332381 3.3kQ, £1%, 1/4W, Metal 5174-473381 47kQ., £1%, 1/4W, Metal

CAPACITORS §342-475D0951, 0.47uF, +20%, 25V, Electrolytic 5345-226C0951 22uF , #20%, 16V, Electrolytic 5345-106C0951 10uF , £20%, 16V, Electrolytic 5345-227C041 220uF, +20%, 16V, Electrolytic 5359-333741 0.033uF , +2%, 100V, Polypropylene 5345-L475M50 4.7uF , $20%, 50V, Electrolytic

5345-L334M50 0.33uF, £20%, SOV, Electrolytic 5345-L684M50 0.68uF, +20%, SOV, Electrolytic

INTEGRATED CIRCUITS 5652-12058-01 HA12058-01

TRANSISTORS 8611-1115(F) 2SA1115(F) or 2SA1115(E) 6613-2878(B) 2SC2878(B)

| PCB-2 LOGIC CONTROL P.C.BOARD

RESISTORS 5102-1R05114 102, £5%, 1/2W, Fuse 6102-1005114 100, +5%, 1/2W, Fuse

CAPACITORS 5345-477C041 470uF , $20%, 16V, Electrolytic 5345-227C041 220uF, 20%, 16V, Electrolytic 5345-107C041 100uF, #20%, 16V, Electrolytic 5369-1027851 1000pF, +2%, 100V, Polypropylene

TRANSISTORS 5613-2603(F) 28C2603(F) or 2SC2603(E) 5613-2603(E) 28C2603(E) or 25C2603(F) 5611-1115(E) 2S8A1115(E) or 28A1115(F)

DIODES 5632-ERCO402F ERCO402F 5635-HZ12C2L Zener, HZ12C2L 5635-RD6R8EB2 Zener, RD6.8EB2 5632-DS135E DS135E 5631-182473 182473

COIL §995-3R9233

MISCELLANEOUS

4443090185 Connector, 9 Pos.

PCB-3 VR P.C. BOARD

CAPACITOR

5345-107C041 100uF, +20%, 16V, Electrolytic

DIODE 5635-HZ9B2L Zener, HZ9B2L

PCB-12 TAPE COUNTER P.C. BOARD

5637-GL5HD5S L.E.D., GL5HDS5, Red, Wait

5631-1S2473 Diode, 182473

2 4 SAFETY RELATED COMPONENT. USE ONLY EXACT REPLACEMENT PART AS SPECIFIED.

A B =} Cc D = E F

SCHEMATIC DIAGRAM ;

P ° I 5 = Ic4oi l tls 8 M5218P ©! t Senoserr) Se os ' 2sage = 5 : 0355 Te on wn meee Spore ash’ 823 4 Law 2sasseryiess SORT 15 Bada Balan |& wowiroat ope Honor O8 eax} g<] ee

101 Py = ger R553 ct & e oscaiis ote) 2 : ee ap ial toh (Bor (0) ee ¢

—~ OUTPUT TPIO1 +——_ I [sav L : 38 __ 2800 - 94] | Ss [Laveack | aE 1 i Bk a ee a za | [doe Ren 2103 ca IC501 —-HA12058-01

Kole piiceat : nis 2581190 Abs. = 1 0401 & [sls Si, | cigs SF teres Boun08 are ir ee aed a ces thie Pers Te jseasoun| 7° |ze5 2405 V7 ahs 1

an. # ale sem) sah ! 280908L(K) BE cao a7 d 7 o ere ef? v ore 0.68/50 1 oy st M5218P 2502603 Ton) F " - syns cere mer] | naoe @o z e i T 8 rely 102! bSae * aye S [ecorp PLAYBACK qT s32 $38 noe «i ee Pl L od eae Oe is & = Tetrstatre wat He I TP1O2) ry R86 BEE x\3lis % om ' (25) Ses | 83*| & 0281 Lest I . z ¢ 2 ].2 asafi9 a n ' fewaoscizar = 2 bleSle Sled ese [Bort c1ga'zg0 VEVortD) 1 [ Bae ele’ tape Py ; is eee Eve <E

RIGHT 22/16(AR) HW 3 ay Spe Aronieer, °3 ie HV. Sup--f4 --- ae or (E) Z| ae pe: cee ele [28s & 1 nail 33K S gee 504 Reh, ls age 23 : EA papal | wean [eT ke ath fF BZ Ineo 2SC2605I" JonED els H Ss Ley R27! 2 ge From, |) ER jisears xe a ‘ fr B38 & \ 3 . pees Be a pS rom }] EQ | | 4 H C946 oe 0358» |sw202| 1 eae |

: eae asceasemige Shon k | {p208h AUTO SEARCH ADJ. ~ ete I, 1 ae +Vec (AUTO SEARCH A03.] R759 ~ e238 \\ fi, e284 Sw205 sw204 coal * cata |} o sw408 (2/2) acy }\ 28ezcosiere | 1 mater peak | ns 3 ape \ 21 Of | R762 VRi ae ay esos 2 coee monitor Ses 3 | BIAS LEVEL ADJ. “p81 267s} fox leu welghting hold fe

am Soe elt) 1 Peoss FEED || Fone: Monitor a” | | RecorD PLayBack © ee qebel |. me 1 t : indicator (0409) ] |__| EQUALIZER FREQUENCY | rea ea oh h ox ze] o[ 2h MARACTERISTIC ADJ en) 345 2830] g[27¢ ee 25080) ars i B = 40s, : t =a = Rase2i

> 1 m5220P HE | pean Ns EE Fe EERE, 0 me y35!

i ord “oF T]neaoPHones re

4 q Ta 4

1 wonton # S ces pod at faz oy

St - & 7] whew | a g STEP UP wy. 985! 25c324 4 3 dsc | bat eee 38 a7 a6 25 aa 23220 ie 5 abs 2 7 ov Sev 67V 67V Bev BBV TOV 1.0V eav 7aV 8380201, if 1C561 —HA12058.01 ascesos |ascasos |ascas7ei Hf TRS . : sv gv 6SV BBV Ogv cow sev Fron erie) | 5 E ad ai lil a a Ye 7 F 7 is 7 roa R155 wie i REC INPUT Is RECORD PLAYBACK fi ielst “i au ad IB 3 i= EQUALIZER [P2082 f M5218L ig " Rigg 1. “= y . Tove CLL) Pg ose/s0 122,00" | FREQUENGY | Ltp202 / 5 e cist Zini9g 20] : <ieme ge] 2 202 neoe ASERSBTIC BIAS TRAP ADJ Ices! Ices sist SF 3, oe )28e 2220 a ' “Fol 6, 150° 120K mk Aedh tx’ duairos2rs Halvoszes| | 5218p tems 2 ask _ |i ae | frie : ele = : Tie. esis ) LEFT aL rast giss | OU G sv ff 22K | #7813 22K oy nz36 ol C7 | 1 828 g , ae wale tow 7 35e aha” slahices sie | ¥ 3 castor Bt { ‘h aise rd ej5 zg8 stg are | cite! $ne ate are a) ov nore A i 5 pe oh | |Beaae e , soe m 0 Hee t ! f Yr

a — a 2 @ 3 votrR - oss a16s aepeseey gs ET o <(F ele abe MICROPHONES: ny 2 2SA999L (F) flzsc2201 C uel t enor || ' aed atk 2 o.0a oY Bae t ati 312 *des ry aay a rc S 5 Z sfo202 bins eee 8 1 58%6 EE ore ww = 35 a]? Be d vise | [88 fee te SONSER era els ! ie REcoRO|s| | et ai Sex ye aie7 He 23 gl [tox / 7 RIGHT re Risa sig zee *lescasoairorie)| \Ot69 ie, * aQA58 fa ae08 8g onrToR dos. _|* —[zscaeo3 |ascesos] [2sceo7es) 7 3 ae | 0 i 5 ‘OUTPUT Pp trent [er vorte x ICSI [eal ogev F 22/6ILL) ao - 7 i ri Revi MS218L aa z 33 ‘ Bay. RECORD LEVEL ADJ. | al ey H é [osiew '

als e162 mS os |RECORD PLAYBACK | Satie. $385 * S¥s I : 5[8 ise HA12058.01 EQUALIZER 3 pe zene Si aacaseol I 1562 ; FREDO ;: 3 an nize £33 i a | ad id eld Ed g Aas eal $28 2” ~ ial ical . a ie -E — = re Sa RSE ES ate; * : = fare a : ih $$ fe E S85 ge ses ls g Benet T . + FS STE Land S32 eee 1ces2 1652 1c653

ors aise) 38 ' ° 3 nak HAI70B2PS Hal7062PS|____M5218P ere INPUT is nies 2sag99LiF) | 2sc2320L fei 78 aM ‘ re se ae Dene, S24 7e, ™ ate es wale ea a) Pes Sw302 _SW3O! L8TS ! cl 3 Fa i AUTO SPACE REC MUTE atx I Reh B35 tix = - ars ee ; ; css ® sls : z 38 g are be - :

acs 1oorm) _1C451 MS218P | or Lv 1 = ' H 1 3 Se elena Ue cate ' tee Dstsee Ss

a Scere, : MECHA | a decal 906 ad nest 0451 n4s3 Leh OUT 1 les Gisios 18247 i +e Tao e i Pas hae | —— 0s, ,BTR_098,., 192678 90 fi ! — 78 387 7 H 7 ae 1° cr re coor emanate] | | hunt 2sc2603 1 © [pes szas——— | 0852 TLRIZ2 Be I everte) f gx sdePs ae, fee Dess~as5. Tisi21 volt | |} ||fecseeree BAIZIAY) so sBmeny f ee ele f eys 991 34 98 132473 eer = ts _/L| 048? ecco : 2Saiii5 1s2079_ B58 elo} | Porte gio aa a [pias rae 1 0851 svaoery| F iy 700K 2

REC. CAL] "A TONE: 0453 msec 1 GE) oa PAUSE 4 DSP901 | t x“ ive : 180K bi BScseaciny z cm SLK2452-2 5 1 LEVEL 1C451 MS218P RDS. 1EB2 3: i * TAPE COUNTER 1 O.16v, 1 nase D452 D454 25 MECHA 2 Pe | I ADS. \ i a eae I | ' ; =e \, er ' B ges J eho ooor Ic4st \ Took 3 vs gece 2 28C2603 0454 be ates ‘3 ort nese \ ia & | S56 EI vooKg Te neds Res ale B25 Good sone eon ors. g Pad pias sans Ble] 2sainis 3 2sc2eosiFiorie) z s a is i (Fiorte) 2 1 ™ secs E oa 2 co eh mara L| rook H ase EI Moasraap SES] [SWIOS REC 28C2655F one) “Tunel22v) ae ce aR) Gipe de Kal Sd [182473 or TD62502" BLT 1 8x l —_ ae 38 sToP H 1 4 Siar as a I Pare 1 28 4 1 eg Flee Sig, a SWIO3F.FWO| gk I 2 & | gee 4 | f g tk 38 De10 3 3 03 Bee A \_ nary Gal (:) at ada 182473] sG5603 D80er=) Iswio2 PLAY TeS0l"TC4001BR: es = 28¢26091F ore) sci 2 POWERA,

Wok =e Pasay Flore) ‘> : aw 907 330K Se Sell egy: ao 9457 rr [na a 2 re 28C2603(For(E) aw ate 2 SS i cee 8 € pA i Ls, 2 aa06 el £ 5 Zé Aci20Vv a a = Sscaeos £38 A : 1 acles a meWEE] 0805 Geiorte) B 3 aanes non gibeacatienbe || fans she 2scesoscevone nae 2] H ' $36 sce} % 7 Me 902,903 1 a, °% ey Fila A Swi Meter Dri (Frerre}irv| - a Meter ove (EFerrsT we) fpr 182478, vacate) oFF | I : “ aa aad Dower

[pero] AUTO 5 2 = Bears (° TY [aus é Q Tet ra = ‘o807 egos ‘9809 ex 28¢2603 Lo sw903 OL. hon Dolby B 2SAIIISIFor(E) 25C3246(H) _ 25C32461H) pose Pe (Fore) |Sweot ie 58, 152473 B8CzB77(0) “i amiem General mode! jolby 1 e 2 PLAY = [pa60 iad 0203 1s2475 { I . x, : sweo2torF | isea73 a 2A cos ° & ma | re 2g 4 | et ° ® 2 2330 p51 . 9811 ete g vase AUTO 2saiiis 3 47 eae) aee |E ET e©.. fue | EE [og ro 53 | || tit seat GD ai ghp Ber 3s 2 1 Dolby C a 10 (Forte) 8ls [sears] oy Iswoo2 1 eae: | 4 3 “CEP 4 sw404 SW405 sw4ol FA swo0s I swi eed Il H 882 tbo | nog,a7on 085 152473 A\D5s time

SW803 REC ‘0870. 1oos\207 bias ree Dovey at g te " 's2473 ! . Isza7 BS dPRARY ne ea $ dg ves 8 0760) 22 TAPE ow ii '§ “Teast 0 § | en) BFE s2ers s Absa has

2 a ee re Sootmen evar’ 28cee0s “{'mse846-64isP ae ~ a sears < 2 | +12 Berto t W901, : g Mi — 2 Q52 2SC2603(F lor(E) 8 3 3 ai z 2 td sw203 SW202 sw20t 812,813 z $2823, “00r 1 pL 8% D57\o I 3 r rs uN cro2 METAL 2sAl2e6H) 3 ii oc isos 0806 182473van| 780) ey > > AS / EQUALIZATION ——— 2SC26031F rE), | 3 zo ge be he : ro ' ! . 8 8 = = I 1

on 8 -—— x 0851~856 D859 ~866

2SAlli5(F Dore) 182473

rom Tape Monitor switch

fee .. ... RECORDING SIGNAL (Lch) . ++ PLAYBACK SIGNAL (Reh) . ++ HX-PRO SIGNAL

1, ALL RESISTANCES VALUES ARE INQ.

kQ= 10002, MQ= 1000k2 2, THE WATTAGE OF RESISTORS IS 1/4W UNLESS OTHERWISE NOTED.

3. ALL CAPACITANCES VALUES ARE IN uF UNLESS OTHERWISE NOTED. P = uu F

AND ALL ELECTRICAL CAPACITANCES VOLTAGE VALUES ARE GIVEN WITHOUT UNIT. THE OMITTED UNIT IS V. 47/50 + 474F/50V

4. V:DC VOLTAGE AT NO SIGNAL

...VSTOP MODE

...VJPLAYBACK MODE

(... V) RECORDING MODE

5. aA SAFETY-REQUIREMENTS COMPONENTS IN ACCORDANCE WITH PRESENT SAFETY

REGULATIONS. THESE COMPONENTS MUST ONLY BE REPLACED BY ORIGINAL PARTS.

SCHEMATIC DIAGRAM

PLAYBACK HEAD

om 2saseety)

LAYBACK TRAP

q 06)

cus

2109

Sor i ae

Riss 10k

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RIGHT —= c1gs'220

22/6.AR)

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Rios 2sati83 (rort0)

2802603

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re nae a = “2 : 063 ¥ vosiewu [R5OF Sel 4

23C2603(E10KF) 4K 8

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‘ £201 ‘060 oe Reor ‘ “wl z irs E

1 | 3

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1C561—_Hat205801 gov av epv Cae ee ee if

ourhur EC INPUT eet finds nd - jovietu) [A36t Bie =

am “is fee wie

reio A rf y em poLay NR on/ore

--—_—— - -. moncro ‘oureur seis 624 Re ae parte. mis

1562 HAI205801

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R301 18 “470 3

TEV 9357 sat asces6iige

280945L(K) ore) “ane

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™

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nave

22n6a2 asaitis

— (F)or(E} 2SCOHBLIK) oP)

| 3) 6 swaos (22) tape monitor

{ a Stare [EqI|T® Te0e Honor indicator (0409)

358 2 asce2a6inigo.

D254 neve fe 1s2873 2SAu84

y T RECORD PLAYBACK | RR FREQUENCY | reeo27e

Rat are 925) nese 282603,

Pore)

Es

252 SC26O3IF or (E)

‘| B5e2eosirrere) —_g| 0258 sve [ BiAS LEVEL. ADS. 38, 182473 10K

& 58 | RECORD PLAYBACK “| | EQUALIZER FREQUENCY

HADACTEDICTIC ADL

Ic4o1 MS218P C13

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1201 MS220P

201 R207 Oop TOK “ aoe

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10208 is2a73

Vo204

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meter peak 1 weighting — hold

RECORD PLAYBACK | EQUALIZER

£222,008 | FREQUENCY Te cepiMsezee sa 00P 120% ‘i ‘Reoe

[P2802 }

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et ie =] agcesos[ascasos | [ascze76) 7 eres? [RAG | Foren ieoa7s _/ |

zt i RECORD LEVEL ADJ | al oe & i He RECORD, “PLAYBACK He api. |avatwer EMI | eaeduency

1 i ‘ ‘ Ek

REF Ic651 Loch, HAI7082PS [ ale Noo PSohulag®

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‘@harman/kardon Service Bulletin

SERVICE BULLETIN #4005 - DECEMBER, 1984

TO: ALL HARMAN KARDON WARRANTY STATIONS

MODEL: CD391/CD491 STEREO CASSETTE DECK

SUBJECT: POP SOUND RECORDED ON TAPE

In the event you receive a CD391 or CD491 Cassette Deck with the complaint "unit records pop or bleep on tape when placed in record pause mode" we recommend you solder on the micro processor

PC Board a signal diode between IC 801 and IC 852.

The anode of this diode is connected to PIN 6 of IC 801 and the cathode of this diode is connected to PIN 14 of IC 852.

The purpose of this diode is to prevent the transport from rewinding the tape momentarily at the moment the pause button is

r ) depressed.

Due to this momentary rewind of the tape while the bias oscillator is on, the bias signal will be recorded on the tape at high tape speed. When the tape is played back this high frequency signal

becomes audible.

The modification indicated above will prevent this momentary rewind.

Harman Kardon Incorporated, 240 Crossways Park West, Woodbury, New York 11797 (516) 496-3400 TELEX: 22 99 11 HARMN UR

Manual: CD491 SM HARMANKARDON EN

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