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10

This adjustment should be performed when replacing the head assy
or the bias oscillator transformer (T131, T231),(T141, T241).

Setting:
 REC LEVEL  knob : standard recording position (See page 11.)

1. Connect the digital voltmeter to test point TP331 (DECK A) and

TP441 (DECK B).

2. Set DECK A: RV131 (L-CH), RV231 (R-CH) and DECK B:

RV141 (L-CH), RV241 (R-CH) to mechanical center.

3. Press the  H  button to playback.
4. Adjust DECK A: T131 (L-CH), T231 (R-CH) and DECK B:

T141 (L-CH), T241 (R-CH) so that the digital voltmeter r e a d -
ing becomes minimum.

Adjustment Value: Maximum 220 mV

Adjustment Location: MAIN board (See page 14.)

Setting:
 REC LEVEL  knob : standard record position (See page 11.)

Procedure:
1. Set to test mode (See page 11.)
2. Insert a tape into deck B, press the  REC z  button and then

press the  H  button to start recording.

Adjustment level:
The palyback output of 10 kHz level difference against 315 Hz ref-
erence should be ± 0.5 dB.

Adjustment Location: MAIN board (See page 14.)

Setting:
 REC LEVEL  knob : standard record position (See page 11.)

Procedure:
1. Set to test mode (See page 11.)
2. Insert a tspe into deck B, press the  REC z  button and then

press the  H  button to start recording.

3. Record Mode

4. Playback Mode

Ω

Ω

3. Record Mode

Ω

4. Playback Mode
5. Confirm playback the signal recorded in step 2 become adjust-

ment level as follows.
If the selevels do not adjustment level, adjust DECK A: RV131
(L-CH), RV231 (R-CH) and DECK B:  RV141 (L-CH), RV241
(R-CH) to repeat steps 3 and 4.

Ω

Ω

Ω

5. Confirm playback the signal recorded in step 2 become adjust-

ment level as follows.
If the selevels do not adjustment level, adjust the DECK A: RV102
(L-CH), RV202 (R-CH) and DECK B: RV101 (L-CH), RV201
(R-CH) to repeat steps 3 and 4.

LINE OUT level : –23.8 dBs ± 0.5 dB (47.2 to 53.0 mV)

Adjustment Location: MAIN board (See page 14.)

11

Adjustment Location: main board

12

TRANS (A) board (

v

 E)

MAIN board

RECVOL board (

v

 G)

H.P board (

v

 D)

HEAD RELAY (REC/PB) board
(Deck B)

HEAD RELAY (REC/PB) board
(Deck A)

LEAF SW (REC/PB) board
(Deck B)

PANEL board (

v

 A)

DIRECTION board (

v

 C)

POWER board (

v

 F)

LEAF SW (REC/PB) board
(Deck A)

TRANS (B) board (

v

 B)

•

vA to vG are including into the mounted PANEL board.

13

13

Note:
• All capacitors are in µF unless otherwise noted.  pF: µµF

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

%

: indicates tolerance.

•

f

: internal component.

•

5

: fusible resistor.

•

C

: panel designation.

• X

: parts extracted from the component side.

•

: Pattern from the side which enables seeing.

• Transistor of “B” and “C” indication is omitted.

•

A

: B+ Line.

•

B

: B– Line.

•

H

: adjustment for repair.

• Voltage is dc with respect to ground under no-signal

(detuned) condition.
no mark : STOP
(

) : REC

<

> : PB

∗

: Can not be measured.

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

E

: PB

a

: REC

• Abbreviation

CND : Canadian model.
AUS

: Australian model.

SP

: Singapore model.

1

IC801 

el

 EXTAL

Note:
The components identi-
fied by mark 

0

 or dotted

line with mark 

0

 are criti-

cal for safety.
Replace only with part
number specified.

Note:
Les composants identifiés par
une marque 

0

 sont critiques

pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.

4.4Vp-p

10MHz