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3

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A

14

[CD Ship Mode]
• This mode moves the optical pick-up to the position durable to

vibration. Use this mode when returning the set to the customer
after repair.

Procedure:
1. Press ?/1 button to turn the set ON.
2. Press three buttons x (TAPE A), x (CD), and Z (CD1)

simultaneously.

3. After the “STANDBY” display blinks six times, a message

“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship mode is set.

[GC Test  Mode]
• This mode is used to check the software version, FL tube, LED,

keyboard and VACS.

Procedure:
1. Press three buttons ?/1 , x (TAPE A), and  x  (CD) simul-

taneously.

2. LEDs and fluorescent indicator tube are all turned on.
3. When you want to enter the software version display mode,

press  CD 1 .  The model number and destination are displayed.

4. Each time  CD 1  is pressed, the display changes starting from

MC version, GC version, CD version, CDD version, CDM
version, BD version, ST version, TA version, TM version, TC
version and MD version in this order.

5. Press  CD 2  button, and the key check mode is activated.
6. In the key check mode, the fluorescent indicator tube displays

“K 

0

  J 0  V 0”.  Each time a button is pressed, “K 0” value

increases. However, once a button is pressed, it is no longer
taken into account.
“V  0” value increases like 1, 2, 3 ... if rotating  VOLUME  knob
in “+”  direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.

7. To exit from this mode, press three buttons in the same manner

as step 1, or disconnect the power cord.

[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the optical pick-up.

Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons x (TAPE A), x (CD), and  CD 2  simulta-

neously.

4. The CD service mode is selected.
5. With the CD in stop status, turn the shuttle knob clockwise to

move the optical pick-up to outside track, or turn the shuttle
knob counter-clockwise to inside track.

6. To exit from this mode, perform as follows:

1) Move the optical pick-up to the most inside track.
2) Press three buttons in the same manner as step 2.

Note: • Always move the optical pick-up to most inside track when exit-

ing from this mode.  Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can be

chipped.

[CD Ship (Memory Clear) Mode]
• Set the CD ship mode and set the default setup when shipped

from the factory at the next AC power on.

Procedure:
1. Press  ?/1  button to turn the set ON.
2. Select the function  “CD ”.
3. Press three buttons x (TAPE A), x (CD), and Z (CD1)

simultaneously.

4. After the “STANDBY” display blinks six times, a message

“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship mode is set.

15

2.

Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.

0 dB=0.775 V

Note: Confirm each contents of this section first of all. If the results are

not satisfied, do the adjustment.

1.

Demagnetize the record/playback head with a head
 demagnetizer.

2.

Do not use a magnetized screwdriver for the adjustments.

3.

After the adjustments, apply suitable locking compound to the
parts adjust.

4.

The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

5.

The adjustments should be performed in the order given in this
service manual.  (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)

6.

The adjustments should be performed for both L-CH and R-
CH.

7.

Switches and controls should be set as follows unless otherwise
specified.

• Test Tape

Record/Playback Head Azimuth Adjustment
Procedure:
1.

Mode:  Playback

Tape

Signal

Used for

P-4-A63J

10 kHz, –10 dB

Azimuth Adjustment

WS-48A

3 kHz, 0 dB

Tape Speed Adjustment

P-4-L300

315 Hz, 0 dB

Level Adjustment

set

MAIN board
SPEAKER terminals (SJ301)
L-CH, R-CH

+
–

level meter

test tape
P-4-A63J
(10 kHz, –10 dB)

Screw
position

L-CH
peak

within
1 dB

Output
level

L-CH
peak

R-CH
peak

within
1 dB

Screw
position

R-CH
peak

3.

Mode: Playback

4.

Repeat step 1 to 3 in playback (REV) mode.

5.

After the adjustments, apply suitable locking compound to the
pats adjusted.

set

test tape
P-4-A63J
(10 kHz, –10 dB)

R-CH

oscilloscope

L-CH

R-CH

V

H

waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

MAIN board
SPEAKER terminals (SJ301)
L-CH

Connect jig (extension cable J-2501-011-B)
to the MAIN board (CN304) and CD board (CN101). 

MAIN board

CD board 

16

1.

CD Block is basically constructed to operate without
adjustment.

2.

Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.

Use an oscilloscope with more than 10 M

Ω impedance.

4.

Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.

5.

Check the focus bias check when optical block is replaced.

Procedure :
1.

Connect oscilloscope to TP (RF) and TP (VC) on the CD board.

2.

Press the

I/1

button to turn the power on, and press the

Z

(CD) button to open the CD disc tray.

3.

Put disc (YEDS-18) in and press the

u

(CD) button to play-

back.

4.

Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape ( 

 ) in the

center of the waveform can be clearly distinguished.

+
–

BD board

TP (RF)
TP (VC)

oscilloscope

(DC range)

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level:
1.2 

±

 0.1 Vp-p

s

16

15

2

1

15

16

30

1

40

41

60 61

80

1

21 20

IC101

IC103

CN102

TP(PF)

TP(VC)