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11

• This mode is used to switch ON and OFF the VACS (Variable

Attenuation Control System).

Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons x ,  DISPLAY

and  GROOVE  simultaneously.

3. Press  CD SYNC  button while pressing  DISPLAY  button.

The message “VACS OFF” or “VACS ON” appears.

4. To exit from this mode, press  ?/1  button to turn the set OFF.

• This mode is used to test the function of the equalizer.

Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  DISPLAY

and  GROOVE  simultaneously.

3. Press  

m

  button while pressing  DISPLAY  button. The message

“BASS + 0” is displayed.

4. The value increases like + 2, + 4 ... if pressing  >  button

while  DISPLAY  button is still depressed, or it decreases like -
2, - 4 ... if pressing  . button.

5. Press   

M

   button while pressing DISPLAY button. The message

“TRE  + 0” is displayed.

6. The value increases like + 2, + 4 ... if pressing  >  button

while  DISPLAY  button is still depressed, or it decreases like
- 2, - 4 ... if pressing  . button.

7. To exit from this mode, press  ?/1  button to turn the set OFF.

• This mode moves the pickup to the position durable to vibra-

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

Procedure:
1. Press ?/1 button to turn the set ON.
2. Press  CD  button and  ?/1   button simultaneously.
3. The "STANDBY" display blinks instantaneously, and the CD

ship mode is set.

• All fluorecent segments and LEDs are tested.

Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  DISPLAY

and  GROOVE  simultaneously.

3. Press DISPLAY and DISC SKIP/EX-CHANGE buttons

simultaneously.

4. All segments and LEDs (without STANDBY LED) are turned

on.

5. To exit from this mode, press  ?/1  button to turn the set OFF.

• The version or destination is displayed.

Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  DISPLAY

and  GROOVE  simultaneously.

3. Press  DISPLAY  and  DISC 1  buttons simultaneously.
4. The version is displayed.
5. Press  DISPLAY  and  DISC 2  buttons simultaneously.
6. The destination is displayed.
7. To exit from this mode, press  ?/1  button to turn the set OFF.

• Keyboard check.

Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  DISPLAY

and  GROOVE  simultaneously.

3. Press  DISPLAY  and  DISC 3  buttons simultaneously, and the

key check mode is activated.

4. In the key check mode, the fluorecent indicator displays “KEY

0 VOL 0”. Each time a button is pressed, “KEY 0” value
increases. However, once a button is pressed, it is no longer
taken into account.
“VOL 0” value increases like 1, 2, 3 ... if rotating  VOLUME
knob clockwise, or it decreases like 0, 9, 8, ... if rotating counter-
clockwise.

5. To exit from this mode, press  ?/1  button to turn the set OFF.

• This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the pickup.

Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. To enter the test mode, press three buttons x ,  DISPLAY , and

GROOVE  simultaneously.

4. Press  DISPLAY  and  OPEN/CLOSE  buttons simultaneously.
5. The CD service mode is selected.
6. With the CD in stop status, press 

M

 button  to move the pickup

to outside track, or press 

m

 button to inside track.

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

1) Move the pickup to the most inside track.
2) Press  ?/1  button to turn the set OFF.

 • Always move the pickup to most inside track when exiting from

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

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

chipped.

+

–

–

+

12

Procedure:
1.

Supply a 98 MHz signal at 28 dB from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Adjust RV101 to the point (moment) when the TUNED
indicator will change from going off to going on.

Adjustment Location: MAIN board

Procedure:
1.

Supply a 98 MHz signal at 60 dB from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Measure voltage between pin 21 and pin 23 of IC 101.  Adjust
T101 until the voltage becomes 0 V.

Adjustment Location: MAIN board

FM RF Signal generator

75 

Ω

 coaxial

Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 30 dB  (at 75 

Ω

 open)

FM ANTENNA terminal
(JK101)

set

FM RF Signal generator

75 

Ω

 coaxial

Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 60 dB  (at 75 

Ω

 open)

FM ANTENNA terminal
(JK101)

set

T101

RV101

IFT101 : AM IF

T101:NULL

RV101:FM TUNED LEVEL

AM RF Signal generator

30% amplitude
modulation by
400Hz signal
output level : as low as possible

AM ANTENNA terminal
(JK101)

set

Procedure:
1.

Set the frequency of the AM RF signal generator to 1000 kHz
(at 10 kHz step) or 999 kHz (at 9 kHz step).

2.

Tune the set to AM 1000 kHz (at 10 kHz step) or 999 kHz (at 9
kHz step).

3.

Adjust IFT101 so that the reading on level meter becomes in
maximum.

Ω

13

CN732

CN733

CN731

TP connected to pin 

q;

 (IC751)

            C746A

Adjustment Location: CD board

[CD BOARD] (Component Side)

Procedure :
1. Connect oscilloscope to pin q; (IC751).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

q; 

Note :

Clear RF signal waveform means that the shape “ 

◊ ” can be clearly

distinguished at the center of the waveform.

Note :

1. CD Block is basically designed to operate without adjustment.

Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M

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.

14

Note on Schematic Diagram:
• All capacitors are in 

µ

F unless otherwise noted.  pF: 

µµ

F

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.

•

f

: internal component.

•

C

: panel designation.

• X

: parts extracted from the component side.

• b

: Pattern from the side which enables seeing.

• Indication of transistor.

•

A

: B+ Line.

•

B

: B– Line.

•

H

: adjustment for repair.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

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

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.
no mark : FM
<

 

 

> :  CD

[

] : TAPE

• Waveforms are taken with a oscilloscope.

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

• Circled numbers refer to waveforms.

• Signal path.

F

: FM

E

: PB (DECK A)

d

: PB (DECK B)

G

: REC (DECK B)

J

: CD

C

B

These are omitted.

E

Q

B

These are omitted.

C

E

Q

Note: The components identified by mark 

0

 or dotted line

with mark 

0

 are critical for safety.

Replace only with part number specified.

MOTOR board

ADDRESS SENSOR board

DRIVER board

TRANS board

VIDEO OUT board

SPDL board

SUB TRANS board 

MAIN board

POWER board

PANEL board

CD board