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17

• This mode is used to check operations of Amplifier.
Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press three keys of 

[DSG]

, 

[REPEAT]

  and 

[DISPLAY]

simultaneously.

3. When the CMN (MC) test mode is activated, “s” blinks on

the liquid crystal display.

4. Turn the 

[BASS]

  knob counterclockwise, “TONE MIN” is

displayed on the liquid crystal display. Turn the 

[BASS]

 knob

clockwise, “TONE MAX” is displayed on the liquid crystal
display.
Turn  the 

[TREBLE]

  knob clockwise or counterclockwise,

“TONEFLAT” is displayed on the liquid crystal display.
 Turn the 

[VOLUME]

 knob counterclockwise, “VOL MIN” is

displayed on the liquid crystal display. Turn the 

[VOLUME]

knob clockwise, “VOL MAX” is displayed on the liquid crystal
display.

5. To release this mode, press the

?/1

key.

• This mode is used to check the liquid crystal display, LED,

model, destination, software version and key.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press three keys of 

[DSG]

, 

[PLAY MODE]

 and 

[DISPLAY]

simultaneously.

3. Liquid crystal display and LEDs are all turned on.
4. When you want to enter the model, destination and version

display  mode, press the 

[REPEAT]

  key.  The model and

destination are displayed alternately on the liquid crystal display.

5. Each time 

[REPEAT]

 key is pressed, the display changes starting

from MD version, MC version, GC version, CD version, CDD
version, CDMA version, CDMB version, BDA version, BDB
version, ST version, TA version, TM version, and TC version
this order, and returns to the MD version display on the liquid
crystal display.

6. When 

[FUNCTION]

 key is pressed while the version numbers

are being displayed except model and destination, year, month
and day of the software creation display. When 

[FUNCTION]

key is pressed again, the display returns to the software version
display. When 

[REPEAT]

 key is pressed while year, month and

day of the software creation are being displayed, the year, month
and day of creation of the software versions are displayed on
the liquid crystal display in the same order of version display.

7. Press the 

[PLAY MODE]

 key, the key check mode is activated.

8. In the key check mode, the liquid crystal display displays “K

0

”.

Each time a key is pressed, “K” value increases. However, once
a key is pressed, it is no longer taken into account.

9. To release this mode, press three keys in the same manner as

step 2, or disconnect the power cord.

• The cold reset clears all data including preset data stored in the

RAM to initial conditions. Execute this mode when returning
the set to the customer.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press three keys of

?/1

,

x

(CD) and

x

(TAPE) simultaneously.

3. The liquid crystal display becomes blank instantaneously, and

the set is reset.

• 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 the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Press three keys of

  Z

    (CD),

x

    (CD) and 

[DISPLAY]

simultaneously.

4. After the “STANDBY” display blinks, “LOCK” is displayed

on the liquid crystal display, and the ship mode is set.

• 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 the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Press three keys of

Z

(CD),

CD NX

and 

[DISPLAY]

simultaneously.

4. After the “STANDBY” display blinks, “LOCK” is displayed

on the liquid crystal display, and the ship mode is set.

• This mode is used to unable to take sample disc out of tray in

the shop.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. While pressing the

Z

  (CD) key, press the

x

  (CD) key for 5

seconds.

4. The message “LOCKED” is displayed on the liquid crystal

display and the tray is locked. (Even if pressing the

Z

  (CD)

key, the message “LOCKED” is displayed on the liquid crystal
display and the tray is locked)

5. To release from this mode, pressing the

Z

  (CD) key, press the

x

  (CD) key for 5 seconds.

6. The message “UNLOCKED” is displayed on the liquid crystal

display and the tray is unlocked.

• A step of AM channels can be changed over between 9 kHz and

10 kHz.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “TUNER”, and press the

[BAND]

 key to select “AM”.

3. Press the

?/1

key to turn the power OFF.

4. Press two keys of

?/1

and

M

 

L

simultaneously.

5. The message “AM 9K STEP” or “AM 10K STEP” is displayed

on the liquid crystal display, and thus the channel step is changed
over.

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

instance, when cleaning the optical pick-up.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Press three keys of 

[DSG]

 , 

[REPEAT]

 and

x

(TAPE) simul-

taneously.

4. Press the

M

 

L

key to move the optical pick-up to outside

track, or press the  

l

 

m

key to inside track.

5. To release this mode, press the

?/1

key.

18

• This mode can be used for operation check of CD section and

tape deck section.
CD section and tape deck section work in parallel.

The aging operation stops only an error occurred sections and
display then status.

The aging operation continues repeatedly.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Set disc on the tray and set tape into the deck.
4. Press the 

[REPEAT]

 key to “REPEAT” off.

5. Press three keys of 

[DSG]

, 

[PLAY MODE]

 and

x

(TAPE)

simultaneously.

6. Aging operations of CD and tape are started at the same time.
7. To release this mode, press the

?/1

key.

Display operating state of CD section and tape deck section
alternately.
If an error occurred, stop display which that section.

The sequence during the aging mode is following as below.
Display at the aging mode is the same as the normal operation.

Start

Disc chucking

TOC read

Play first track for 2 seconds

Play last track for 2 seconds

Open the disc tray

Close the disc tray

The sequence during the aging mode is following as below.
If an error occurred, stop display that step.
Display at the aging mode is “TAPE AG—”.

Start

Rewind the tape

Shut off

FWD play the tape

2 minutes

Fast forward the tape

Shut off or 20 seconds

REV play the tape

2 minutes

• This mode can be used for error display of CD section.
Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Press three keys of 

[DSG]

, 

[REPEAT]

 and

X

simultaneously.

Error code is not displayed on the liquid crystal display.

• This mode used to ckeck operation of optical pick-up.
Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Press three keys of 

[DSG]

, 

[PLAY MODE]

 and

X

  simultaneously.

4. When the CD servo test mode is activated, optical pick-up moves.

• Number of repeat for CD playback is 5 times when the repeat

mode is “REPEAT”. This mode is used to enables CD to repeat
playback for limitless times.

Procedure:
1. Press the

?/1

key to turn the power on.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Press three keys of 

[DSG]

, 

M

 

L

and

x

(TAPE)

simultaneously.

4. When the 5 repeat off mode is activated, “LIMIT OF” is

displayed on the liquid crystal display.

• This mode is used to enable function of external input to change

over between MD and VIDEO.

Procedure:
1.

Set to standby state.

2.

Press two keys of

?/1

and 

[FUNCTION]

 simultaneously.

3.

The function of external input changes over to MD or VIDEO.

19

Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.

1.

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

2.

The adjustments should be performed in the order given in this service
manual.

3.

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

Procedure:
1. Press the 

[FUNCTION]

 key to select “MD” or “VIDEO”.

2. Set the tape into the deck.
3. After pressing

z

 

REC

key,  press

X

(TAPE) key to start

recording.

4. Mode:  Record

5. Mode:  Playback

6. Confirm the playback signal recorded in step 3 becomes

adjustable level as follows.
If these levels are out of specified values, adjust the RV653 (L-
CH) and RV603 (R-CH) on the TC  board to repeat steps 4 and
5.

Specified values: Playback output of 315 Hz to playback

output of 10 kHz: 

± 2.0 dB

Adjustment Location: TC board

attenuator

set

MAIN board 
MD (VIDEO) IN jack (J101)
L-CH, R-CH

1) 315 Hz
2) 10 kHz

34.6 mV (– 27 dB)







600 

Ω

blank tape
CN-123

AF OSC

+
–

set

recorded
portion

SP OUT board
SPEAKER terminals (J701)
L-CH, R-CH

level meter

0 dB=0.775 V

Procedure:
1. Press the 

[FUNCTION]

 key to select “MD” or “VIDEO”.

2. Set the tape into the deck.
3. After pressing

z

 

REC

key,  press

X

(TAPE) key to start

recording.

4. Mode:  Record

5. Mode:  Playback

6. Confirm the play back signal recorded in step 3 becomes

adjustable level as follows.
If these levels are  out of specified values, adjust the RV652 (L-
CH) and RV602 (R-CH) on the TC board to repeat steps 4 and
5.

Specified values: Playback level 30.8 to 38.8 mV (–28 to –26 dB)
Adjustment Location:  TC board

set

MAIN board
MD (VIDEO) IN (J101) 
315 Hz, 34.6 mV (–27 dB)

blank tape
CS-123

600 

Ω

attenuator

AF OSC

+
–

set

recorded
portion

SP OUT board
SPEAKER terminals (J701)
L-CH, R-CH

level meter

(R-CH)

(L-CH)

RV603

(R-CH)

RV602

(L-CH)

RV652

RV653











REC Level Adjustment

REC Bias
Adjustment

20

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 pick -up block is
replaced.

Procedure :
1.

Connect oscilloscope to TP (RFAC) and TP (VC) on the BD
board.

2.

Press the

?/1

button to turn the power ON, and press the

Z

(CD) button to open the CD disc tray.

3.

Set disc (YEDS-18) on the tray and press the

CD

 

NX

button

to playback.

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.

s

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

level:
0.9 

±

 0.4 Vp-p

TP

(RFAC)

TP

(VC)

IC103

IC102

IC101