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– 13 –

• 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. Turn the power ON or set to the DEMO mode.
2. Press three buttons of

p , 

[ENTER/NEXT]

, and

1/

u

 simulta-

neously.

3. The set is reset, and displays “COLD RESET”, then becomes

DEMO mode.

• This mode resets the set with the preset data kept stored in the

memory. The hot reset mode functions same as if the power
cord is plugged in and out.

Procedure:
1. Turn the power ON or set to the DEMO mode.
2. Press three buttons of

p , 

[ENTER/NEXT]

, and 

[DISC 1]

 si-

multaneously.

3. The set is reset, and becomes standby state.

• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the

1/

u

button to turn the power ON.

2. Select the function “TUNER”, and press the 

[TUNER/BAND]

button to select the BAND “AM (MW)”.

3. Press the

1/

u

button to turn the power OFF.

4. Press the 

[ENTER/NEXT]

 and

1/

u

buttons simultaneously,

and the display on the fluorescent indicator tube changes to
“AM 9 k STEP” or “AM 10 k STEP”, and thus the tuning
interval is changed over.

• 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/

u

button to turn the power ON.

2. Press the 

[CD LOOP]

 and

1/

u

buttons simultaneously.

3. A message “LOCK” is displayed on the fluorescent indicator

tube, and the CD delivery mode is set.

Procedure:
1. Press three buttons of

p , 

[ENTER/NEXT]

, and 

[DISC 2]

 si-

multaneously.

2. LEDs and fluorescent indicator tube are all turned on.

Press the 

[DISC 2]

 button, and the key check mode is acti-

vated.

3. In the key check mode, the fluorescent indicator tube displays

“K 0 J0 V0”. Each time a button is pressed, “K” value in-
creases. However, once a button is pressed, it is no longer taken
into account.
“J” value increases like 1, 2, 3 ... if turn the JOG dial clock-
wise, or it decreases like 0, 9, 8 ... if turn the JOG dial counter-
clockwise.
“V” value increases like 1, 2, 3 ... if turn the 

[VOLUME]

 dial

clockwise, or it decreases like 0, 9, 8 ... if turn the JOG dial
counterclockwise.

4. To exit from this mode, press three buttons in the same man-

ner as step 1, or disconnect the power cord.

– 14 –

This mode can be used for operation check of tape deck section.
Tape deck section work in parallel.
• If an error occurred:

The aging operation stops and display then status.

• If no error occurs:

The aging operation continues repeatedly.

Procedure:
1. Load the tapes into the decks A and B respectively.
2. Press the 

[FUNCTION]

 button to select the function “CD”.

3. Press the 

[PLAY MODE]

 button to set the “ALL DISCS” mode,

and press the 

[REPEAT]

 button to “REPEAT” off.

4. Press three buttons of

p  , 

[ENTER/NEXT]

, and 

[DISC SKIP/

EX-CHANGE]

 simultaneously.

5. The aging mode is activated, if the indicator of disc tray num-

ber on the fluorescent indicator tube is blinking.

6. To exit from the aging mode, press the

1/

u

button to turn the

power OFF and operate the cold reset. (Refer to the “MC Cold
Reset”)

1. Display at the Aging Mode

• Display operating state of tape deck section alternately.
• If an error occurred, stop display.

2. Tape Deck Section

• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.

Rewind the tape A and B

“TAPE A AG-1”

Shut off

FWD play the tape A

“TAPE A AG-2”

2 minutes

Fast forward the tape A

“TAPE A AG-3”

Shut off or 20 seconds

REV play the tape A

“TAPE A AG-4”

2 minutes

Rewind the tape A

“TAPE A AG-5”

Shut off

FWD play the tape B

“TAPE B AG-2”

2 minutes

Fast forward the tape B

“TAPE B AG-3”

Shut off or 20 seconds

REV play the tape B

“TAPE A AG-4”

2 minutes

Rewind the tape B

“TAPE B AG-5”

Shut off

 “TAPE 

*

 AG-

*

” is display of each step.

– 15 –

On this mode, the data of the color-bars signal as a picture signal
and the 1 kHz sine wave signal as a sound signal are output by the
mechanism controller (IC502) for the video CD signal check.
When measurement of the voltage and waveform on the VIDEO
board, perform it in this mode.
For reference, the color-bars signal can be observed at J302
(VIDEO OUT) and the sound signal can be observed at J101
(VIDEO/MD (AUDIO) OUT) using an oscilloscope.
Procedure:
1. Short the both ends of the land of SL503 of the VIDEO board.
2. Turn the power on. Press the 

[FUNCTION]

 button to select

CD.

3. The color-bars appears when the CD is in stop status, and it

disappears when the CD goes in play status.

4. After measuring, remove the lead wire connected.

D502

SL501

SL503

SL502

IC505

SL503

IC502

CN501

CN503

SL502

SL501

– 16 –

1. Demagnetize the record/playback head with a head demagne-

tizer.

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 ad-
justment 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 other-

wise specified.

8. Set to  the DOLBY NR OFF.
9. Set to the test mode.

(1) Press the

1/

u

button to turn the power ON.

(2) Select the function “TAPE A or B”.
(3) Press the button of

p , 

[ENTER/NEXT]

, and 

[DISC 3]

simultaneously, to set the tape deck test mode and blink
the indicator of disc tray number on the fluorescent indi-
cator tube.

(4) To exit from the test mode, press the

1/

u

button.

• Test Tape

 Perform this adjustments for both decks

Procedure:
1. Mode: Playback (FWD)

Tape

Signal

Used for

P-4-A100

10 kHz, – 10 dB

Azimuth Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Adjustment

P-4-L300

315 Hz, 0 dB

Level Adjustment

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

2 to 6 g • cm

(0.03 – 0.08 oz • inch)

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

2 to 6 g • cm

(0.03 – 0.08 oz • inch)

71 to 143 g • cm

(0.99 – 1.99 oz • inch)

100 g or more

(3.53 oz or more)

100 g or more

(3.53 oz or more)

1. Clean the following parts with a denatured alcohol-moistened

swab:

record/playback heads

pinch rollers

erase head

rubber belts

capstan

idlers

2. Demagnetize the record/playback head with a head demagne-

tizer.

3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power sup-

ply voltage unless otherwise noted.

Mode

FWD

Torque meter

CQ-102C

Meter reading

FWD
back tension

REV

REV
back tension

FF/REW

FWD tension

REV tension

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

0 dB = 0.775 V

set

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

+
–

level meter

test tape
P-4-A100
(10 kHz, – 10 dB)