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21

*

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  POWER  button to turn off the main power.
2. While depressing the  x  button, press the  POWER  button.
3. The fluorescent indicator tube does not display any message

and the set is reset.

*

The version of the microcomputer is displayed.

Procedure:
1. Press the  POWER  button to turn the set on.
2. To enter the test mode, press two buttons  x    and  POWER

simultaneously for more than five seconds. The version of the
microcomputer is displayed.

*

All fluorecent segments are tested.

Procedure:
1. Insert a disc, and extract an AC plug.
2. While depressing the  u  (CD)  button, insert an AC plug to

enter the test mode.

3. The message “CD TEST” is displayed, the initialization is

performed.

Then all segments of the fluorecent indicator tube are turned on.

*

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  POWER  button to turn the set on.
2. Set the FUNCTION to CD.
3. Press the  x  button for more than five seconds.
4. After a message “MECHA LOCK” is displayed on the

fluorescent indicator tube, the CD ship mode is set and the power
is turned off.

The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Setting Procedure :
1. Press the  POWER   button to turn the set on.
2. Press two buttons of  x  and  Z  (CD EJECT) simultaneously

for five seconds.

3. The message “LOCKED” is displayed and the tray is locked.
Releasing Procedure :
1. Press two buttons of  x  and  Z  (CD EJECT) simultaneously

for five seconds again.

2. The message “UNLOCKED” is displayed and the tray is

unlocked.

Note : When “LOCKED” is displayed, the tray lock is not released
by turning power on/off with the  POWER  button.

*

This mode is used to check the function of the amplifier.

Procedure:
1. Extract an AC plug.
2. While depressing the  AUX  button, insert an AC plug to enter

the AMP test mode. The message “AMP TEST” is displayed.

3. The message “Volume MAX” is displayed, when the  VOLUME

knob is rotated clockwise. The message “Volume 0” is displayed,
when the  VOLUME  knob is rotated counterclockwise.

4. Each time the  BASS  or  TREBLE  knob is turned, the message

“EQ MAX”, “EQ MIN” or  “EQ FLAT” is displayed in this
order.

*

Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step. (EXCEPT AEP,UK)

Procedure:
1. Set the FUNCTION to AM.
2. While depressing the  TUNER  button, press the  POWER

button.

3. The channel step is changed over.

*

This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.

Procedure:
1. Extract an AC plug.
2. While depressing the  u  (CD)  button, insert an AC plug to

enter the CD test mode. The message “CD TEST” is displayed.

3. With the CD in stop status, press the  >  button to move the

pickup to outside track, or press the  .    button to inside
track.

4. When press the  u    (CD)  button, normal playback is

performed.

5. Each time the  u    (CD)  button is pressed during normal

playback, the tracking servo is switched on or off.

6. To exit this mode, either change to other functions or extract

an AC plug.

Procedure:
1. Press the  POWER  button to turn the set on.
2. Select the FUNCTION to CD.
3. Press two buttons of  >  and  u  (CD) simultaneously.
4. The repeat all mark blinks and then repeat 5 times limit is

released.

22

•

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

demagnetizer.

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

supply voltage unless otherwise noted.

2.94 – 7.84 mN • m

(30 to 79 g • cm)

(0.42 – 1.11 oz • inch)

0.15 – 0.6 mN • m

2 to 6 g • cm

(0.03 – 0.08 oz • inch)

2.94 – 7.84 mN • m

(30 to 79 g • cm)

(0.42 – 1.11 oz • inch)

2.94 – 7.84 mN • m

(30 to 79 g • cm)

(0.42 – 1.11 oz • inch)

6.86 – 17.64 mN • m

(70 to 179 g • cm)

(0.98 – 2.49 oz • inch)

9.8 mN • m

(100 • cm or more)

(1.4 oz • inch or more)

9.8 mN • m

(100 • cm or more)

(1.4 oz • inch or more)

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

FWD

FWD
back tension

REV

REV
back tension

FF/REV

FWD tension

REV tension

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

Tape

Signal

Used for

P-4-A100

10 kHz, – 10 dB

Azimuth Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Check

0 dB = 0.775 V

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.

Screw
position

L-CH
peak

within
1dB

Output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
position

R-CH
peak

Procedure:
1. Mode: Playback

set

MAIN board
SPEAKER terminal (J201)
L-CH, R-CH

+
–

level meter

test tape
P-4-A100
(10 kHz, – 10 dB)

23

3. Mode: Playback

4. After the adjustments, apply suitable locking compound to the

parts adjusted.

Adjustment Location: Record/Playback/Erase Head

set

test tape
P-4-A100
(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 terminal (J201)
L-CH

Procedure:
1.

Record mode

2.

Mode:  Playback
i-Bass OFF
BASS 0
TREBLE 0

3.

Confirm playback the signal recorded in step 1 become
adjustment level as follows.

4.

If these levels do not adjustment level, adjustment the SFR451
(L-CH) and SFR452 (R-CH) to repeat steps 1 and 4.

Adjustment level: Playback output of 315 Hz to playback output

of 10 kHz:  0 

± 1.0 dB (0 ± 4.5mV).

Adjustment Location: MAIN board

[MAIN  BOARD] – Component Side –

+
–

set

recorded
portion

MAIN board speaker terminal (J201)

level meter

attenuator

set

MAIN board
AUX IN (J602)

1) 315 Hz
2) 10 kHz

50 mV (–23.8 dB)







600 

Ω

blank tape
CN-123

AF OSC

Mode: Playback

1. Insert the WS-48B into the deck.
2. Press the N button on the deck.
3. Confirm that the frequency counter reads 3,000 

± 90 Hz.

Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)

(WS-48B)

+
–

set

test tape
WS-48B 
(3 kHz, 0 dB)

MAIN board
SPEAKER terminal (J201)
L-CH, R-CH

frequency counter

Note: Refer to “3-6. Cassette Panel” (see page 9)

adjustment screw

SFR452
Record Bias
Adjustment(R-CH)

SFR451
Record Bias
Adjustment(L-CH)

IC601

IC901

24

       RFDC signal waveform

Checking Location: CD board (Conductor side)

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

Ω impedance.

3. Clean the object lens by an applicator with neutral detergent when the

signal level is low than specified value with the following checks.

Procedure:
1.

Connect an oscilloscope to test point TP (RFDC) and TP (VC)
on the BD board.

2.

Turn the power on.

3.

Put the disc (YEDS-18) in to playback the number five track.

4.

Confirm that oscilloscope waveform is clear and check RFDC
signal level is correct or not.

A clear RFDC signal waveform means that the shape “

◊” can be

clearly distinguished at the center of the waveform.

+
–

BD board

TP (RFDC)

TP (VC)

oscilloscope

VOLT/DIV: 200 mV
TIME/DIV: 500 ns 

level: 0.6 

±

 0.15 Vp-p

Procedure:
1.

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

2.

Turn the power on.

3.

Put the disc (YEDS-18) in to playback the number five track.

4.

Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.

A clear RFAC signal waveform means that the shape “

◊” can be

clearly distinguished at the center of the waveform.

       RFAC signal waveform

Checking Location: BD board (Side B)

+
–

BD board

TP (RFAC)

TP (VC)

oscilloscope

VOLT/DIV: 200 mV
TIME/DIV: 500 ns 

level: 1.0 

±

 0.4 Vp-p

Procedure:
1.

Connect an oscilloscope to test point TP (FE) and TP (VC)
on the BD board.

2.

While depressing the          (CD) button, insert an AC plug.

3.

Put the disc (YEDS-18) in and press the       (CD) button 
and actuate the focus search. (actuate the focus search when
disc table is moving in and out)

4.

Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2 

± 1

Vp-p.

S-curve waveform

• Try to measure several times to make sure than the ratio of A : B

or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the

brightness to obtain best waveform.

Checking Location: BD board (Side B)

+
–

BD board

TP (FE)

TP (VC)

oscilloscope

A

B

symmetry

within 2 

±

 1 Vp-p

u

x