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– 17 –

z

Test mode PLAY status

Connection Point : CD board (Conductor side)

Check to see that the jitter is less than 9.0 nsec. and RF level is
between 0.7 – 1.1Vp-p.

Connect power supply cord or insert dry batteries, short Test
point (TEST-1) on the key board. (You need a moment for the
short) (Power button is possible with both of ON or OFF to en-
ter test mode).
The LCD display changes as in the diagram and the unit goes
into test mode.

When you press the u key, the CD rotates and when you press
theu key again, the CD plays (the track servo comes on) (but
no sound is issued).
Pressing the u key starts automatic adjustment and the value
changes, but ignore this value.

[KEY BOARD] (Conductor side)

h

PGM

MEGA BASS

cd

RF level: 
0.7–1.1 Vp-p

VOLT/DIV : 200mV (using 10:1 probe)
TIME/DIV : 500ns

E  C  B

JW610

JW606

D603

D602

R60

7

R606

R605

R604

R603

R602

Q603

S618

JW609

CN806

BAND

x

x

11

(11)

1-678-260-

TEST-1

1

4

TEST-1

SHORT : TEST MODE

OPEN : NORMAL MODE

TP(RF)

IC701

oscilloscope

(AC range)

   TP (RF)

JW741

 (VC)

 

(Conductor side)

With the unit in test mode, when you press the POWER button
to OFF, power is off and test mode ends.

– 18 –

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

swab :

record/playback/erase head

pinch roller

rubber belts

capstan

2. Demagnetize the record/playback/erase head with a head demag-

netizer.

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.

Torque

Torque Meter

Meter Reading

3.54 to 5.98 mN • m

Forward

CQ-102C

(36 to 61 g • cm)

(0.5 to 0.84 oz • inch)

0.2 to 0.58 mN • m

Forward

CQ-102C

(2 to 6 g • cm)

Back Tension

(0.028 to 0.083 oz • inch)

3.54 to 5.98 mN • m

Reverse

CQ-102RC

(36 to 61 g • cm)

(0.5 to 0.84 oz • inch)

0.2 to 0.58 mN • m

Reverse

CQ-102RC

(2 to 6 g • cm)

Back Tension

(0.028 to 0.083 oz • inch)

5.99 to 14.02 mN • m

FF/REW

CQ-201B

(61 to 143 g • cm)

(0.85 to 1.98 oz • inch)

 Mode

Tension Meter

Meter Reading

FWD

CQ-403A

more than 100g

(more than 3.53 oz)

REV

CQ-403A

more than 100g

(more than 3.53 oz)

z

Test mode PLAY status

Connection Point : CD board (Conductor side)

Press the M or m from test mode PLAY status.
Check to see that the traverse signal level is between 200 to
500mVp-p.

Extend the sweep time
for easier view.

200 – 500mVp-p

A

A

B

B

A = B

0V

0V

TP(RF)

IC701

 

(Conductor side)

oscilloscope

(AC range)

IC701 

rg

 pin(TO)

JW741 (VC)

– 19 –

3. Phase Check

Mode : FWD playback

4. Change the reverse playback mode and repeat the step 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable

locking compound.

Adjustment Location : – record/playback/erase head –

°

°

°

°

Ω

Ω

0dB = 0.775V

1. The adjustnemts should be performed in the order in the service

manual. (As a general rule playback circuit adjustment should
be completed beforeming recording circuit adjustment.)

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

CH unless otherwise indicated.

Input terminal

LINE IN

source impedance

10k

Ω

input signal level

0.5V (–3.8dB)

Output terminal

LINE OUT

load impedance

47k

Ω

output signal level

0.5V (–3.8dB)

Type

Signal

Used for

P-4-A100

10kHz, –10dB

Azimuth Adjustment

WS-48B

3kHz,

0dB

Tape Speed Adjustment

Procedure :
1. Mode : FWD playback

2. Turn the adjustment screw for the maximum output levels. If

these levels do not match, turn the adjustment screw until both
of  output levels match together within 1dB.

Ω

– 20 –

RADIO BAND button : FM
Volume : MIN

Adjustment Location : Tuner board (See page 21)

• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1

450kHz

MW  FREQUENCY COVERAGE  ADJUSTMENT

Adjust part

Frequency display

reading on digital

voltmeter.

 

Confirmation

  531kHz

Standard value : 0.5 – 1.5V

1,611kHz

Standard value : 4.6 – 5.8V

MW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 – 1

621kHz

CT3

1,404kHz

RADIO BAND button : MW or LW
Volume : MIN

µ

Ω

+
–

0dB = 1

µ

V

– FWD Playback Mode –

Ω

1. Set to FWD playback mode.
2. Adjust M691 (capstan/reel motor) so that the frequency counter

reading becomes 3,000Hz.

    Standard value : 2,970 to 3,030Hz
3. Set to REV playback mode.

Confirm the frequency should be within the standard value.

4. Confirm the frequency difference between beginning and the

end of tape should be within 1.5% (45Hz).

Adjustment Location : M691 (capstan/reel motor)

LW FREQUENCY COVERAGE  ADJUSTMENT

Adjust part

Frequency display

reading on digital

voltmeter

Confirmation

153kHz

Standard value : 0.2 – 0.9V

L4

279kHz

Adjustment value : 5.0V

Standard value : 4.9 – 5.1V

LW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 – 2

162kHz

CT5

261kHz