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9

 Follow the installation procedure in the numerical order given.

1

 Align the pointer with the groove of “cabinet (front) sub ASSY” and insert it as shown in the illustration.

2

 Align knob (TU) with “cabinet (front) sub ASSY” and fasten the screw.

3

 Turn the tuning knob fully in the direction of the allow as shown in the illustration.

4

 Turn the tuning capacitor gear fully in the direction of the allow as shown in the illustration.

5

 Fasten the “cabinet (front) sub ASSY” and cabinet (rear) with the screws.

1

 Pointer

knob (Tu)

Cabinet (front) sub ASSY 

2

 Screw (+BVTP 2.6 

×

 8)

3

 Tuning knob

4

 Tuning capacitor gear

5

Cabinet (rear)

Cabinet (front) sub ASSY

10

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

swab :

record/playback head

pinch roller

erase head

rubber belts

capstan

2. Demagnetize the record/playback head with a head

demagnetizer. (Do not bring the head demagnetizer close to
the erase head.)

3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power

supply voltage (9V) unless otherwise noted.

Torque

Torque Meter

Meter Reading

1.77 – 5.88 mN•m

Forward

CQ-102C

(18 – 60 g•cm)

(0.25 – 0.83 oz•inch)

Forward

0.1 – 0.49 mN•m

Back Tension

CQ-102C

(1.0 – 5.0 g•cm)

(0.014 – 0.069 oz•inch)

4.42 – 9.31 mN•m

Fast Forward

CQ-201B

(45 – 95 g•cm)

(0.62 – 1.32 oz•inch)

4.42 – 9.31 mN•m

Rewind

CQ-201B

(45 – 95 g•cm)

(0.62 – 1.32 oz•inch)

Torque Meter

Meter Reading

CQ-403A

more than 60g

(more than 2.12 oz)

Output terminal

HP OUT

load impedance

32 

Ω

output signal level

0.25V (–10dB)

Type

Signal

Used for

WS-48A

3kHz, 0dB

Tape Speed Adjustment

Mode : Playback

Adjustment Value : 3,000Hz
Standard Value : 2,940 - 3,060Hz

Frequency difference between the beginning and the end of the
tape should be within 1.5% (45Hz).

 0dB = 0.775V

Ω

Adjustment Location : Mechanism deck

Function switch

: LW

Volume

: MIN

Function switch

: FM

Volume

: MIN

µ

Ω

 0dB = 1 

µV

11

•

Repeat the procedures in each adjustment several times, and
the frequency coverage and tracking adjustments should be
finally done by the trimmer capacitors.

LW IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T2

455kHz

LW FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L4

145kHz

CT4, CV2

300kHz

LW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3

160kHz

CT3, CV3

260kHz

FM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1

10.7MHz

FM FREQUENCY COVERAGE  ADJUSTMENT

Adjust for a maximum reading on level meter.

L2

87.0MHz

CT2

108.3MHz

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1

87.0MHz

CT1

108.3MHz

Adjustment Location : Main board (See page 12)

1. Set the function switch to power off.
2. Set the function switch to CD.
3. Set Test mode by momentarily shorting both of the IC801 51pin

to GND. (Shorting the terminals momentarily is sufficient).
The set is into CD test mode (88 is displayed).

4. Turn the power off to release test mode.

R812

R811

R809

R810

 

R851

C844

C

8

C8

4

R815
R814
R813

 

C801

 

IC801

R816

R

C810

 

C317

W

321

C802

GND

51pin

TEST mode : momentarily short

[MAIN BOARD] (Conductor side)

CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.

1. Connect the oscilloscope between TP (RF) and GND on CD

board.

2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the 7 button two times (LPC ON).
4. Confirm that the 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.

• RF Signal Reference Waveform (eye pattern)

When observing the eye pattern, set the oscilloscope for AC
range and raise certical sensitivity

IC701

 

R729

R708

C736

C734

R709

C705

R704

R702

R711

R710

R703

R705

R701

C703

TP

(RF)

C731

R706

JC703

 

C743

C7

C742

 

 

C

707

 

 

 

9

38

732

JW708

W

709

J

C74

oscilloscope

(AC range)

[CD BOARD] (Conductor side)

(GND)

TP (RF)

12

[MAIN BOARD]
(Component side)

[MAIN BOARD]
(Conductor side)

CT1 : FM Tracking Adjustment

CT3 : LW Tracking Adjustment

L3: LW Tracking Adjustment

T2 : LW IF Adjustment

T1 : FM  IF Adjustment

L2 : FM Frequency Coverage Adjustment

CT4: LW Frequency 
        Coverage Adjustment

CT2 : FM Frequency
          Coverage Adjustment

L4 : LW Frequency 
       Coverage Adjustment

CV2 : LW Frequency Coverage Adjustment

CV3 : LW Tracking Adjustment

L1 : FM Tracking Adjustment