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— 5 —

Disassemble the unit in the order as shown below.

Follow the disassembly procedure in the numerical order given.

Set

"Cabinet (rear) assy", "lid sub assy, cassette"

Main board, Mechanism deck

Belt

Head

Motor, dc

1

 Two screws(+B1.7 

×

 9)

2

 Two screws(+B1.7 

×

 9)

4

 Remove speaker cable (4pcs)

5

 PWB, LED Flexible

6

 Shaft(A), stopper

7

 Screw, ornamental

8

 Screw, ornamental

9

 Lid Sub Assy, Cassette

Claws

3

 Remove the Cabinet (rear) assy 

     in the direction of the allow

Claws

5

 PC board, Motor flexible

1

 Three screws(IB LOCK)

8

 Mechanism deck

6

 PC board, Head flexible

3

 Two screws(M1.4), Toothed lock

7

 MAIN board

2

4

NOTE: For attaching the Main board,

refer to the next page.

— 6 —

1

 Belt(motor)

Belt(motor)

2

 Belt(flywheel)

Belt(flywheel)

3

 Belt(counter)

Belt(counter)

• How to thread the belt

1

 two screws

2

 head, magnetic

     (REC/PB/ERASE)

— 7 —

— 7 —

MAIN board

S303

S302

S701

Mechanism deck

• Attach the knobs of the switches S302, S303, and S701 on the Main board

while aligning them with the claws of the REC lever, write-protection 2
lever, and the PAUSE lever respectively.

PAUSE lever (align it with S701)

Write-protection lever
(align it with S303)

REC lever
(align it with S302)

3 Remove the four solders.

1 screw (1.4)

2 screw (1.4)

4 Motor, DC

— 8 —

— 8 —

1. Perform adjustments on the following conditions unless

otherwise specified.
• Switches and controls positions

VOL knob ···························································· Maximum
SPEED CONTROL knob ······················· Mechanical center
V•O•R switch ································································ OFF
REC TIME switch ···················································· Normal

Tape Speed Adjustment
Procedure :
Mode : Playback (FWD)

Adjust RV602 (standard)/RV603 (double speed) until the frequency
counter reading
becomes 3,000 Hz at the standard mode and 1,500 Hz at the double
speed mode.

Frequency difference between the beginning and the end of the
tape should be within 1% (30Hz).
Upon completion of adjustments, select the REV playback mode
and check that the measurement value is within the specifications.

Test Tape

WS-48A

Used for

Tape speed adjustment

Signal

3kHz, 0dB

1.

Clean the following parts with a denatured-alchool-moistened
swab:

record/playback/erase head pinch roller
head

rubber belts

capstans

idlers

2.

Demagnetize the record/playback/erase 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.

After the adjustments, apply suitable locking compound to the
parts adjusted.

5.

Unless specified otherwise, use a specified voltage (3.0V) to
perform the adjustments.

Meter Reading

20 – 35g•cm

0.28 – 0.48 oz•inch

0.5 – 5.0g•cm

0.007 – 0.07 oz•inch

20 – 35g•cm

0.28 – 0.48 oz•inch

0.5 – 5.0g•cm

0.007 – 0.07 oz•inch

more than 40g•cm

more than 0.5 oz•inch

Mode

FWD

FWD

back tension

FWD

FWD

back tension

FF

REW

Torque Meter

CQ-102C

CQ-102RC

CQ-201B

0dB = 0.775V

16 

Ω

set

Headphone jack(J303)

+

–

test tape 
WS-48A
(3kHz, 0dB)

digital frequency
counter

RV602(NORMAL)

RV603(HIGH)

Digital frequency counter

2,970 – 3,030Hz

1,485 – 1,515Hz

Tape speed

RV602(Normal)

RV603(High)