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– 8 –

1. Remove the mechanism cover, paying attention to the

pawls (A1) x 4 pcs.

2. Remove the screws (A2) x 2 pcs., to remove the shaft (A3)

x 1 pc.

3. Remove the stop washer (A4) x 1 pc., to remove the gear

(A5) x 1 pc.

4. Remove the pickup.

Perform steps 1, 10 and 11 of the disassembly method to
remove the CD mechanism. (See page 6.)

Pickup Unit

(A2) x2
ø2.6 x6mm

(A1) x2

CD Mechanism

Shaft
(A3) x1

Gear
(A5) x1

StopWasher
(A4) x1

Mechanism Cover

(A1) x2

1. Remove the screw (F1) x 1 pc., to remove the tape

mechanism PWB.

2. Remove the screws (F2) x 1 pc.
3. Remove the solder joints (F3) x 2 pcs., to remove the tape

mechanism PWB.

1. Remove the belt.
2. Remove the stop washer (E1) x 1 pc., with a small precision

screwdriver to extract the flywheel from the capstan metal.

Note:
When the stop washer is deformed or damaged, replace it
with a new one.

Install each part in the reverse order of the removal with care.

Stop
Washer

Driver

(E1)x1
Stop Washer

Mechanism
Chassis

Washerx2

Flywheel

Tape 
Mechanism
PWB

Tape 
Mechanism
PWB

(F3)x2
Solder
Joint

(F2)x1
ø2x8mm

(F1)x1
ø2x3mm

Note:
After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector remove to protect the optical pickup
from electrostatic damage.

– 9 –

Play: TW-2412

Over 80 g

Play: TW-2111

30 to 60 g. cm

Fast forward: TW-2231

55 to 140 g.cm

Rewind: TW-2231

55 to 140 g.cm

MTT-111

Variable

3,000 

±

Headphone

resistor in

90 Hz

terminal

motor.(M901)

87.5 MHz

87.5 MHz

3.4 V 

±

 1.0 V

TP301

108 MHz

108 MHz

7.8 V 

±

 1.0 V

TP301

• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated

IF

450 kHz

1,602 kHz

T351

*1

 AM Band

—

531 kHz

(fL): T306

*2

Coverage

1.1 

±

 0.1 V

AM

990 kHz

990 kHz

T302

*1

Tracking

fL: Low-renge frequency
fH: High-renge frequency

Signal generator: 400 Hz, 30%, AM modulated

98.00 MHz

98.00 MHz

VR351*1

Input: CNP301

(30 dB

µ

V)

Output: Speaker
Terminal

• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated

*1. Adjust so that an output signal appears.

TAPE MECHANISM

M901
Tape
Motor

Variable
resistor
in motor

IC303 

IC302 

FE301

CF352 

R336

T306

VR351 

T302

T351

MAIN PWB

FM Mute
Level

AM IF

TP301

CNP301

ANTENNA
SOCKET

FM

AM

SO301

AM
Tracking

AM Band
Coverage fL

*1. Input: Antenna

Output: Speaker terminal

*2. Input: Input is not connected

Output: TP301

– 10 –

2. CD Test Mode (TEST 1)
In the CD test mode the operation of each step is enabled even when the LID-SW is off. However, if focus cannot be set in step 3
or any error processing is started, it is impossible to proceed to the next step. When the error processing is started, operations other
than termination of test mode by pressing the ON/STAND-BY button or return to the step 1 by pressing the STOP button are inhibited.

1. Step 1 Mode
When the CD test mode is turned on, the following indication lights, the processing (until turning-off of CD STB terminal of CD
initialization operation flow) is executed, and the next button input is waited.

After lighting for one second

If the following operation buttons are pressed in this state, the operation is performed as follows.

"ON/STAND-BY" ...... The test mode is turned off, the power is turned off, and the ordinary stand-by mode is set.
"FF/FWD" ................. After the pickup returns once to the innermost periphery, it slides toward the outer periphery while this

button is held down.

"REW/REV" .............. After the pickup returns once to the innermost periphery, it slides toward the inner periphery while this

button is pressed. However, if PU-IN is on, input is invalid.

"PLAY" ..................... Shift to step 2
"STOP" ..................... Invalid
"REC PAUSE" .......... Shift to step 5

The test mode applied to this microcomputer has three modes, namely ordinary test mode to be used for adjustment or
measurement, aging test mode to be used for aging test, and self-diagnosis test mode for self-inspection in case of final product
inspection.

To turn on the specific test mode, press the ON/STAND-BY button, holding down the following two buttons in the ordinary stand-
by mode (power off state). In this case only the main unit button is valid. Even when the ON/STAND-BY of remote control button
is set to on, the test mode is not turned on.
[Ordinary test mode]
1. CD  Test Mode (TEST 1)…………………… BASS/TREBLE + FF/FWD
2. Tuner Test Mode (TEST 2)………………… BASS/TREBLE + REW/REV
3. Electronic volume Test Mode (TEST 3)…… BASS/TREBLE + REC
4. Timer Test Mode (TEST 4)………………… MEMORY/SET + REC
5. LCD Test Mode (TEST 5)……………………MEMORY/SET + REW/REV

MEMORY/SET + PLAY

[Self-diagnosis Test Mode]

1.  Button input diagnosis test mode (TEST6).…

• Setting the Test Mode
Keeping the REW/REV button and BASS/TREBLE button
pressed, turn on POWER. Then, the frequency is initially set
in the memory as shown in Table. Call it with the PRESET
button to use it for adjustment and check of tuner circuit.

1

87.50 MHz

2

108.00 MHz

3

98.00 MHz

4

90.00 MHz

5

106.00 MHz

11~25

––––

6

531 kHz

7

1,602 kHz

8

990 kHz

9

603 kHz

10

1,404 kHz

26

106.00 MHz

27

90.00 MHz

28

98.00 MHz

29

108.00 MHz

30

87.50 MHz

– 11 –

The time display indicates always "0:00".

When the following buttons are pressed in this state, the operation is executed as follows.
"ON/STAND-BY" ..... The test mode is turned off, the power is turned off, and the ordinary standby mode is set.
"FF/FWD" ................ The pickup slides toward the outer periphery while this button is held down.
"REW/REV" ............. The pickup slides toward the inner periphery while this button is held down. However, if PU-IN is on, input

is invalid.

"PLAY" ..................... Shift to step 5
"STOP" .................... Return to step 1
"REC PAUSE" ......... Shift to step 5

*If the focus is disturbed, the process returns to step 1.

The CLV servo ON command (8600) sending operation is performed, and the next button input is waited. (The disc is rotated
to perform CLV locking.)

When the following operation buttons are pressed in this state, the operation is executed as follows.
"ON/STAND-BY" ..... The test mode is turned off, the power is turned off, and the ordinary standby mode is set.
"FF/FWD" ................ The pickup slides toward the outer periphery while this button is held down.
"REW/REV" ............. The pickup slides toward the inner periphery while this button is held down. However, if PU-IN is on, input

is invalid.

"PLAY" ..................... If the focus has been set, shift to step 4 is executed. If the focus has not been set, acceptance is inhibited.
"STOP" .................... Return to step 1
"REC PAUSE" ......... Shift to step 5
*If the focus is disturbed after it has been set, the process returns to step 1.

The laser is kept lighting. The processing (until turning-on of CLV servo of CD initialization operation flow) is executed, and
the next button input is waited. (The focus servo is turned on, and focus search is performed.)
The focus search is repeated until the focus is set.

If the following buttons are pressed in this state, the operation is performed as follows.
"ON/STAND-BY" ..... The test mode is turned off, the power is turned off, and the ordinary stand-by mode is set.
"FF/FWD" ................ The pickup slides toward the outer periphery while this button is held down.
"REW/REV" ............. The pickup slides toward the inner periphery while this button is held down. However, if PU-IN is on, input

is invalid.

"PLAY" ..................... Shift to step 3
"STOP" .................... Return to step 1
"REC PAUSE" ......... Shift to step 5

2. Step 2 Mode
When the "PLAY" button is pressed in this mode, the laser lighting command LDON (8400) is sent, and the laser is turned on.
Other operations are not performed.

* In case of initialization the pickup is moved toward the inner periphery. Any buttons other than ON/STAND-BY button are not

accepted until the shift of pickup to the inner periphery is completed at this time. If PU-IN SW ON cannot be detected within
10 seconds, the slide motor is stopped, and the following error indication appears. Press the ON/STAND-BY button to end
the test mode, or press the STOP button to return to step 1. Any other operations are inhibited.