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– 35 –

1

2

3

REVIEW

0.5ms
1.00 V
IC1  41   HF

0.5ms
5.0 V
IC1  37  HFL

1

3

1

4

0.5ms
5.0 V
IC1  36   TES

1

5

CUE

50ms
10.0 V
IC1  33   JP+

50ms
10.0 V
IC1  32   JP-

1

6

1

7

50ms
0.50 V
IC1  14   JP

1

8

50ms
1.00 V
IC1   7   TE

1

9

0.5ms
10.0 V
IC1  33   JP+
0.5ms
10.0 V
IC1  32   JP-

1

6

1

7

0.5ms
0.50 V
IC1  14   JP

1

8

0.5ms
1.00 V
IC1   7   TE

1

9

REVIEW

50ms
10.0 V
IC1  33   JP+
50ms
10.0 V
IC1  32   JP-

1

6

1

7

50ms
0.50 V
IC1  14   JP

1

8

50ms
1.00 V
IC1   7   TE

1

9

0.5ms
10.0 V
IC1  33   JP+

0.5ms
10.0 V
IC1  32   JP-

1

6

1

7

0.5ms
0.50 V
IC1  14   JP

1

8

0.5ms
1.00 V
IC1   7   TE

1

9

PLAY

NORMAL DISC
TN0=01

20ms
1.00 V
IC1  27   SPO

20ms
2.00 V
IC2  12  CLV+

1

10

1

11

PLAY TCD-712 (140mm)

TN0=01

50ms
1.00 V
IC1  27   SPO

50ms
2.00 V
IC2  12  CLV+

1

10

1

11

PLAY

TCD-712

1

5s
100mV
IC1  29   SLD

1

12

1

0.5s
100mV
IC1  29   SLD

1

12

3

5ms
0.50 V
IC1  20   FE

1

5ms
5.0 V
IC1  54  DRF

STOP

PLAY

FOCUS

SERCH

1

1

1

2

1

2

3

CUE

0.5ms
1.00 V
IC1  41   HF

0.5ms
5.0 V
IC1  37   HFL

1

3

1

4

0.5ms
5.0 V
IC1  36   TES

1

5

– 36 –

•  When the turntable fails to stop.

Is from

  5 V till 2.5V down pulse (approx. 300 ms)

Check the SW2 and the wiring from the IC701 pin 42 to the

SW2.

No

input into the IC701 pin 42 when the turntable is rotating?

5V

2.5V

Yes

Check IC2 pin26 Q51 and the periphery.

Check the MECHA UP switch and the wiring from the IC701
pin 42 to the MECHA UP switch.

No

Is there following voltage input on the IC701 pin 42 in the
specific state?
When the CD mechanism is moved up: 0V

In other states: 4.3V

Yes

IC701 defective.

When the CD section does not operate when the objective lens of the optical pickup is dirty, this section may not operate. Clean
the objective lens, and check the playback operation. When this section does not operate even after the above step is taken, check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC (Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup
lens. Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."

Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.

Dust gradually accumulates on the objective lens during use, and it may degrade performance.  To avoid this problem, use a
cleaning disc designed for CD optical pickup lenses.

0V

HOW TO USE
1. Using the brush in the cleaner cap, apply 1 or 2 drops of the cleaning fluid to the brush on the CD cleaner disc which has

the 

 mark next to it.

2. Place the CD cleaner disc onto the CD disc tray with the brush side down, then press the play button.
3. You will hear music for about 20 seconds and the CD player will automatically stop.  If it continues to turn, press the stop
button.
CAUTION

 The CD lens cleaner should be effective for 30~50 operations, however if the brushes become worn out earller then please

replace the cleaner disc.

 If the CD cleaner brushes become very wet then wipe off any excess fluid with a soft cloth.

 Do not drink the cleaner fluid or allow it to come in contact with the eyes.  In the event of this happening then drink and /

or rinse with clean water and seek medical advice.

 The CD cleaner disc must not be used on car CD players or on computer CD ROM drives.

 All rights reserved.  Unauthorized duplicating, broadcasting and renting this product is prohibited by law.

Cleaner Liquid

Cleaning Disc
PARTS CODE: UDSKA0004AFZZ

Yes

– 37 –

Is there following voltage input in specific state of IC701 pin 37?

     Open state: 0V

     Close state: 0V
  Intermediate state between open state and close state: 4.3V

Is H output to IC2 pin 24 or 25 for 7 seconds when the OPEN/
CLOSE button is pressed? IC3 is defective. Replace it.

Is 4V output between IC3 pins 38 and 39 during operation
stated above?

Check the loading motor (M3) and the loading mechanism.

Yes

Yes

Yes

No

No

IC2 defective.

No

Check the periphery of IC3.

IC3 defective.

OK

OK

Check the OPEN/CLOSE switch and the wiring from the
IC701 pin 37 to the OPEN/CLOSE switch.

Check the wiring of the IC2 pins 24 and 25, IC3 pins 38 and 39.

The CD operating buttons don't work.

Check the CD, DSP, power supply, and 16.93 MHz clock, and
reset terminal.

Check the waveform of SCK, SO (DATA) and SI (COMM).

Yes

Yes

See if the pick-up is in the PICKUP IN switch position.

If the items mentioned above are OK, check the main
microcomputer IC701.

Yes

Yes

No

Is there following voltage input on the IC701 pin 42 in the
specific state?

In other states: 4.3V

When the CD mechanism is moved up: 0V

Check the MECHA UP switch and the wiring from the IC701
pin 42 to the MECHA UP switch.

Is 4V output from the Q51 emitter during operation stated
above?

Yes

Yes

Check the wiring of IC2 pin 27 and Q51 pin 2.

OK

No

No

Is L output from the IC2 pin 27 during SEC when the disc skip
switch is pressed?

Yes

Check turntable motor and turntable mechanism.

Check Q51 and the periphery.

IC2 defective.

– 38 –

Is HF waveform normal (see the Fig. 38-2, Fig. 38-3)?

Check the tracking system.

Is the Focus servo active? (Can you hear it working?)

Check the laser diode driver.
Check the area around IC1(16) - (21) (focus servo circuit).

No

Yes

Yes

Yes

Does the DRF signal change from "L" to "H"?

No

Yes

If the disc is not turning, the DRF
should not change to "H".

Level is abnormal.

No

Yes

Waveform is unstable.

Check the spin system.

Yes

Check the periphery
of IC1 pins 41 and 42.

Check the spin system.

3

2
1

4

0.5s
1.00 V
IC1  16  FD

0.5s
10.0 V
IC2  12  CLV+

0.5s
10.0 V
IC1  54  DRF

0.5s
2.00 V
IC1   7   TE

Waveform in
case of normal
playback

No

Yes

No

Check the Focus - HF system.

Playback can be performed without a disc.

Focus search OK

Does the pick-up move up and down twice?

Does the output waveform of IC1(16)(FD) match that shown in
Fig. 38-1?

Check the IC1(50)(CLK) line, 4MHz.
Check the microcomputer data on pins (51)(CL), (52)(DAT)
and (53)CE.

Check the area around IC3-CNP2.

Yes

Yes

0.5s
0.50 V
IC1  16  FD

2

1

0.5s
0.50 V
IC1   7  TE

Focus search is 
performed two 
times when play 
operation is done 
without disc.

∝

HF
1.0V/DIV
0.5 sec/DIV(DC)
(When playing
 back the disc)