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– 49 –

NOTES ON SCHEMATIC DIAGRAM can be found on page 20.

RH99
10

CH34
0.001

CH99
0.001

CH32
0.022

CH33
0.001

CH98
0.001

CH30
0.022

CH19
0.022

CH20
0.022

RH32
5.6

RH31
5.6

RH29
3.9

CH28
0.022

CH26
0.022

RH30
3.9

LH02

0.29

µ

H

LH01

0.29

µ

H

CH29
0.022

CH25
0.022

CH31
0.022

CH27
0.022

+B

–B

CENTER

SPEAKER

SURROUND SPEAKER

6 OHMS

R-CH

L-CH

12 OHMS

NC

NC

C-CH

S-CH

1

9

9

1

+B

NC

NC

GND(A)

GND

PROT

RELAY

STAND-BY

GND(M)

+12V(M)

+B

Fusible

ICH01

STK40705

POWER AMP.

–B

–B

-B

+B

–B

GND1

+B

GND2

GND(SP C-CH)

GND(SP S-CH)

SP LEVEL

+B

AMP.PWB-L

FROM
POWER AMP.
PWB

TO MAIN PWB

CFW853A

P31 12-C

CNS905

P44 5-E

ICH01

(2/2)

CH07
2.2/50

SOH01
CENTER
/SURROUND SPEAKER
TERMINALS

FW853A

CFW853B

CNP905

RH28

4.7

CH24

0.1

(ML)

CH22

0.1

(ML)

RH27

4.7

CH23

0.1

(ML)

CH21

0.1

(ML)

RH11

56K

RH15

1K

CH36
47/50

RH14

330

RH12

56K

RH16

1K

RH25

56K

RH26

56K

RH98

56K

CH97
47/50

QH98

KTC3199 GR

QH97

KTC3199 GR

DH98
1SS133

FH01

T4A L 250V

FH02

T4A L 250V

RH13

330

CH35
47/50

CH37
0.001

RH07

56K

CH09

470P

RH08

56K

CH10

470P

RH09

1K

RH84

100

Fusible

100/50

CH89

47/50

CH87

RH83 100

CH90

100/50

RH85

22K

CH88
47/50

RH40

1K

RH39

1K

RH22

0.2 (1W)

RH24

0.2

(1W)

RH23

0.2 (1W)

RH21

0.2 (1W)

CH18

0.022

CH17

0.022

RH19

10K

QH03
KTC3199 GR

RH20

10K

QH04

KTC3199 GR

DH02

1SS133

DH01

1SS133

ICH01

(1/2)

RH10

1K

DH95

1SS133

DH96

1SS133

RH72

22K

RH71

22K

DH97

1SS133

DH99

1SS133

RLH01

RELAY

QH99

KTC3199GR

RH96

47K

RH97

3.3K

RH73

3.9K

CH14

15P

CH13

15P

CH12

47P

CH11

47P

CH08

2.2/50

9

8

7

6

5

4

3

2

1

1

7

9

3

8

5

4

2

6

1

2

3

4

5

6

7

0V

0.14V

0.8V

3.9V

0V

0V

0V

0V

3.9V

0V

0V

3.9V

3.9V

0V

0V

0V

-34V

-33V

12

11

10

32V

0V

0V

0V

-34V

34V

33V

0V

15

0V

0V

13

14

ICH01

STK40705

POWER AMP.

– 50 –

50ms
10.0 V
  JP+

CUE

50ms
10.0 V
  JP-

50ms
0.50 V
  JP

50ms
1.00 V
  TE

6

7

8

9

 0.5ms
10.0 V
  JP+

 0.5ms
10.0 V
  JP-

 0.5ms
0.50 V
  JP

 0.5ms
1.00 V
  TE

6

7

8

9

REVIEW

50ms
10.0 V
  JP+

50ms
10.0 V
  JP-

50ms
0.50 V
  JP

50ms
1.00 V
  TE

6

7

8

9

 0.5ms
10.0 V
  JP+

 0.5ms
10.0 V
  JP-

 0.5ms
0.50 V
  JP

 0.5ms
1.00 V
  TE

6

7

8

9

3

5ms
0.50 V

1

5ms
5.0 V

STOP

PLAY

FOCUS

SERCH

2

1

 FE

DRF

PLAY

20ms
1.00 V
  SPO

NORMAL DISC
TN0=01

20ms
2.00 V
CLV+

10

11

PLAY

TCD-712 (140mm)
TN0=01

50ms
1.00 V
  SPO

50ms
2.00 V
CLV+

10

11

PLAY

TCD-712

5ms
100mV
  SLD

1

12

0.5ms
100mV
  SLD

1

12

0.5ms
1.00 V

0.5ms
5.0 V
 HFL

0.5ms
5.0 V
 TES

1

2

3

CUE

3

4

5

HF

0.5ms
1.00 V

1

2

3

0.5ms
5.0 V
HFL

0.5ms
5.0 V
TES

REVIEW

3

4

5

HF

– 51 –

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.

Check the changer mechanism cam switch (SWB101 to
SWB104) and tray switch (SWB105 to SWB108).

Yes

Yes

Check the connection between IC201 and SW.

No

Check whether output of pins 3 and 7 of main cam motor
driver IC81 is normal.

Check the connection from IC2 to IC81.

No

Yes

Check whether the output of pins 3 and 7 of tray motor
driver IC82 is normal.

Yes

Check the motors MOB1 and MOB2.

No

Check the connection from IC2 to IC82.

Check whether state changes to Low when
IC201 pin 95 cam SW1
      pin 96 cam SW2
      pin 97 cam SW3

      pin 98 cam SW4

  is on.

Check whether state changes to Low when
IC201 pin 33 tray SWA
      pin 100 tray SWB
      pin 1 tray SWC
      pin 2 tray SWB

  is on.

Yes

Yes

Check the waveform of SCK, SO (DATA) and SI (COMM).
Check the waveform of IC2 pin 54 (SQOUT), pin 55 (COIN),
and pin 56 (CQCK).

Check the CD, DSP, power supply, and 16.93 MHz clock
and reset terminal IC2 pin 57.

Yes

Yes

If the items mentioned above are OK, check the main
microcomputer IC201.

Check that the pickup is in the PICKUP IN switch position
of SW702A.

The CD operating keys don't work

– 52 –

Is HF waveform normal  (see the Figure 52-2, Figure52-3.)?

Check the tracking system.

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

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

No

Yes

Yes

Yes

Does the DRF signal of IC1 pin 54 change from "L" to "H"?

No

Yes

Check the spindle system.

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

No

Yes

Check the periphery of
IC1 pin 41 and pin 42.

Level is abnormal

Yes

Check the spindle system.

Waveform is unstable.

Check the FOCUS-HF system.

Playback can be performed without  a disc.

Does the pickup move up and down two twice?

Yes

No

Focus search OK

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

Yes

Does the output waveform of IC1 pin 16 (FD) match that
shown in Figure 52-1?

Yes

No

Check the area around IC3 to CNP2.

HF
1.0V/DIV
0.5

µ

sec/DIV(DC)

(When playing
 back the disc)

 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.

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 play-back