Page 1
TROUBLE SHOOTING GUIDE (CDP)
Turn power on.
Is power on?
YES
Does initial read work?
YES
Does it play?
NO
NO
NO
Check power supply circuit.
Check laser circuit.
Check focus circuit.
Check disc.
Check tracking servo circuit.
YES
NO
Does it output audio? Check audio circuit
YES
OK
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Page 2
A
B
Fails to initial read
1.3V
Disc motor turns. Does laser light?
YES
YES
Does RF
waveform
appear?
(IC801 74 pin)
Is rotation normal?
Does tracking
NO NO NO NO
servo work?
Lower envelope
of IC801 74
pin(RF)
waveform is flat.
Does signal
appear at IC801
50 pin (TEO)
Does TE1 signal
appear at pin 54
of IC 801?
YESYES
YES
Does signal appear at IC 803
Pin 26 and Pin 27 ?
YES
NO
Does GFS (IC 802 pin 25
show as below?
NO
NO
Defective pattern.
Defective IC 801
and/or IC 803
Defective pick-up
and/or connector.
Defective IC 801.
Defective IC
801, pick up
and/or short
wire.
YES
Is there no dropout of RF
signal?
YES
- 3 -
NO
Scratch in disc
initial read area.
Defective pick-up
adjustment focus
offset or pick-up.
Page 3
A
Laser does not light.
Is “H” applied to pin 38 of IC 801?
YES
NO
Did pickup return to
innermost circular?
YES
Does it stop at inner pick
circular after shift?
YES
Is data transferred from
IC 101?
YES
Does voltage appear at
IC 803 pin 11 , 12 ?
YES
Is defect output and input
to pin 2 of IC802?
OPEN CLOSE
NONO
NO
NO
Defective -COM.
Defective IC 801, 802.
Defective slide motor
and/or connector.
Defective LMT SW
and/or connector.
YES
Is power supplied to laser Q801?
(Q801 collector: about 1.8V)
YES
Does laser current flow?
1.0V across R801.
YES
NO
R801 1.0V
R801 1.0V
- 4 -
YES
YES
Defective MICOM.
Defective connector.
Defective Q801 and/or
laser.
Defective laser and/or
connector.
Page 4
C
B
Laser lights.
Confirm
initial
read
with
disc
Does lens move up/down?
YES
Does IC801 pin 74 (RF) signal
appear even in low level?
YES
NO NO
Does IC 801 out focus
search signal?
IC 801 pin 48 (FEO)
YES
Os focus search signal
applied to pin 1 , 2 of
IC803?
YES
NO
NO
Defective IC 802.
Defective IC 803.
Open activator and/or
connector.
Open connector and/or
defective IC 801.
Is laser output adjustment correct?
YES
Does FOK(focus ok) signal appear?
IC801pin 74
(HF)
IC801 pin 40
(FOK)
YES
NO
NO
Incorrect turntable
height. Degraded laser
diode.
Defective IC 801.
- 5 -
Page 5
C
YES
Does FE1 signal appear? IC 801 59 pin
YES
Does FZC signal (focus zero cross signal)
appear at pin 31 of IC 801, ISTA(SENSE)
terminal?
FER
SENSE
YES
Does SMON signal appear
at pin 73 of IC 802?
Does SMDP signal appear
at pin 75 of IC 802?
NO
NO
NO
Defective IC 801.
Open pick diode.
(Focus servo turns
Defective IC 801.
Defective pattern between IC 802 pin
27 , 36 , 37 , 38 and IC 101.
ON by FZC signal
of FOK mod.)
YES
Is drive voltage applied to disk motor?
Start mode
YES
NO
Defective IC 801, 803 and/or
peripheral circuit.
Defective disk motor and/or
insulation.
- 6 -
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