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TROUBLE SHOOTING FLOW CHARTS
Check AC power cord
Load a disc { not scratched or soiled ) and close the lid
NO
PLAY key "ON"
ls 1C301 pin 3 output voltage normal? ( +5V )
Check +V IN DC POWER supply circuit
NO
NO
F
i n S609
(CLOSE
switch) or $601 (POWER
Does LCD display?
Is 10501 pin 35 "LOW?
aulty contact in
S609
switch)
or
S601 (
switch)
YES
Disc starts rotatin
ne
|
# DC POWER BLOCK +5,2V?
aad
Check POWER
ON/OFF voltage
:
SougtP
ache
Check 1C501 pin 28 (P-CONTL)
YES
YES
NO
j
*Check operation of sled motor in the service mode
Check soldering of 1C401 pins 1 to 4
NO
YES
itted?
YES
Focus search takes place and focus servo goes "ON"
*Check focus search operation in the service mode
iB psi
(Do not look at laser beam for along
YES
Is FOK (1C501 pin 21) "HIGH'?
Check soldering of |C501 pin 21
Player stops after several seconds
Spindle motor runs away
Sled motor runs away
Readjust focus offset in the service mode
NO
NO
1s sound heard when 1st tune is played?
Does tracking servo go "ON" and appear RF waves?
Readjust tracking balance in the service mode
YES
Check soldering of 1C401, 402, and 701
Is PLL VCO waveform normal? (Ils GFS "'HIGH'?)
Readjust PLL VCO
2 (eo)
YES
Check bus line of 1C401 and 501 sub code.
Check soldering of |C401
NO
NO
Is skip search operation normal?
Is focus tracking gain normal?
Readjust each gain
YES
End of operation check
Check mechanism
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