Page 1
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TROUBLESHOOTING GUIDE
CD PART
Is the function selector in the CD position?
Is power turned ON?
Does initial reading occur?
Can disc be played?
Is audio output supplied?
OK
END
¥ Check power supply circuitry.
¥ Check laser circuitry.
¥ Check focusing circuitry.
¥ Check disc.
¥ Check tracking servo circuitry.
¥ Check Audio circuitry.
YES
YES
YES
YES
YES
NO
NO
NO
NO
Page 2
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1-1.8V
2.5V
1. If initial reading is not carried out (with disc)
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO NO
NO NO
NO
NO
NO
NO
NO
NO
Is IC601 pin 22 output
waveform normal?
Door open
(3.2V~5V)
Door close(1.9V~2.5V)
Does laser light?
¥ Leaf SW contact defective.
¥ Connector defective.
¥ Pattern short.
Does disc motor rotate?
Is HF
waveform
output?
IC501 pin 74
Is tracking servo
operating?
Is the lower
envelope of HF
(RF) waveform
flat?
Is signal output
at IC501 pin
50?
Is signal output at tracking
output IC502 pin 26, 27?
Does IC503 pin 25 (LKFS) as
figure?
Is retation normal?
Is there any irregularity in
frequency?
Is HF signal normal without
dropout?
Is TER signal
output, at
IC501 pin
54?
¥ IC501
defective.
¥ Connector
defective.
¥ Pick up
defective.
¥ Pattern
defective.
¥ IC502 or pattern
defective.
¥ Pick up
defective.
¥ Connector
defective.
¥ IC501 or IC503
defective.
¥ PLL CIRCUIT
defective.
¥ Disc initial reading
damaged or
defective.
¥ CLV
SERVO(R530,
C535, C536, R531)
circuit defective.
Page 3
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A
NO
NO
NO
NO
NO
NO
NO
NO
NO
When laser does not light
Is below signal ÒHÓ at IC501 pin
38 (RESET)?
Has Laser Power source returned to
the Q501?
(Q501 Collector Voltage about 1.8V)
Does generate about 3.3V at IC501
pin 70 (LD)?
Flow Laser Current?
Both voltage of 507 is about 1.0V?
Are data transferred from
IC601?
IC601 pin 93 : XLT
pin 94 : XRST
pin 98 : DATA
pin
100
: CLK
Is below signal output at
IC502 pin 17, 18?
¥ IC601 defective.
¥ IC501 defective.
¥
Surrounding Circuitry defective.
¥ Connector defective.
¥ Pick-up defective.
¥ IC501, 502 defective.
¥ Slide motor defective.
¥ Connector defective.
¥ IC505 defective.
¥ LMT SW defective.
¥ Connector defective.
¥ IC502 defective.
¥
Q501 defective, connector defective.
¥ Laser defective.
¥ Laser defective.
¥
Connector defective. short etc.
Has Pick-up returned to the
innermost position?
Does pick-up stop after
having moved to the
innermost position?
Are detect output input at
IC601 pin 22?
R507 1.0V
R507 1.0V
YES
YES
YES
YES
(2.5V)
OPEN
CLOSE
(1.95V)
YES
YES
YES
YES
YES
YES
[
Page 4
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B
C
Amplitude 0.5~1.5v
IC501 Pin
74
HF
FOK
IC501 Pin
40
Do lenses move up and down?
Is signal output at focus
search terminal?
IC 501 pin 48 (FEO)
Is signal output at IC502
pin 1 , 2 ?
When laser light
¥ IC501 defective.
¥ C527 defective.
¥ IC 502 defective.
¥ IC501 defective.
¥ Pattern defective.
¥ Actuator short.
¥ Connector short.
¥ Connector short.
¥ IC501 defective.
¥ Pick-up defective.
¥ Turntable height error
¥ Laser diode degraded.
Is IC501 pin 74 (HF) signal waveform
output?
The waveform of IC501 pin 74 (HF) is
below figure?
Is Fok signal intput to IC601 pin 99 ?
Is Fok signal output?
(HF and REF) 0.4 over OK.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Page 5
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FER
SENSE
(ISTAT)
C
at Start
Is FER signal output? IC501 Pin 59?
Is FZC signal output at IC501 Pin 31
(SENS)?
Is Mon signal output by
IC503 Pin 73?
Is MDP signal output by
IC503 Pin 75?
Has voltage at disc motor?
(IC502 pin 11, 12 )
¥ IC501 defective.
¥ Pick up defective.
¥ Connector defective.
¥ IC501 defective.
¥ Pattern defective between.
¥ IC503 Pin 27,36,37,38 and IC601.
¥ IC501, 502 defective.
¥ Surrounding circuity defective.
¥ Disc Motor defective.
¥ Connector defective.
When Fok focus
Servo Conform by
FZC signal
NO
NO
NO
NO
YES
YES
YES
YES
YES
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