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ROM/RAM Operation
Can ROM
NO
disc be inserted
correctly?
YES
NO
Is disc turning?
YES
of IC3 pin 21 alternate
above and below VREF
output between IC2
pins 17 and 18?
Faulty spindle motor
Does optical
NO
pickup move up
and down?
YES
3
(Continued on next page.)
H = 3.3V
L = 0V
IC10
? LOAD OPEN SW0 (S3)
A LOAD PLAY/REC SW2 (S5)
B LOAD PLAY SW3 (S6)
= DISC-IN
IC3 pin 21
Voltage alternates above
and below VREF (1.3 V).
Does output
NO
(1.3 V)?
YES
Faulty IC3
Is voltage
NO
YES
Faulty IC2
D i s c t r a y
pin 18 change from
STOP/PLAY
REC
O P E N
L
H
H
"H" to "L" when disc
H
H
L
H
L
H
H
L
L
IC10 pins 13, 15, 17,
of IC10 pins 8
output from IC92
pins 2 and 4?
Faulty loading motor
of IC3 pin 18 alternate
above and below
VREF (1.3 V)?
output between IC2
pins 13 and 14?
Faulty optical pickup
5
Does CN4
NO
is inserted?
YES
Faulty loading
TRG S7
Is output of
NO
and 18 OK?
YES
Faulty S3, S4,
S5, and S6
Is voltage
NO
and 9 OK?
YES
Faulty IC10
Is voltage
NO
YES
Faulty IC92
IC3 pin 18
Voltage alternates above
and below VREF (1.3 V).
Does output
NO
YES
Faulty IC3
Is voltage
NO
YES
Faulty IC2
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