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3
Is TOC read
NO
and disc data
displayed?
YES
IC1 pin 29
(TP148 or IC3 pin 87)
3.3V
0V
2ms. 1V/DIV.
Does IC10
pin 13 change from
"H" to "L"?
YES
Faulty IC10
4
(Continued on next page.)
Is there
output from IC1
NO
pins 11 (TP55) and
16 (TP57)? *1
YES
Can
waveform of IC1
NO
pin 11 be adjusted so that
it is approx. symmetrical
with a level of
*1
0.1 Vp-p?
YES
Is RF
NO
waveform output from
IC1 pin 32 (TP52)?
*1
YES
Is there
output from IC1
NO
pin 29 (TP148 or
IC3 pin 87)?
*1
YES
NO
Is RF signal stable?
YES
Are
communications
NO
between IC3 and
IC72 OK?
YES
Communications error
NO
Faulty S4
IC1 pin 11
IC1 pin 16
0.1V
50mV
P-P
P-P
2ms. 50mV/DIV.
2ms. 50mV/DIV.
*1:
For measurements of IC1, refer to the
item 8.5.2. of "Operation Checks and
Component Replacement Procedures".
Faulty IC1 or
optical pickup
Is voltage
output from IC1
pins 38 (TP44) and
39 (TP37)?
*1
YES
Faulty IC1
Is voltage
output from IC3
pin 96?
YES
Faulty IC1
Faulty IC72
NO
Faulty optical pickup
NO
Faulty IC3
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