2-6
CS 46 168
laser light ?
N
N
Y
voltage betw.
pin 2/3 of 1800
=1.2V ?
Y
CHECK
LIGHTPATH
replace
CD-drive
N
voltage on
pin 4 of 1800
=1.2V ?
Y
check
1.2,
2800/3800
N
Y
replace
CD-drive
N
photodiodes
OK ?
Y
replace
CD-drive
replace
CD-drive
N
Y
N
Y
check
CD7 7830
check
CD7 7800, 7520
3975, 3905
OK ?
N
Y
repair
repair
N
check
HF-preamplifier
7880
3.5
OK ?
pin 64 of 7830
=high ?
emitter of 7901
≈
2V ?
Y
pin 1 of 7800
=high ?
FAULT FINDING GUIDE LIGHTPATH
