2-6
CS 46 437
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 ?
voltage on
pin 16 of 7800
=1.8-2.0V ?
Y
check
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
3.5
comp. around
7901 OK ?
N
Y
repair
replace
HF-amplifier 7800
pin 8 of 7800
=2.5V ?
pin 7 of 7800
=high ?
FAULT FINDING GUIDE LIGHTPATH