Fault Finding Guide - Grundig CDP75 Bedienungsanleitung

CDP 75 / CDP 110

Fault Finding Guide

CHECK
CHECK
CD-DRIVE AND
FOCUS PATH
SERVO CIRCUITS
enter
service program
turntable and
"FOCUS TEST"
disc free ?
N
focus found ?
lens
movement ?
check/repair
FOCUS PATH
Y
CHECK
LIGHTPATH
enter
service program
"DISC MOT. TEST"
N
disc speed OK ?
check/repair
TURNTABLE
Y
MOTOR PATH
enter
service program
"RADIAL TEST"
N
radial tracking
OK ?
check/repair
RADIAL
CHECK
Y
TRACKING
LIGHTPATH
enter
service program laser light ?
"PLAYBACK TEST"
errors during Y
voltage on
playback ?
MP12=1.2V
FUNCTIONAL
TEST
N
voltage on
pin4 of 1800
CD-DRIVE AND
=1.2V ?
SERVO CIRCUITS
OK
photodiodes
OK ?
replace
HF-amplifier 7800
GRUNDIG Service
Allgemeiner Teil / General Section
N
replace
Y
CD-drive
N
Y
triangle
N
voltage on
focus actuator
OK ?
Y
triangle
connections
N
voltage on
to/from CD-drive
p.41 of 7950
OK ?
OK ?
Y
replace repair check
CD-drive connections servo driver 7950
N
Y
N
Vddl=2.5V ?
N
?
Y
replace
Y
CD-drive
N
LDon=H ?
N
check
Y
DSIC2 7801
check
Y
3800
voltage on
N
pin16 of 7800
=1.8-2.0V?
N
Y
comp. around
replace 7901 OK ?
Y
CD-drive
Y
replace replace
CD-drive CD-drive
CDP 75 / CDP 110
CHECK
TURNTABLE
MOTOR PATH
discmotor
turning ?
Y
turntable and
disc free ?
Y
focus OK ?
Y
N
eye-pattern
OK ?
Y
check
Y
DSIC2 7801
discmotor
control OK ?
Y
replace
CD-drive
problem
solved ?
Y
TURNTABLE
MOTOR PATH
OK
comp. of
N
laser power contr.
OK ?
Y
check repair
servo driver 7950 laser power control
N
repair
1 - 19 GRUNDIG Service
N
N
mechanical N
obstruction ?
N
Y
remove replace
CHECK
obstruction CD-drive
FOCUS PATH
N
CHECK
LIGHTPATH
N
repair
discmotor control
N
replace CD-drive
by old one
check
CD6 7830
Allgemeiner Teil / General Section
connections
N
to/from CD-drive
OK ?
Y
repair
connections
N
discmotor
control OK ?
Y
check repair
CD6 7830 discmotor control
1 - 20