GRUNDIG Service
3 - 11
k
GV 900…, GV 940…
Troubleshooting
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Troubleshooting Diagram 7 – Capstan Motor
Capstan Motor does not run.
>2.6V at IC701-(59)?
IC701?
NO
2.5V at IC701-(69)?
C728, C729, IC701?
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
5V at plug contact AC-(8)?
Power supply PC 5V?
>2.6V at plug contact AC-(4)?
Signal path between IC701-(59) and
plug contact AC-(4)?
1.6…2.7V at plug contact AC-(3)?
Signal path between IC701-(60)
and plug contact AC-(3), IC701?
12V or 20V at
plug contact AC-(5)?
YES
Capstan motor?
Power supply M12V/20V
(Q9903, Q9904, Q9909, Q9910)?
Troubleshooting Diagram 8 – Headwheel Motor 1
Headwheel Motor does not run.
>2.6V at IC701-(58)?
IC701?
NO
NO
NO
>2.5V at IC701-(69)?
C728, C729, IC701?
NO
YES
YES
YES
Power supply STBY5V?
Signal path between
IC701-(9) and IC702-(2)?
IC702, signal path between
IC702 and connector AD, flexprint
lead, headwheel motor?
5V at IC702-(2, 25)?
>2.6V at IC702-(29)?
Signal path between IC701-(58)
and IC702-(29), IC701?
NO
YES
YES
12V at IC702-(20)?
Power supply M 12V?
Troubleshooting Diagram 9 – Headwheel Motor 2
Headwheel Motor runs only
for a few seconds.
IC702?
Peripheral circuit of IC702-(4…7)?
PG signal at IC702-(8)?
PG signal at IC701-(66)?
Signal path between IC702-(8)
and IC701-(66)?
Head switching pulse at IC701-(23)?
IC701?
NO
Headwheel motor?
YES
YES
YES
NO
NO
FG signal
ca. 5Vpp
PG signal
ca. 5Vpp
YES
NO
YES
YES
NO
NO
Troubleshooting Diagram 10 – Head Switching Pulse
No Head Switching Pulse
V-H.SW.P at IC701-(23).
See Troubleshooting Diagrams 8, 9
– Headwheel Motor 1, 2
Is the headwheel rotating?
PG and FG signals at
IC701-(66, 65)?
IC701?
Signal path between IC702 and
IC701?
IC702?
PG and FG signals at
IC702-(8, 9)?
S. / P.
IC201
4-26
IC202
4-26
IC651
4-25
IC701
4-22
IC702
4-21
IC703
4-22
IC704
4-22
IC705
4-22
IC801
4-21
IC901
4-28
IC902
4-28
IC1601
4-33
IC1602
4-29
IC1701
4-36
IC1801
4-22
IC1901
4-35
IC1951
4-35
IC2501
4-24
IC5301
4-31
IC6301
4-24
RMC801 4-21
Tuner
4-30
