Grundig GV 900 SV/1 Manuel De Service page 96

Mechanical Troubleshooting
1. FF/REW or PB Failure
Press Ï, Ì or Å button.
No
Is master cam acc. to the Does loading
operating mode in fast motor operate?
forward or playback position ?
Yes
Modes changing smoothly
through master cam?
Check loading motor control
No
Does capstan motor turn Are Vco 12V and
acc. to the operating mode?
Vcc 5V applied?
Yes
Check the capstan motor.
No
Check the idler ass'y.
Does idler wheel turn?
Yes
Are tacho pulses fed out from No
Check the reel sensors.
reel sensors?
Yes
Check cassette or check signal
path in Playback/Record mode.
2. Failure of video search reverse mode
No
Go to 1. FF/REW or PB
Is Playback function normal?
FAILURE routine.
Yes
Press Ï button.
No
Go to 1. FF/REW or PB
Master cam shifting to video
FAILURE routine.
search reverse position?
Yes
No
Does idler wheel turn? Check idler gear ass'y.
Yes
No
Is supply reel winding
Check limiter pulley ass'y.
torque correct?
Yes
No
Are tacho pulses fed out
Check reel sensors.
from reel sensors?
Yes
Check playback signal path.
englisch • English • anglais
Check voltage supply.
No
No
Is voltage applied
to loading motor?
Yes Yes
No
Check the loading motor.
Yes
Check master cam position or
master cam sensors.
system.
No
Check voltage supply.
Yes
3. Unusual noise in cassette insertion and ejection mode
Unusual noise in cassette
insertion and ejection mode.
Is unusal noise heard when
Yes
the cassette compartment Check cassette control ass'y.
is moved?
No
Is unusual noise heard with Check pinch roller drive cam,
Yes
pinch roller lever going pinch roller drive lever and reverse
up or down?
No
Is unusual noise heard during
the threading and
loading function?
Check loading motor.
4. Unusual noise in FF/REW mode
Is reel height as No
Adjust reel height.
specified?
Yes
Is noise heard when turning Check the reel gearwheels
No
the reel by hand? and main chassis board.
Yes
Yes
Does the drive mechanism Rearrange the parts on
the main chassis board.
touch any part on the chassis?
No
Yes
Is noise heard when turning
Check capstan motor.
the capstan motor by hand?
No
Check the following parts of
the drive mechanism:
• Reel
• Limiter pulley ass'y
• Idler wheel ass'y
• Gears of drive mechanism
guide.