Bell & Howell - Projector - Filmosound 641 - 642 ... - Cine Information
Bell & Howell - Projector - Filmosound 641 - 642 ... - Cine Information
Bell & Howell - Projector - Filmosound 641 - 642 ... - Cine Information
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FAULT FINDING GUIDE (Cont'd)<br />
TROUBLE PROBABLE CAUSE REMEDY<br />
c. Valves and exciter<br />
light, but no sound<br />
Speaker jack disconnected<br />
Speaker jack switch open<br />
Photo-diode cable<br />
disconnected<br />
Photo-diode cable leads<br />
reversed<br />
Damaged valves<br />
Photo-diode out of line<br />
Dirt on end of light pipe<br />
Wrong exciter lamp used<br />
d. Low volume Damaged valves<br />
e. Distortion at all<br />
volume levels<br />
Wrong exciter lamp used<br />
Photo-diode out of line<br />
Dirt on light pipe or slit<br />
Slit misaligned<br />
Buzz track misaligned<br />
Wrong exciter lamp used<br />
Output valves damaged<br />
f. Crackling noises Damaged valves<br />
Sound drum earthing spring<br />
loose, bent or lost<br />
Buzz track out of line<br />
g. Wow or flutter Guide roller sticking<br />
Guide roller spring broken,<br />
unhooked or lost<br />
Film edge guide (sound head)<br />
out of line<br />
Loose flywheel<br />
Damaged sound drum bearing<br />
Soundhead assembly wrongly<br />
positioned<br />
Dirt causing guide roller<br />
arm pivot bearing to bind<br />
10<br />
Connect leads<br />
Repair or replace jack<br />
Connect cable<br />
Connect to proper<br />
terminals<br />
Replace<br />
Realign (para. 49b)<br />
Clean<br />
Replace with correct lamp<br />
Replace<br />
Replace with correct lamp<br />
Realign (para. 49b)<br />
Clean<br />
Realign (para. 49d)<br />
Realign (para. 49e)<br />
Replace with correct lamp<br />
Replace<br />
Replace<br />
Repair or replace<br />
Realign (para. 49e)<br />
Clean<br />
Repair or replace<br />
Realign (para. 49e)<br />
Tighten<br />
Replace<br />
Realign<br />
Clean and polish