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Mend Bell & Howell 642 Film Projectors

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repairing bell and howell 642?

the projector stopped working the only thing that is working is the projector lamp
found fuse behind switch controls but that was ok
no power to amplifier or exciter lamp

dwhump1@yahoo.co.uk
January 2009
Bell & HowellBell & Howell 642Video, Film ProjectorsProjector Repair Bell & Howell
I had the same problem with my own bell & Howell 642.
In my projector a 5W 1000ohm resistor in the amplifier had broken.
Try first to adjust the potentiometer near one of the EL84 tubes, if that doesnt help, try to measure the 5W 1000ohm resistor. Replace it if has gone high. You may need to adjust the potentiometer to make the exciter lamp work.

Atreju
January 2009

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Free repair help for Bell & Howell 642 film projectors