Re: Bell and Howell TQII 1652 16mm projector
Hello Lucien,
It looks like a '9' on the sheet, but the original resolution isn't great. Funny you were enquiring about this pin 6/pin 4 business, because I was just trying to trace things though again against your fantastic drawings (nothing untoward spotted thus far).
Something is just slightly clipped left of frame on drawing (3) on the ground line however. Would that be pin 4 perhaps?
Looking at the PCB, the bulk of the copper track ends up going to pin 4 with just a thin track joining pin 6 to the main bulk of it.
Is Z1 some kind of varister perhaps?
Interesting. Still not sure how it works though.
Regards and grateful thanks,
Andy
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Now where on earth did I remove that from?
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