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Old 1st Jun 2019, 9:27 pm   #41
af024
Octode
 
Join Date: Jan 2003
Location: Ashby-de-la-Zouch (it's not by the sea)
Posts: 1,254
Default Re: Bell and Howell TQII 1652 16mm projector

Yes everything is coupled to the one motor. Obviously sprocket 'pips' need to be in the right place in relation to the claw and shutter mech, else if not, it would either not auto-thread properly or you'd end up with too big (or too small) a loop (or loops) and possible film damage. Obviously the sound drum/mech also has to be in the correct place too. All good fun. Yes mine has the slipping fabric belt idea to couple up the take-up.

Hopefully the output transistor is ok, as mentioned above (thank you for those comments). So perhaps there's something gone wrong with the internal conversion of frequency to volts (or current) in the module? Maybe, when I get a chance, I should de-couple the tacho and substitute it for a signal generator and do a frequency sweep to see if anything happens to the motor speed? It may still kick in but at a much higher (or lower?) frequency than it should.
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Now where on earth did I remove that from?
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