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@brian@awesome.garden
Post #2208804
2026-04-12 23:19 UTC
@elb@social.sdf.org @bytex64@awesome.garden I found the service manual for the 3000S, which is (supposedly) nearly identical: https://phsc.ca/repair/GAF/gaf_projector_2000-3000-sears.pdf
I've at least determined that the lamp still works... so whatever is wrong isn't causing complete electrical failure. The motor does not run. However, if I manually move the pully attached to the motor, all the gears seem to move freely. I can switch between forward and rewind movement, etc. I don't see anything that is obviously burned out on the primary circuit board or any of the electronics but, as I mentioned, I'm not skilled in this arena. I'm wondering if the transformer itself has gone bad.
EDIT: Or the motor, of course. Would be hard to tell if that was burned out from the outside, I imagine. Either way... finding a replacement motor or transformer for this thing feels like it'd require finding another one that works anyway... haha
Replies (1)
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@brian@awesome.garden @elb@social.sdf.org Ah, very nice! Looking at the schematic, the lamp is before the transformer, so that still working rules out basically nothing other than the switch. 😅 Some other observations:
The audio side and transport motor are practically independent circuits. They even each have their own rectifiers. So if you can get anything out of the sound (by, I dunno, running the film manually?), that would imply that the problem is in the motor circuitry. If you're getting nothing but the lamp, the only other common component is the transformer, so that would suggest it's bad.
The motor circuitry is pretty simple, just a linear current regulator adjustable with switches. So if something has blown up due to overcurrent, it's almost certainly Q1.
Open ##2208805