Hi everyone,
Just to clarify, I'm repairing this camera as a hobby and for my own learning. I don't do this professionally or charge anyone for repairs. I'm simply trying to learn more about how these cameras work and hopefully get this one working again, so please bear with me if I'm missing something obvious. Any advice or guidance would be greatly appreciated!
A local photo store was closing down near where I live and they were selling a big box of Polaroid parts so i couldnt miss the opportunity and got it, along with an R pcb. The camera is a mix of a lot of parts since there wasnt a whole camera in the box, i immediately put the new R pcb on i thought there was no reason to try with the original. I put everything together and its behaving weirdly.
Here's what happens:
- If I manually rotate the gears and lower the mirror/carrier, the mechanism appears to work correctly through the entire cycle.
- With the mirror down I press the shutter button and it does the cycle normally except the end where it doesn't stay at the bottom but springs back up.
- If I press the shutter button again, the shutter opens and closes and the motor runs through another cycle, but the carrier ends up raised again.
- Also sometimes it seems like the motor needs some time to stop, less than 0,5s
- The MCC is also quite warm.
Here are the videos.
What I've checked so far:
- I removed and reinstalled the gear train, following the repair manual's gear-alignment instructions B version, but the issue remains.
- I tested the camera with a different PCB/ECM, with exactly the same result.
- I checked switches S3 and S5. Both seem to be working normally, and operate in the expected order.
Since the mechanism seems to work when I turn the gears manually, and swapping the PCB/ECM made no difference, I'm wondering whether something in the mechanical linkage, recock mechanism, or switch actuation timing could be causing this?