/diy/ - Do It Yourself

>>2763809
>>2763818
The motor is a 7.5 degree stepper motor, which is still somewhat available, but I'd have to modify it, since mine has an additional plate with a protruding shaft for a gear on the top, which the ones I can find on ebay don't have. Seems spot-welded, at least I can't find any screws.
At least that explains the wiring, so most likely no rotary encoder.
Additionally, I found that the motor connector on the logic board goes to a group of darlingtons, then further to logic level inverters and finally to an IC I can't really find much about. It's marked as D65022GF116, made by NEC, the manufacturer of the printer itself, so I guess it's some form of ASIC.
There's a broken trace close to one of the darlingtons. I can't rule out that this has blown one of them, but since this trace goes to the positive power supply pin at least one of them is not powered right now. I'll fix the trace, if that doesn't work, I'll have to replace the darlington itself.