Hey guys, I posted here recently about a problem where the back tension arm on my VCR= got pinned down by the left shuttle assembly during unthreading.
I've fixed that issue, and I've retimed all the gears. I'm pretty confiden= t that the timing is correct, because all of the holes line up, and the uni= t can be easily threaded and unthreaded manually by turning the worm wheel.= Everything seems to move as it should, when it should. (There's a possib= le exception with my right shuttle: It could possibly be off by one tooth,= since the gear looks slightly different from what the service manual shows= , and the arrows are unhelpful. However, moving this gear a tooth in eithe= r direction does not affect my current issue, and it's in the middle positi= on of only three that allow the shuttle to easily move all the way to both = ends of the VCR.)
However, I cannot get system control to understand that the system is prope= rly unthreaded. Whenever I turn the power on, it tries to unthread. If I = start the gears out unthreaded, the motor will encounter resistance, and th= e machine will error out. If I start the gears out threaded, it will unthr= ead, keep trying to go farther, encounter resistance, and error out. If I = disconnect the motor from the gears, it will time out, then error out. It'= s always the same error, 09-821, which indicates the system could not unthr= ead in the specified time.
I've tried disconnecting the unit from power for hours at a time, and the s= tupid thing still thinks it needs to unthread. The mode switch doesn't use= any levers or moving parts: It bounces light off of reflective tracks on = the back of the mode gear, which is perfectly timed with the rest of the pa= rts.
Does anyone have any ideas how to approach fixing this?