Confirm that you simply don't have bad solder connections around the plug to
the motor. This is common in printers and will result in erratic or incorrect
|Printer and Photocopier Troubleshooting and Repair Collection : Print head stepper
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| Motor driver blows fuses >>
(From: Ralph Wade Phillips (firstname.lastname@example.org).)
What's common in some older Okidata 32x's and 39x's is that the lithium
battery ABOVE the stepper driver will spring a leak, and drop the lithium
compound onto the legs of the stepper. I do not know for sure if it's
corrosive, conductive, or just plain nasty, but it kills the stepper
I'd LOVE to find a replacement - I've got a service customer that has about
2,500(!!!) 320's and 321's in the field, and I am not looking forward to
having to exchange all those boards over the next several years.