Printer and Photocopier Troubleshooting and Repair Collection : Print head stepper                      
 Copyright © 1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying. I may be contacted via the Sci.Electronics.Repair FAQ (www.repairfaq.org) Email Links Page.

  << Ribbon does not advance a.. |  Index  | Motor driver blows fuses >>

Print head stepper

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 motor movement.

(From: Ralph Wade Phillips (ralphp@gcstation.net).)

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 deader'n'snot.

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.