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Printer and Photocopier Troubleshooting and Repair Collection : Comments on copy problems               
 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.

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Comments on copy problems

(From: Copenhagen Cowboy (cowboy@fastlane.net).)

Copy problems can be hard to figure out, but given the evidence the copier gives you, you can now probably determine what to check.

Black or dark lines are mostly caused by dirty optics (not enought light getting to the Drum) Blank copies might be a broken corona wire, or even failed High Voltage board. Black copies can mean a bad exposure lamp (broken or burnt out) or failed exposure lamp thermal fuse. Black copies with even blacker images in them could be overtoned (too much toner in the developer unit) or bad drum ground (the drum cannot discharge {the voltages have nowhere to go, so they just stay on the drum). Bad drum grounds usually pull developer, and you get the grit on the copies.