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Printer and Photocopier Troubleshooting and Repair Collection : Streaky copies                          
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Streaky copies

(From: Bernard Morey (bmorey@melbourne.DIALix.oz.au).)

Well, I discovered that streaky copies are caused by dirty corona wires (fixed easily, although 1 unit was held by a screw-in plate, rather than the usual pull-out method) and that dirty corona wires seems to be caused by excessive toner deposition (haven't figured that out yet).

(From: Lionel Wagner (ck508@FreeNet.Carleton.CA).)

If the streaks are white, in black areas, clean or replace the corona wires. If the streaks are narrow black and run the entire length of the page, replace the soft plastic wiper blade on the drum (and hope the drum is not scratched). Black smudges are related to the toner/developer purity. Replace both.