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COPY QUALITY TROUBLESHOOTING
7.1.8 HORIZONTAL WHITE LINES
Possible Cause (Printer)
• A damaged or deformed development roller surface.
• The development bias is unstable.
• The transfer current is unstable.
Action:
1. Print a test pattern, and open the cover in the middle of printing.
2. Check to see if horizontal white lines (where toner is not adhered) appear on
the drum surface or not.
• If not, check the transfer roller surface and the transfer bias terminal
connections. If they are OK, check or replace the power pack.
• Change the cartridge.
H545T509.WMF
7-8
30 November, 1999
H545T511.WMF
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