TAG 800: Prints Blank or With Dark Horizontal Bands
3-148 Troubleshooting Analysis Guide (TAGs) June 1999
5
Replace the developer unit and toner cartridge.
• Run test prints.
Has the problem been resolved?
No: Reinstall the original developer unit and continue.
Yes: Turn to TAG 002: Check & Problem Resolution. If the problem recurs, the toner carrier
mix may be old or contaminated.
6
Produce a developed image on the photoconductor.
Is a developed image on the photoconductor?
No: Go to #10 in this TAG.
Yes: Continue.
7
Remove and clean the transfer corona unit.
• Clean the transfer corona unit contacts in the upper paper guide.
• Inspect the transfer corona contacts for proper alignment.
• Reinstall the transfer corona unit.
• Power-on-reset the printer.
• Run test prints.
Has the problem been resolved?
No: Continue.
Yes: Turn to TAG 002: Check & Problem Resolution.
8
Turn the printer off and unplug the power cord.
• Remove the transfer corona unit.
• Check the lower transfer corona unit contact, with the upper paper guide assembly in its fully
upright position, for continuity to ground.
Is there continuity?
No: Replace the upper paper guide assembly, then turn to TAG 002: Check & Problem Reso-
lution.
Yes: Continue.
9
Replace the transfer corona unit.
• Power-on-reset the printer.
• Run test prints.
Has the problem been resolved?
No: Replace the upper paper guide assembly. If this resolves the problem, turn to TAG 002:
Check & Problem Resolution. If this does not resolve the problem, replace the high volt-
age unit, then turn to TAG 002: Check & Problem Resolution.
Yes: The transfer corona unit was at fault. Turn to TAG 002: Check & Problem Resolution.
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