HP C30 - Page 226

TAG 808: Prints Overtoned/Dark Vertical Streaks
3-172 Troubleshooting Analysis Guide (TAGs) June 1999
5 Replace the cleaner unit.
• Run test prints.
Has the problem been resolved?
No: Reinstall the original cleaner unit and continue.
Yes: Turn to TAG 002: Check & Problem Resolution.
6 Replace the developer unit with 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.
7 Turn the printer off.
• Open the front cover and install an interlock by-pass tool.
• Remove the developer unit.
• Power-on-reset the printer.
• Watch the toner motor coupling at the rear of the developer cavity.
Does the coupling turn continuously?
No: Go to #10 in this TAG.
Yes: Continue.
8 Check TP3-31 for 0 Vdc.
Is the voltage 0 Vdc?
No: Replace the power control #2 board, then turn to TAG 002: Check & Problem Resolu-
tion.
Yes: Continue.
9 Turn off the printer and unplug the power cord.
• Disconnect J/P12 and J/P40.
• Check P40-31 to P12-5 for continuity.
Is there continuity?
No: Repair or replace the connectors or wiring from P40-31 to P12-5, then turn to TAG 002:
Check & Problem Resolution.
Yes: Replace the power control #2 board. If this resolves the problem, turn to TAG 002: Check
& Problem Resolution. If this doesn’t resolve the problem, replace the PCL board, then
turn to TAG 002: Check & Problem Resolution.