TAG 811: Background/Residual Images/Dark Prints
3-184 Troubleshooting Analysis Guide (TAGs) June 1999
15
Reconnect J/P41 and J/P24.
• Turn the printer on.
• Run test prints.
• Check TP4-40 for 0.5 Vdc while running the prints.
Is the voltage 0.5 Vdc?
No: Replace the PCL board, then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
16
Is a meter with a high voltage probe available?
No: Go to #19 in this TAG.
Yes: Continue.
17
Using a high voltage probe, check J/P25-7 for the proper voltage, as described in Chapter 9, “Gen-
eral Printer Maintenance”.
Is the voltage correct?
No: Replace the high voltage unit, then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
18
Check the charge corona, transfer corona, grid, and cleaning bias described in Chapter 9, “General
Printer Maintenance”.
Are any of the values out of specification?
No: Go to #20 in this TAG.
Yes: Replace the high voltage unit, then turn to TAG 002: Check & Problem Resolution.
19
Replace the high voltage unit.
Has the problem been resolved?
No: Reinstall the original high voltage unit and continue.
Yes: Turn to TAG 002: Check & Problem Resolution.
20
Replace the PCL board.
Has the problem been resolved?
No: Reinstall original PCL board. Go back to #3 in this TAG. If this does not resolve the prob-
lem, the IGS board, cleaner terminal assembly, or charge corona terminal assembly may
be at fault. Determine which of these is at fault, correct the problem, then turn to TAG
002: Check & Problem Resolution.
Yes: Turn to TAG 002: Check & Problem Resolution.
21
Check J/P40-31 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.
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