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Light that enters the machine while some covers are removed may
cause background.
FRU
1
Erase LED
2
Printhead
3
Transfer
Corona
4
• Contact
Springs
• Engine
Board
• HVPS
• Intercon-
nect Board
2-18
Action
See the
"Erase LED Service Check" on page
The printhead is a sealed unit and cannot be
cleaned. Try a replacement printhead only if all
other attempts to correct a background problem fail.
Check the transfer corona assembly for signs
of toner buildup and contamination. Use the
cleaning tool provided with the printer to clean
the wire. Check the wire for damage. The wire
should be positioned across the corona hous-
ing. Replace the corona if the wire is broken,
stretched, or loose.
Corona Service Check" on page
Check the contact spring and HVPS contact for pit-
ting, cable interference, or incorrect installation.
Clean if necessary.
Check the voltages on the engine board at the fol-
lowing locations;
Printer Idle:
CNMC-B10 = +24 V dc
CNMC-B11 = +17 V dc
CNMC-A11 = +20.5 V dc
CNMC-B12 = +0.1 V dc
Printer Printing:
CNMC-B10 = +0.1 V dc
CNMC-B11 = +0.1 V dc
CNMC-A11 = +0.1 V dc
CNMC-B12 = momentarily jumps up to 5 - 15 V dc.
If these voltages are not correct, replace the engine
board. If they are correct, replace the following
FRUs in the order shown:
1. HVPS
2. Interconnect Board
See also the
"Transfer
2-29.
2-11.
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