2-88 Service Manual
4500
Heavy background
Poor development or poorly charged toner particles cause excessive
background. This is more noticeable as the toner cartridge nears
end–of–life.
FRU Action
Toner cartridge (not a FRU) Make sure the toner cartridge is
correctly installed and the high
voltage contacts are clean.
If the cartridge is installed correctly,
try a new cartridge.
HVPS contacts
HVPS board
Engine board
Controller card
Check the contacts for correct
installation and contamination where
contact is made with the toner
cartridge and HVPS board. Clean as
necessary.
If this does not correct the problem,
replace the following FRUs one at a
time in the order shown:
• HVPS board
• Engine board (E220/E321/E322)
or
• Controller card (E220/E321/E323)
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