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4040
Dark Image Service Check
FRU
1
Image Density
2
High Voltage
Power Supply
3
High Voltage
Power Supply
4
System Board
Dirt on Back of Paper Service Check
FRU
1
• Transfer
Charging
Roller
• Lower
Fuser Roller
2-32
Action
The Image density may not be adjusted cor-
rectly. Adjust the Image density through the
host software.
The drum grounding contact of the high-volt-
age power supply may not be making a good
connection with the cartridge contact. If the
contacts are dirty, clean them. If the problem
continues after cleaning, or parts are
deformed or damaged, replace them.
The primary changing roller-bias contact (7-2)
of the high-voltage power supply may not be
making a good connection with the cartridge
contact. If the contacts are dirty, clean them. If
the problem continues after cleaning, or parts
are deformed or damaged, replace them.
The high-voltage power supply board may be
defective. Replace the high-voltage power
supply (Asm. 7).
The system board may be defective. (4-9)
Action
Check the rollers for dirt. If they cannot be
cleaned, replace them (18-21). If the dirt spots
on the paper are uniformly spaced approxi-
mately 56mm apart, the transfer charging
roller could be dirty or deformed.The transfer
charging roller is a supply item, replaced by
the customer.
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