Confidential
9-25
I-1 Background
Phenomenon
Background is smeared due to toner spread as shown in print sample [1] of Fig.9-1.
Main Causes
(1) Too small charging amount in the development process.
(2) Insufficient contact of the developer roller's bias pole.
(3) Life or failure of the belt cartridge PU.
(4) Failure of the HV power supply unit PU (HVU).
Fig. 9-2
Countermeasures
(1) Replace the toner cartridge PU.
(2) Confirm if the developer bias pole is deformed or not.
(3) Replace the belt cartridge PU.
(4) Replace the HV power supply unit (HVU).
Belt cartridge PU
Toner cartridge PU
(K, Y, M, C)
OPC belt
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