Confidential
9-33
I-9
Black Line
Phenomenon
Fine black line appears in the printed image as shown in print sample [9] of Fig.9-1.
Main Causes
(1) The toner cartridge PU blade is deformed.
(2) The OPC belt surface is damaged.
(3) Foreign particles (paper dust, etc.) are stuck in between the cleaning blade and the OPC belt.
(4) Foreign particles adhere to the perimeter parts of the OPC belt and the transfer belt, and
consequently contact the toner image formed on the belt.
Fig. 9-10
Countermeasures
(1) Replace the toner cartridge PU with a new toner cartridge PU.
(2) Replace the belt cartridge PU with a new belt cartridge PU.
(3) Clean the perimeter of the mounting area of the OPC belt and transfer belt.
Toner cartridge PU
(K, Y, M, C)
Laser ASSY PU
Paper tray PU
Top cover PU
Belt cartridge PU
OPC belt cartridge PU
OPC belt
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