Brother MFC-9420CN Service Manual page 253

I-2 Missing Image at Edge
Phenomenon
There is missing or peeling toner found in the image at the edge as shown in the
Fig.9-1.
Main Causes
(1) Too small toner mass amount and charging amount in the development process.
(2) The OPC belt is deformed as waving.
OPC belt
Countermeasures
(1) Replace the toner cartridge PU with a brand new toner cartridge PU.
(2) Replace the belt cartridge PU with a brand new belt cartridge PU.
Belt cartridge PU
Fig. 9-3
9 - 2 6
print sample [2] of
Toner cartridge PU
(K, Y, M, C)
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