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Print Quality - Residual Image
Install a new print unit if one is available, before you begin this check.
Residual image can be caused by the photoconductor, cleaning
mechanism, and other parts inside the print unit.
FRU
1
Erase LED
Assembly
2
Fuser
Print Quality - Banding
Banding appears as light or dark horizontal lines on a uniformly gray
page, or on a page with a large area of graphics. Banding is prima-
rily due to a variation in the speed of the paper as it feeds through
the printer, especially in the developer and transfer process. Inspect
the paper feed components, especially the drive gears, for signs of
wear, dirt, binds, or damage.
Print Quality - Background
Some background problems can be caused by an incorrect paper
setting. Be sure the correct paper type setting is selected for the
paper being used. Background can also be caused by an incorrect
setting on the print darkness control. The customer may try to
improve the print quality by adjusting the print darkness dial.
Action
Check the erase LED for signs of paper dust, toner
build-up or other contamination. Clean with a soft
cloth or replace the erase LED assembly. When the
erase LEDs work properly, each LED turns bright
red. This is visible with the print unit removed, by
opening the upper door during the warming engine
step in the POST procedure. If the erase LEDs do
not come on, check the voltage at CNERS-1 on the
engine board. It should measure +24 V dc. If it is
incorrect, replace the engine board. If it is correct,
replace the erase LED assembly.
Check the fuser for signs of toner buildup on the hot
roll. Toner buildup could cause the hot roll to pick up
toner and deposit it down the page. If buildup is
present, replace the fuser.
Diagnostic Information 2-17
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