2WA/2NJ/2RK
7-71
(5-8) The entire image is too light
Step Check description Assumed cause Measures Reference
1 Reinstalling the toner con-
tainer
Toner is collected on one
side.
Sufficiently shake the toner
container and reinstall it to
the main unit.
Detaching
and reat-
taching the
toner con-
tainer
2 Checking the toner supply
opening
The toner supply opening
does not open.
Replace the toner container. Detaching
and reat-
taching the
toner con-
tainer
3 Measures for improving
the image quality
Toner is deteriorated due
to frequent low coverage
printing.
Execute "Developer
Refresh", "Calibration" and
"Tone Curve Adjustment" in
order.
4 Checking the drum unit
and the developer unit
The drum unit or the devel-
oper unit is not properly
attached, and so the devel-
oper roller does not con-
tact the drum.
Reinstall the drum unit and
the developer unit.
Detaching
and reat-
taching the
drum units
/ devel-
oper unit
5 Checking the developer
bias contact
The developer bias contact
is deformed.
Correct the developer bias
contact so that it grounds
securely.
6 Executing U140 The developer bias values
that are fixed (except
"Sleeve AC" and "Mag
DC") and are not changed
according to the Calibra-
tion are changed from the
default value.
Execute U140 and reset the
developer bias to the default
value.
Executing
U140
7 Checking the developer
unit
The DS pulleys are dirty. Clean the DS pulleys at both
ends of the developer unit.
8 Developer unit replace-
ment
The DS pulleys are faulty. Replace the developer unit. Detaching
and Reat-
taching the
developer
unit
9 Checking the developer
unit
The toner sensor has a
fault and so toner is not
supplied.
Execute Developer Refresh
when the PG image output as
test page is too light. If the
issue is not resolved, replace
the developer unit.
Detaching
and Reat-
taching the
developer
unit
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