2WA/2NJ/2RK
7-63
Content of Engine Factors (Image forming cause)
(5-1) Colored background
Step Check description Assumed cause Measures Reference
1 Measures for improving
the image quality
Uncharged toner increases
due to the continuous high
coverage printing in the
high temperature environ-
ment. Or the developer
bias in controlled at the
higher level since the cali-
bration was executed
when the density was too
light.
Execute "Developer
Refresh", "Calibration" and
"Tone Curve Adjustment" in
order.
2 Checking the developer
bias contact
The developer bias contact
is dirty or deformed.
Clean the developer bias
contact, or correct its shape
so that it grounds securely.
3 Checking the developer
unit
The toner sensor is faulty. Reinstall the developer unit.
Replace it if it is not fixed.
Detaching
and Reat-
taching the
developer
unit
4 Checking the temperature
inside the main unit
Temperature is low in the
installation environment.
When the internal tempera-
ture indicated in U139 is
16°C / 60.8°F or less, request
the user to change the instal-
lation environment where the
room temperature is warmer
than 16°C / 60.8°F.
Executing
U139
5 Checking the drum unit
and the developer unit
The drum unit does not
ground.
Reattach the main charger
roller unit to the drum unit
and reinstall the drum unit
into the main unit to ensure
secure contact .
Detaching
and reat-
taching the
drum unit /
main char-
ger roller
unit
6 Checking the settings The setting value of the
main high-voltage is incor-
rect.
If the setting values at U100
are not the default values,
reset them to the default val-
ues.
Executing
U100
7 Checking the main charger
unit
The main charger roller
surface is dirty.
Clean the main charger roller
surface. Replace the main
charger roller unit if the issue
is not resolved.
Detaching
and reat-
taching the
main char-
ger roller
unit
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