2WA/2NJ/2RK
7-69
(5-6) Irregular horizontal white spreads or spots appear on the image
10 Replacing the high-volt-
age PWB
The high-voltage PWB is
faulty and the bias is not
output evenly.
Replace the high-voltage
PWB.
Detaching
and Reat-
taching the
high-volt-
age PWB
Step Check description Assumed cause Measures Reference
1 Checking the installation
environment
The settings do not match
the installation environ-
ment (High altitude
exceeding 1,500m above
sea-level).
Change the setting of U140
[Altitude Adjustment] to
[1001-2000m]. (If the issue is
not resolved, further change
the setting to [2001-3000m]).
Then, enter U140 [AC Calib]
and [Calibration], and change
the setting of the faulty color
from [Off] to [On]. Set the set-
ting value of the faulty color
at [Magnification] to "0" or
less. (The lower limit value: -
10)
Executing
U140
2 Checking the main charger
roller contact
The main charger roller
contact does not ground.
Correct the main charger
roller contact so that it
grounds securely.
3 Checking the drum unit
and the developer unit
The drum unit is not prop-
erly installed, so it does not
ground the drum drive
shaft.
Reinstall the drum unit. Detaching
and Reat-
taching the
drum unit
Step Check description Assumed cause Measures Reference
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