2NC/2NF/2NG/2NN/3P7/3P8/3P9
1-4-72
(4) The background is colored.
Print example Cause of trouble
1. Toner is deteriorated in quality (under-charged).
2. Toner is over-supplied.
3. Developing bias is too high.
4. The layer of toner is too thick on the developing roller (too much toner).
5. The surface potential of the drum is too low (under low temperature
environment).
Defective part Check description Corrective Action
1
Developer unit Executing U089 to generate PGs
and check the following :
(see page 1-3-41)
1. Check whether the device
was being continuously
operated with high density,
under a hot environment.
If the device was being continuously operated
with high density under a hot environment,
perform developing refreshing. (System Menu
>Adjustment / Maintenance)
2. Check contamination and
deformation on the
connecting terminals for
developer bias.
If the connecting terminals for developer bias
are dirty, clean.If the connecting terminals are
deformed, correct for a proper conduction.
2
Toner supply motor Check the toner supply motor is
continuously rotating.Check
wires for shortcircuiting.
If the harnesses are short-circuited and the
toner motor is continuously rotating,
replace the toner supply motor.
3
Drum unit 1. Conduct U139 to check the
internal temperature.
(see page 1-3-50)
If the internal temperature is 16-degree C or
less, continue printing until the temperature
reaches 16-dgree C or higher.
2. Check that the ground
terminal is not contaminated
or the conductive grease is
not applied with the
connecting terminals.
If the connecting terminals are dirty, clean.
If the amount of the grease applied is too
small, apply conductive grease to the bearing
on the receiver side of the drum drive axle.
Replace the drum unit. (Performs U119)
3. Check if the charging roller is
dirty.
If the charging roller is dirty, clean.Or replace it.
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