Horizontal Streaks Or Bands (White/Black) - Kyocera ECOSYS P2235dw Service Manual

(2-3) Horizontal streaks or bands (white/black)

Step Check description
1 Checking the developer
unit
2 Replacing the developer
unit
3 Executing Drum refresh
4 Replacing the drum unit
5 Cleaning the main charger
wire
6 Changing the settings
7 Checking the connection
8 Replacing the high voltage
PWB
9 Replacing the main/engine
PWB
Assumed cause
Both ends of the developer
roller are dirty and it
causes the developer bias
leakage.
Both ends of the developer
roller and the developer
bias contact are deterio-
rated and it causes the
developer bias leakage.
The drum surface is dirty.
There are some scratches
on the drum surface.
The main charger wire sur-
face is dirty.
The electric charge
remains on the drum sur-
face due to insufficient dis-
charging.
The connector is not prop-
erly connected or the wire
is faulty.
The bias voltage is gener-
ated unevenly from the
high voltage PWB since
the PWB is faulty.
The main/engine PWB is
faulty.
7-17
2RV/2RW/2RX/2RY/3RA-3
Measures
Clean both ends of the devel-
oper roller and main charger
contact.
Replace the developer unit.
Execute Drum refresh.
Replace the drum unit.
Clean the main charger wire
surface. If not repaired,
replace the main charger
unit.
Execute [MC] at [System
Menu/Counter] key > [Adjust-
ment/Maintenance] > [Ser-
vice Settings] to reduce the
main charger output value.
Clean the terminal of the fol-
lowing wire connectors and
reconnect the connectors. If
there is no continuity, replace
the wire.
• High voltage PWB - Main/
engine PWB (YC16)
Replace the high voltage
PWB.
Replace the main/engine
PWB.
Reference