Vertical Streaks And Bands (Black) - Kyocera ECOSYS P2235dw Service Manual

(2-6) Vertical streaks and bands (black)

Step Check description
1 Executing Drum refresh
2 Replacing the drum unit
3 Cleaning the main charger
wire
4 Replacing the main char-
ger unit
5 Checking the developer
unit
(2-7) Blank image
Step Check description
1 Checking the developer
bias contact
2 Replacing the developer
unit
3 Checking the connection
4 Checking the connection
5 Checking the developer
clutch
6 Replacing the high voltage
PWB
7 Replacing the LSU
8 Replacing the main/engine
PWB
Assumed cause
The drum surface is dirty.
The drum surface is worn
down.
Streaky dirt adhere to the
main charger wire surface.
The main charger wire sur-
face is altered.
Foreign objects are on the
developer roller surface.
Assumed cause
The developer bias contact
is dirty or deformed.
The developer unit side
gear is faulty.
The FFC is not properly
connected or faulty.
The connector is not prop-
erly connected or the wire
is faulty.
The developer clutch or
drive parts do noto operate
properly.
The high voltage PWB is
faulty.
The APC PWB in the LSU
is faulty.
The main/engine PWB is
faulty.
7-19
2RV/2RW/2RX/2RY/3RA-3
Measures
Execute Drum refresh.
Replace the drum unit.
Clean the main charger wire
surface.
Replace the main charger
unit.
Clean the developer roller. If
not repaired, replace the
developer unit.
Measures
Clean the developer bias
contact, or correct its shape
so that it grounds securely.
Replace the developer unit.
Reconnect the FFC. If the
FFC terminal is peel,
deformed or broken, replace
it.
• LSU (APC PWB) - Main/
engine PWB (YC505)
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)
Reattach the developer
clutch and reconnect the con-
nector. If not repaired,
replace it.
Replace the high voltage
PWB.
Replace the LSU.
Replace the main/engine
PWB.
Reference
Reference