Kyocera TASKalfa 7002i Service Manual page 936

(5-14) Vertical uneven density
Step Check description
1 LSU replacement
2 Executing Drum refresh
3 Setting the cassette heater The image forming section
4 Checking the main charger
unit
5 Drum unit replacement
6 Checking the developer
unit
Assumed cause
LSU emits the laser
unevenly. (Inner mirror
comes off.)
The drum surface has con-
densation.
is affected by humidity.
The main charge roller sur-
face is dirty in the shape of
a streak.
The drum surface is worn
down.
The toner layer on the
developer roller is uneven.
7-76
Measures
Replace the LSU.
Execute Drum refresh.
[Cassette heater standard
model]Connect the cassette
heater and set U327 if neces-
sary.[Cassette heater
optional model]Install the
cassette heater and set U327
if necessary.
Clean the main charger roller
surface. Replace the main
charger roller unit if the issue
is not resolved.
Replace the drum unit.
Execute the developer
refresh. If not repaired,
replace the developer unit.
2WA/2NJ/2RK
Reference
Detaching
and Reat-
taching the
LSU
Installing
the cas-
sette
heater
Detaching
and reat-
taching the
main char-
ger roller
unit
Detaching
and Reat-
taching the
drum unit