Kyocera TASKalfa 7002i Service Manual page 898

(3-9) Vertical white streaks or band
Step Check description
1 Checking the original
2 Checking the mirror
3 Checking the lamp unit
assy (mirror frame A, B).
4 Checking the lens cover
5 Checking the shading
plate
6 Replacing the ISU
7 Checking the engine PWB
8 Replacing the main PWB
Assumed cause
The original is dirty.
The mirror is dirty.
The dust is adhered on the
lamp unit assy (mirror
frame A, B).
The lens cover is off.
The shading plate at the
backside of the contact
glass is dirty.
The CCD PWB is faulty.
The connectors or the
FFCs on the engine PWB
are not properly con-
nected. Or the wires, FFCs
or the engine PWB are
faulty.
The main PWB is faulty.
7-38
Measures
Replace the original.
Clean the mirrors of the lamp
unit assy (mirror frame A, B).
Remove dust on the laser
path of the lamp unit assy
(mirror frame A, B).
Reattach the lens cover.
Execute U063 to change the
scanner shading position.
Replace the ISU.
Reconnect the connectors on
the engine PWB. Then, fix or
replace the wires if they are
pinched by the other part or if
they have any damage.
When the issue is not
resolved after that, replace
the engine PWB.
Replace the main PWB.
2WA/2NJ/2RK
Reference
Detaching
and Reat-
taching the
lens unit
Executing
U063
Detaching
and Reat-
taching the
ISU
Detaching
and Reat-
taching the
engine
PWB
Detaching
and Reat-
taching the
main PWB