Kyocera TASKalfa 7002i Service Manual page 896

(3-7) Vertical black / color streaks or band
Step Check description
1 Checking the original
2 Checking the settings
3 Checking the original
cover
4 Executing U067
5 Executing U411
6 Checking the contact glass The contact glass or the
7 Checking the mirror
8 Checking the lamp unit
assy (mirror frame A, B).
9 Cleaning the CCD PWB
10 Executing U063
11 Replacing the ISU
12 Replacing the engine PWB The engine PWB is faulty.
13 Replacing the main PWB
Assumed cause
The original is dirty.
Actual original size and
detected original size are
mismatched.
The original cover is dirty.
The center line settings are
incorrect. (The streaks or
bands appear out of the
original image.)
The leading edge timing is
incorrect. (Streaks or
bands appear out of the
original.)
shading plate at the back-
side of the contact glass is
dirty.
The mirror is dirty.
The dust is adhered on the
lamp unit assy (mirror
frame A, B).
Dust is on the CCD PWB.
The image scanning posi-
tion is incorrect.
The CCD PWB is faulty.
The main PWB is faulty.
7-36
Measures
Replace the original.
Set the original paper size.
Clean the original cover.
Adjust U067 [Front].
Execute U411 [Table(Chart
A)].
Clean the contact glass and
the shading plate at the back-
side of the contact glass.
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).
Clean the CCD PWB using
an air-blower.
Execute U063 to change the
scanner shading position.
Replace the ISU.
Replace the engine PWB.
Replace the main PWB.
2WA/2NJ/2RK
Reference
Executing
U067
Executing
U411
Executing
U063
Detaching
and Reat-
taching the
ISU
Detaching
and Reat-
taching the
engine
PWB
Detaching
and Reat-
taching the
main PWB