Field Service Ver. 1.0 Jun. 2008
19. Image quality problem
321
T
roubleshooting
19.3 Solution
NOTE
• Typical faulty image samples shown in the following are all printed with A4S set-
ting.
19.3.1
Scanner system: white lines in sub scan direction, white bands in sub
scan direction, colored lines in sub scan direction, and colored bands in
sub scan direction
A. Typical faulty images
B. Troubleshooting procedure
(1) When the original glass is used
A02EF4C507DA
White lines in sub scan
direction
White bands in sub
scan direction
Color bands in sub
scan direction
Color lines in sub scan
direction
Step
Section
Check item
Result
Action
1
Original
Original is damaged or dirty.
YES
Change original.
2
Original cover
Original pad is dirty.
YES
Clean.
3
Original glass
Original glass is dirty.
YES
Wipe the surface clean with
a soft cloth.
4
Shading sheet
Shading sheet is dirty.
YES
Wipe the surface clean with
a soft cloth.
5
Mirror, lens,
exposure lamp, and
reflectors
Mirror is dirty
YES
Clean.
Lens is dirty
YES
Clean.
Exposure lamp is dirty
YES
Clean.
Reflectors are dirty
YES
Clean.
6
Machine Adjustment
o
Scan Area
o
Feed
adjustment
(Service Mode)
The adjustment value for [Feed]
falls within the specified range.
NO
Readjust.
7
The white lines/bands or colored
lines/bands are blurry.
YES
Change exposure unit.
d
-Color
M
F
201
Y109660-1 Sevice Manual