Konica Minolta bizhub C250 Service Manual page 523

18. Image quality problem
18.3.4 Scanner System: fog
A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
1 Original
2 Original Cover
3
Original Glass
4
Shading sheet
5
6 Mirror, lens, Exposure
Lamp, and reflectors
7
8
9
Basic Screen
10 Quality/Density
11
480
ABCD
ABCD
ABCD
ABCD
ABCD
4036fs4030c0
Check Item
Original is damaged or dirty.
Original Pad is dirty.
Original Cover does not lie flat.
Original Glass is dirty.
Shading sheet is dirty.
Mirror is dirty.
Lens is dirty.
Exposure Lamp is dirty.
Reflectors are dirty.
The problem is eliminated when the
image is produced in the Manual
exposure setting.
The problem has been eliminated
through the checks of steps up to
10.
Field Service Ver. 3.0 Aug. 2006
Result Action
YES Change original.
YES Clean.
YES Change Original Cover if it
is deformed or hinges are
broken.
YES Wipe the surface clean
with a soft cloth.
YES Wipe the surface clean
with a soft cloth.
YES Clean.
YES Clean.
YES Clean.
YES Clean.
NO Try another exposure level
in Manual.
NO Change Scanner Assy.
Change CCD Unit.