One Side Of The Print Image Is Darker Or Brighter Than The Other - Kyocera ECOSYS M3040dn Service Manual

(8) One side of the print image is darker or brighter than the other.

Print example
1. Table scanning
Defective part
Original document
1
Original document
2
Position of the mat
of the platen
3
Contact glass
4
Contact glass assy Check the location the contact
5
Lamp unit
6
Mirror
7
CCD PWB
8
Control PWB
9
2. DP-scanning
Defective part
Original document
1
Original document
2
DP scanning guide Check that the scanning guide is
3
Check description
Check whether the original
document is dirty.
Check if the original document
has creases or foldings or wrin-
kles.
Check whether the position of
the mat of the DP or the platen is
wrong.
Check whether the contact glass
is dirty.
glass is mounted.
Check the position at which the
light guide panel is mounted.
Check whether the mirrors are
dirty.
The CCD PWB is defective.
The control PWB is defective.
Check description
Check whether the original
document is dirty.
Check if the original document
has creases or foldings or wrin-
kles.
smoothly operative.
If the original document is dirty, replace.
If the original document has foldings or
creases, remove them.
If the position of the mat of the DP or the platen
is shifted, re-mount.
If the contact glass is dirty, clean the contact
glass, and the bottom part of the shading plate.
If the light guide panel has been fallen off of the
mounting position, fix it properly.
If the contact part of the lamp unit and the rail is
distorted, replace the lamp unit.
If the mirrors are dirty, clean the three mirrors.
Replace the ISU and perform U411.
(see page 1-3-54)
Replace the control PWB.(see page 2-2-12)
If the original document is dirty, replace.
If the original document has foldings or
creases, remove them.
If the scanning guide does not rotate smoothly,
re-install.
1-4-58
2NM/2NX/2NY/2NZ/2P0/2P6
Corrective Action
Corrective Action