One Side Of The Print Image Is Darker Or Brighter Than The Other - Kyocera TASKalfa 6501i 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
ISU
8
LED PWB
9
LED Assy
10
Lamp unit
11
Mirror unit
12
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.
Check the location the ISU unit
is mounted.
Check that the LED is lit.
Check the mounting position of
the refelector board or if it is dis-
torted.
Check that the contact part of
the lamp unit and the rail is dis-
torted.
Check the location the mirror is
mounted.
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.
Insert a spacer between the scanner unit and
the ISU to change the height.
(see page 1-5-44)
If the LED is not lit, replace the LED PWB and
perform U411.(see page 1-3-152)
If the LED assy is hanged off of the mounting
position of the reflector or it is deformed,
replace the LED assy.
If the contact part of the lamp unit and the rail is
distorted, replace the lamp unit.
Re-mount the mirror if it is hanged off. Or, if the
mirror is damaged, replace.
1-4-181
Corrective Action
2N8/2N7