Konica Minolta bizhub C658 Service Manual page 1634

bizhub C658/C558/C458/C368/C308/C258
Step Section
6 2nd transfer section
7 Fusing unit
8 Fusing unit
(5) Scanner troubleshooting procedure
Step Section
1 Original
2 When original glass is
being used
3 When DF is being used:
1st side
4 When DF-629 is being
used: 2nd side
5 DF-704 or dual scan
document feeder is being
used: 2nd side
Main body side_original glass
6 DF side_ Original pad
7 Original glass
8 Shading sheet
9 End face of original is
reproduced as a line
10 Line occurring due to
faulty shading
11 Parts along scanning
path
Main body side_DF original reading section
12 Main body side_reading
section
13 DF side_ document
reading glass cleaning
brush
14 Main body side_shading
sheet
15 When DF is being used:
2nd side: End face of
original is reproduced as
a line
16 When DF-629 is being
used: 2nd side: end face
of original is reproduced
as a line
17 Service Mode -> Read
Pos Adj
Check item
There is a positive contact between the application
terminals of the 2nd transfer and the connection
terminals (T2, E) and ground terminal of the high
voltage unit.
There is dirty or foreign matter on paper path of fusing
unit.
Scratches on belt and roller in fusing unit.
Check item
Original is damaged or dirty.
A fault occurs in the image read through the original
glass.
A fault occurs in the image read from the 1st side while
DF is being used.
A fault occurs in the image read from the 2nd side while
DF-629 is being used.
A fault occurs in the image read from the 2nd side while
DF-704 or dual scan document feeder is being used.
Original pad of DF is dirty.
Original glass is dirty.
Shading sheet is dirty.
Select [Service Mode] -> [Machine] -> [Scan Area] ->
[Scanner Image Side Edge] and make the necessary
adjustment, and the image trouble is eliminated.
Select [Service Mode] -> [Machine] -> [Scan Area] ->
[Image Position: Leading Edge] and make the
necessary adjustment, and the image trouble is
eliminated.
Mirror, lens, light guide or reflectors is dirty.
Document reading glass of main body is dirty.
Document reading glass cleaning brush of DF is dirty.
Shading sheet of main body is dirty.
Select [Service Mode] -> [ADF] -> [Original Stop
Position] -> [Sub Scanning Direction
the necessary adjustment, and the image trouble is
eliminated.
Select [Service Mode] -> [ADF] -> [Original Stop
Position] -> [Sub Scanning Direction
the necessary adjustment, and the image trouble is
eliminated.
Select [Service Mode] -> [ADF] -> [Read Pos Adj] ->
[Auto Adjust] and the image trouble is eliminated.
K-306
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO Clean or correct the terminal.
YES Clean. (Disassembling the fusing
unit is prohibited.)
YES Replace the fusing unit.
C368/C308/C258
C558
NO
Result
YES Change the original.
YES Go to step 6.
YES Go to step 12.
YES Go to step 12.
YES Go to step 20.
YES Clean.
YES Clean.
YES Clean.
NO Go to the next step.
NO Go to the next step.
YES Clean.
NO
YES Clean.
YES Clean.
YES Clean.
NO Go to the next step.
1-Side] and make
NO Go to the next step.
2-Side] and make
NO Go to the next step.
Action
(bizhub
/ bizhub C658/
/ bizhub C458)
• Replace the high voltage
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
• Replace the MFP board.
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
Action
• Replace the LED exposure
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
• Replace the CCD unit.
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)