Konica Minolta bizhub C658 Service Manual page 1642

bizhub C658/C558/C458/C368/C308/C258
(3) 1-color troubleshooting procedure
Step Section
1 Write section
2 Charging section
3 Service Mode -> Table
Number
4 Photo conductor section
5 Developing section
6 Hopper drive unit section Faulty connector connection between the toner supply
7 Hopper drive unit section Faulty in the drive of sub hopper.
8 Service Mode -> TCR
data
9 Service Mode -> Max
Image Density Adj
10 Service Mode -> Initialize
+ Image Stabilization
(4) 4-color troubleshooting procedure
Step Section
1 Transfer belt unit
2 2nd transfer section
3 Service Mode -> Max
Image Density Adj
Check item for the faulty color
Dirt or foreign matter on the dust-proof glass of the PH.
Foreign matter on charging roller.
Select [Service Mode] -> [State Confirmation] ->
Number]. The measured value is close to the standard
value.
• Developing bias: Vdc-C, Vdc-M, Vdc-Y, Vdc-K:
close to the standard value of 300 V to 400 V (100
V to 800 V)
• Grid voltage: Vg-c, Vg-M, Vg-Y, Vg-K: close to the
standard value of 450 V to 550 V (200 V to 1000 V)
There is a positive contact between the electrostatic
charger application terminals and the high voltage unit
connection terminals.
There is a positive contact between the developing bias
application terminals and the high voltage unit
connection terminals (Y: B4; M: B3; C: B2; K: B1).
motor (M6 to M9) and MFP board (CN16E, CN30E).
Select [Service Mode] -> [State Confirmation] ->
History 1] and the measured value is correct.
TCR-C, TCR-M, TCR-Y, TCR-K: normal value 5 to 8 %
Select [Service Mode] -> [Imaging Process Adjustment]
- > [Max Image Density Adj] and make the necessary
adjustment, and the image trouble is eliminated.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Initialize + Image
[Gradation Adjust], and the image trouble is eliminated.
Check item
There is a positive contact between the transfer belt
application terminals and the high voltage unit
connection terminals (Y: T1-4; M: T1-3; C: T1-2; K:
T1-1).
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.
Select [Service Mode] -> [Imaging Process Adjustment]
- > [Max Image Density Adj] and make the necessary
adjustment, and the image trouble is eliminated.
K-314
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
YES
YES
[Table NO
NO
NO
YES
YES
[Level NO
NO
YES
Stabilization] and
NO
Result
NO
NO
NO
Action for the faulty color
Clean the PH window. (bizhub
C368/C308/C258 / bizhub C658/
C558/C458)
Lightly wipe the surface clean of
foreign matter using hydro-wipe
(65AA-99##).
Note: Do not apply a strong force
to the surface of the charging
roller, as doing so can damage
the surface.
• Check the high voltage unit,
developing unit, and the
drum unit for wiring and
connection.
• Replace the high voltage
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
Clean or correct the terminal.
Clean or correct the terminal.
Reconnect the connector.
• Correct.
• Replace the hopper drive
unit. (bizhub C368/C308/
C258 / bizhub C658/C558
bizhub C458)
Select [Service Mode] -> [Imaging
Process Adjustment] -> [Manual
Toner Add] and perform the
function.
Go to the next step.
Readjust.
• Replace the drum unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Replace the developing unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
• Replace the PH unit. (bizhub
C368/C308/C258 / bizhub
C658/C558/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
Clean or correct the terminal.
Clean or correct the terminal.
Go to the next step.
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