Konica Minolta bizhub C658 Service Manual page 1636

bizhub C658/C558/C458/C368/C308/C258
(3) 1-color troubleshooting procedure
Step Section
1 Service Mode -> Table
Number
2 Write section
3 Charging section
4 Photo conductor section
5 Developing section
6 Photo conductor section
7 Photo conductor section
8 1st transfer section
9 1st transfer section
10 Developing section
(4) 4-color troubleshooting procedure
Step Section
1 Paper path
2 Transfer belt unit
3 Transfer belt unit
4 Transfer belt unit
5 2nd transfer section
Check item for the faulty color
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)
Sharp white line or colored line is blurry.
Foreign matter on charging roller.
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).
Scratches on photo conductor.
Toner line or dirt on photo conductor. (improper
cleaning)
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).
Scratches or dirt on 1st transfer roller.
Toner bristles not even on the developing roller,
resulting in a line or band.
Check item
There is dirty or foreign matter on paper path.
Lines that can be removed by cleaning are evident on
the transfer belt. (improper cleaning)
Dirt, scratches, or foreign matter on the transfer belt.
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).
Dirt or foreign matter on the 2nd transfer roller.
K-308
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
[Table NO • Check the high voltage unit,
• Replace the high voltage
YES Clean the PH window.
C368/C308/C258
C558/C458)
YES 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.
NO Clean or correct the terminal.
NO Clean or correct the terminal.
YES • Clean.
• Replace the drum unit.
YES Replace the drum unit.
C368/C308/C258
C558/C458)
NO Clean or correct the terminal.
YES • Clean.
• Replace the transfer belt unit.
YES Replace developing unit.
C368/C308/C258
C558/C458)
NO Replace the PH unit.
C368/C308/C258
C558/C458)
Result
YES Check or clean the paper path
including the duplex section.
YES • Check or clean the cleaning
• Replace the transfer belt unit.
YES • Clean.
• Replace the transfer belt unit.
NO Clean or correct the terminal.
YES • Remove the foreign matter.
• Replace the transfer roller
Action for the faulty color
developing unit, and the
drum unit for wiring and
connection.
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
(bizhub
/ bizhub C658/
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
(bizhub
/ bizhub C658/
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
(bizhub
/ bizhub C658/
(bizhub
/ bizhub C658/
Action
blade.
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)