Konica Minolta bizhub C658 Service Manual page 1633

bizhub C658/C558/C458/C368/C308/C258
Step Section
4 Photo conductor section
5 Developing section
6 Photo conductor section
7 Photo conductor section
8 Photo conductor section
9 1st transfer section
10 1st transfer section
11 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
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)
Faint lines evident on the entire surface as if the surface
were brushed off.
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-305
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
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)
YES • Select [Service Mode] ->
• Replace the drum unit having
NO Clean or correct the terminal.
YES • Clean.
• Replace the transfer belt unit.
YES Replace the developing unit.
(bizhub C368/C308/C258
C658/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
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
(bizhub
/ bizhub C658/
[Counter] -> [Life] and check
the counter value of the
Drum Unit.
the greatest counter value
with a new one. (bizhub
C368/C308/C258 / bizhub
C658/C558/C458) (Not the
drum unit of the color that
has developed the lines, but
the drum unit having the
greatest counter value)
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
/ bizhub
(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)