Konica Minolta bizhub C658 Service Manual page 1656

bizhub C658/C558/C458/C368/C308/C258
Step Section
5 Developing section
6 Connector connection
7 Write section
8 Service Mode -> Self-
diagnostic
(4) Scanner troubleshooting procedure
Step Section
1 Black copy: Scanner
section
2
3 • When original glass
is being used
• When DF is being
used: 1st side
4 • When original glass
is being used
• When DF is being
used: 1st side
• When DF-629 is
being used: 2nd side
5 • When original glass
is being used
• When DF is being
used: 1st side
• When DF-629 is
being used: 2nd side
6 DF-704 or dual scan
document feeder is being
used: 2nd side
Check item
With the color of toner responsible for the abnormal
image, 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).
bizhub C368/C308/C258:
Faulty connector connection the high voltage unit (CN1,
CN2) and MFP board (CN22E, CN36E).
bizhub C658/C558/C458:
Faulty connector connection the high voltage unit (CN1,
CN2) and MFP board (CN30E, CN33E).
bizhub C368/C308/C258:
Faulty connector connection the MFP board (CN18)
and PH relay board (CN1, CN2).
bizhub C658/C558/C458:
Faulty connector connection the MFP board (CN6) and
PH relay board (CN1, CN2).
Select [Service Mode] -> [State Confirmation] -> [Self-
diagnostic] -> [Check All] and perform the function.
Then, "NG" appears.
Check item
Foreign matter on scanner rails.
Faulty the drive shaft and pulley shaft.
Scanner moves smoothly.
None of the terminal pins of the connection cable
between the CCD board (CN3 or PJ3) and the MFP
board (CN1) is bent and a positive connection is made.
Replace the connection cable between the machine
and the DF. This eliminates the trouble.
Select [Service Mode] -> [State Confirmation] -> [Self-
diagnostic] -> [Check All] and perform the function.
Then, "NG" appears.
bizhub C368/C308/C258:
Faulty connector connection the CIS power supply unit
(J1), relay connector (P6), main body connection
section (P1) and DC power supply (CN4).
bizhub C658/C558/C458:
K-328
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO Clean or correct the terminal.
YES Reconnect the connector.
YES Reconnect the connector.
YES Take relevant action
corresponding to the check item in
which "NG" has appeared.
NO • Replace the high voltage
• Replace the MFP board.
• Replace the PH unit.
Result
YES Clean and apply lubricant. *1 *2
NO • Adjust the scanner motor
• Replace the scanner motor.
• Replace the scanner drive
NO Reconnect the connector.
YES Replace the connection cable.
YES Take relevant action
corresponding to the check item in
which "NG" has appeared.
NO • Replace the CCD unit.
• Replace the MFP board.
YES Reconnect the connector.
Action
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
(bizhub
C368/C308/C258 / bizhub
C658/C558/C458)
Action
drive belt. (bizhub C368/
C308/C258 / bizhub C658/
C558/C458)
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
board. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)
(bizhub C368/C308/C258 /
bizhub C658/C558/C458)