Konica Minolta bizhub C658 Service Manual page 1650

bizhub C658/C558/C458/C368/C308/C258
Step Section
7 Service Mode -> Primary
transfer adj.
8 Service Mode -> 2nd
transfer adj.
9 Enhanced Security ->
Engine FW Dip SW
10 Service Mode -> TCR
Level
11 Image check
(3) 1-color troubleshooting procedure
Step Section
1 Write section
2 Charging section
3 Photo conductor section
4 Photo conductor section
5 Developing section
6 1st transfer section
7 Connector connection
Check item
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Transfer Voltage Fine Adj] ->
and the image trouble is eliminated.
* Decrease the setting value for white dots.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Transfer Voltage Fine Adj] ->
the image trouble is eliminated.
* Increase or decrease the setting value to find a
specific value at which the trouble is eliminated.
Select [Service Mode] -> [Enhanced Security] ->
[Engine FW Dip SW] -> [No. 8], set OFF, perform [2nd
Transfer Adj.] again, and the image trouble is
eliminated.
* Increase or decrease the setting value to find a
specific value at which the trouble is eliminated.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [TCR level] and set the adjustment value of all colors
to "+3".
Next, select [Service Mode] -> [Imaging Process
Adjustment] -> [Manual Toner Add], select all colors,
and press the start key. (This starts a toner replenishing
sequence.)
Then, select [Service Mode] -> [Imaging Process
Adjustment] -> [Stabilizer] -> [Initialize + Image
Stabilization] and perform the function.
Then, select [Service Mode] -> [Imaging Process
Adjustment] -> [Transfer Voltage Fine Adj.] -> [2nd
Transfer Adj.], perform the function, and the image
trouble is eliminated.
* Increase or decrease the setting value to find a
specific value at which the trouble is eliminated.
• Select [Service Mode] -> [Test Mode] ->
Pattern]. Select "SINGLE", "HYPER", "Gradation",
"1-Sided", "CMYK", and "Full Bleed", enter "64" for
Density, and load tray 2 with A3 paper. Press the
start key. This runs a print cycle for C, M, Y, and K
in that order.
• If the abnormal image does not recur, change
Density to "255" and make a print check.
• Check the image after printing and the abnormal
image occurs only with one color.
Check item for the faulty color
Dirt or foreign matter on the dust-proof glass of the PH.
Foreign matter on charging roller.
Dirt, scratches, or foreign matter on the photo
conductor.
There is a positive contact between the electrostatic
charger application terminals and the high voltage unit
connection terminals.
Toner bristles not even on the developing roller,
resulting in a void area.
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).
bizhub C368/C308/C258:
K-322
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
NO
[Primary transfer adj.]
NO
[2nd Transfer Adj.] and
NO
NO
[Halftone YES
NO
Result
YES
YES
YES
NO
YES
NO
YES
Action
Return the setting value to the
original one and go to the next
step.
Return the setting value to the
original one and go to the next
step.
Return the setting value to the
original one and go to the next
step.
Return the setting value to the
original one and go to the next
step.
Go to the 1-color troubleshooting
procedure.
Go to the 4-color troubleshooting
procedure.
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.
• Clean.
• Replace the drum unit.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Clean or correct the terminal.
Replace the developing unit.
(bizhub C368/C308/C258 / bizhub
C658/C558/C458)
Clean or correct the terminal.
Reconnect the connector.
/