Field Service Ver. 2.0 Mar. 2006
25. Image quality problem
353
bizhub C250P
T
roubleshooting
25.3.7
Printer Monocolor: foggy background
A. Typical Faulty Images
B. Troubleshooting Procedure
4036fs4030c0
ABCD
ABCD
ABCD
ABCD
ABCD
Step
Section
Check Item
Result
Action
1
State Confirmation
→
Table Number
(Service Mode)
Check data for Vg and Vb.
Color
Vdc: Around 400 V
Vg : Around 500 V
Black
Vdc: Around 400 V
Vg : Around 500 V
NO
Go to next step.
2
State Confirmation
→
Level History 1
(Service Mode)
Check TCR data.
NO
Go to next step.
3
IDC output value is around 4.3 V.
NO
Clean IDC Sensor.
Check Transfer Belt for
damage.
4
Level History data
check results
Low TCR and low Vg and Vdc
YES
Go to step 8.
5
Low TCR and high Vg and Vdc
YES
Go to step 11.
6
TCR falling within specified range
and low Vg and Vdc
YES
Go to step 8.
7
TCR falling within specified range
and high Vg and Vdc
YES
Go to step 11.
8
Imaging Unit
Dirty on the outside.
YES
Clean.
9
PH Unit
The surface of the PH Window is
dirty.
YES
Clean with cleaning jig.
10
TCR Sensor window
The color TCR Sensor window is
dirty.
YES
Clean.
11
Image Process
Adjustment
→
Back-
ground Voltage Margin
(Service Mode)
The problem is eliminated after
Background Voltage Margin has
been adjusted.
NO
Go to next step.
12
Image Process
Adjustment
→
X-Rite
Calibration (Grada-
tion Adjust)
(Service Mode)
“Conv. Value” falls within the speci-
fied range as checked through Gra-
dation Adjust.
Max: 0 ± 100
Highlight = 0 ± 60
YES
Go to step 15.
13
Image Process
Adjustment
→
D Max
Density
(Service Mode)
The problem has been eliminated
through the adjust of D Max.
NO
Go to next step.
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