Field Service Ver. 1.0 Jun. 2008
19. Image quality problem
343
T
roubleshooting
19.3.21
Printer monocolor: foggy background
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C510DA
ABCD
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Step
Section
Check item
Result
Action
1
Warning display
The maintenance call mark is
displayed on the panel.
YES
Take action according to the
warning code shown on the
state confirm screen.
2
State Confirma-
tion
o
Table
Number
(Service Mode)
Check data for Vg and Vdc.
Color
Vdc: around 400 V
Vg : around 500 V
Black
Vdc: around 400 V
Vg : around 500 V
NO
Go to next step.
3
State Confirma-
tion
o
Level His-
tory 1
(Service Mode)
Check TCR data.
(specified rang: 6 to 8 %)
NO
Go to next step.
4
IDC output value is around 4.3 V.
NO
Clean IDC sensor and execute
the image stabilization.
Check transfer belt for dam-
age and correct as necessary.
5
Level history data
check results
Low TCR and low Vg and Vdc
YES
Go to step 10.
6
Low TCR and high Vg and Vdc
YES
Go to step 12.
7
TCR falling within specified range
and low Vg and Vdc
YES
Go to step 10.
8
TCR falling within specified range
and high Vg and Vdc
YES
Go to step 12.
9
The situations other than the above-
mentioned.
YES
Go to step 10.
10
Imaging unit
Dirty on the outside.
YES
Clean.
11
PH unit
The surface of the PH window is
dirty.
YES
Clean with cleaning jig.
12
Image Process
Adjustment
o
Background Volt-
age Margin
(Service Mode)
The problem is eliminated after
background voltage margin has
been adjusted.
NO
Go to next step.
d
-Color
M
F
201
Y109660-1 Sevice Manual
