Printer Monocolor: Foggy Background - Konica Minolta bizhub C353P Service Manual

Field Service Ver. 1.0 Oct. 2007
22.3.7

Printer monocolor: foggy background

A. Typical faulty images
B. Troubleshooting procedure
Step Section
Warning display
1
State Confirma-
tion → Table
2 Number
(Service Mode)
State Confirma-
3
tion → Level
History1
(Service Mode)
4
5 Level history data
check results
6
7
8
9
10 Imaging unit
PH unit
11
Image Process
Adjustment →
12 Background Volt-
age Margin
(Service Mode)
ABCD
ABCD
ABCD
ABCD
ABCD
Check item
The warning code is displayed on
the panel.
Check data for Vg and Vdc.
Color Vdc: around 400 V
Vg : around 500 V
Black Vdc: around 400 V
Vg : around 500 V
Check TCR data.
(specified rang: 6 to 8 %)
IDC output value is around 4.3 V.
Low TCR and low Vg and Vdc
Low TCR and high Vg and Vdc
TCR falling within specified range
and low Vg and Vdc
TCR falling within specified range
and high Vg and Vdc
The situations other than the above-
mentioned.
Dirty on the outside.
The surface of the PH window is
dirty.
The problem is eliminated after
background voltage margin has
been adjusted.
22. Image quality problem
A02EF4C510DA
Result Action
YES Take action according to the
warning code shown on the
state confirm screen.
NO Go to next step.
NO Go to next step.
NO Clean IDC sensor and execute
the image stabilization.
Check transfer belt for dam-
age and correct as necessary.
YES Go to step 10.
YES Go to step 12.
YES Go to step 10.
YES Go to step 12.
YES Go to step 10.
YES Clean.
YES Clean with cleaning jig.
NO Go to next step.
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