Olivetti d-color MF651, Service Manual, Page: 944 / 1053

22. IMAGE QUALITY PROBLEM Field Service Ver. 2.0 Jul. 2009
884
TROUBLESHOOTING
22.3.21 Printer monocolor: foggy background
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C510DA
ABCD
ABCD
ABCD
ABCD
ABCD
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 image transfer belt for
damage and correct as neces-
sary.
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.
Service Manual Y110571-1