Troubleshooting The Abnormal Images - Oki MC760 Maintenance Manual

Oki Data CONFIDENTIAL

7.5.5 Troubleshooting the abnormal images

(1) Color has faded-out and blurred entirely. (Refer to Figure 7-2A.) .......................194
(1-1) Color are faded-out and blurred. ..............................................................194
(2) Stain on white print (Refer to Figure 7-2B.) ........................................................195
(2-1) Stain on white print (Partial stain) .............................................................195
(2-2) Stain on white print (overall stain) .............................................................195
(3) White print (Refer to Figure 7-2C.) ......................................................................196
(3-1) White print over entire page ......................................................................196
(4) Black banding/black streaking in vertical direction ..............................................197
(4-1) Thin vertical line (with color) (Refer to Figure 7-2D.) ................................197
(4-2) Thin vertical line (without color) (Refer to Figure 7-2F.) ..........................197
(5) Cyclic abnormality (Refer to Figure 7-2E.) .........................................................197
(5-1) Cyclic abnormality occurs in vertical direction .........................................197
(6) Heavy color registration error ..............................................................................198
(6-1) Display of the message "Color adjustment is in progress" appears
only short time. .........................................................................................198
(6-2) Though REG ADJUST TEST of engine maintenance function is ok,
color blur occurs .......................................................................................198
(7) Entirely black print ...............................................................................................198
(7-1) All black print over entire page ..................................................................198
Note! When an attempt is going to be made to replace the PU board, read data
contents of the EEPROM chip from the old PU board beforehand, and copy
the data contents into the new board after the new PU board is installed.
45376001TH Rev.1
A
Overall faded-out B Stain on white print
Blurred
D E
Black banding/ Cyclic abnormality
black streaking
in vertical direction
Figure 7-2
7. Troubleshooting and repair procedure
C Entirely white
F
White banding/
white streaking
in vertical direction
193 /