44205301TH Rev.1
181 /
Oki Data CONFIDENTIAL
7. Troubleshooting and repair procedure
7.5.3 Troubleshooting the abnormal images
A Overall faded-out
Blurred
B
Stain on white print
C
Entirely white
D
Black banding/
black streaking
in vertical direction
E
Cyclic abnormality
F
White banding/
white streaking
in vertical direction
Figure 7-2
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.
(1)
Color has faded-out and b
lurred entirely. (Refer to Figure 7-2A.) .......................181
(1-1) Color are faded-out and b
lurred. ..............................................................181
(2) Stain on white print (Ref
er to Figure 7-2B.) ........................................................182
(2-1) Stain on white print (P
artial stain) .............................................................182
(2-2) Stain on white print (o
verall stain) .............................................................182
(3) White print (Ref
er to Figure 7-2C.) ......................................................................183
(3-1) White print o
ver entire page ......................................................................183
(4) Black banding/b
lack streaking in vertical direction ..............................................184
(4-1) Thin ver
tical line (with color) (Refer to Figure 7-2D.) ................................184
(4-2) Thin ver
tical line (without color) (Refer to Figure 7-2F.) ..........................184
(5) Cyclic abnormality (Ref
er to Figure 7-2E.) .........................................................184
(5-1) Cyclic abnormality occurs in v
ertical direction .........................................184
(6) Heavy color registr
ation error ..............................................................................185
(6-1) Display of the message "Color adjustment is in prog
ress" appears
only short time. .........................................................................................
185
(6-2) Though REG ADJUST TEST of engine maintenance function is ok,
color blur occurs .......................................................................................
185
(7) Entirely blac
k print ...............................................................................................185
(7-1) All blac
k print over entire page ..................................................................185
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