Significant Color Misregistration; Color Misregistration Occurs; Thought Reg Adjust Test Of Engine Maintenance Function Results Ok, Color Misregistration Occurs; Solid Black Printing - Oki MC873dn Maintenance Manual

Oki Data CONFIDENTIAL
2.5.6.(6)

Significant color misregistration

(6-1)

Color misregistration occurs.

Check item
(6-1-1) Result of color registration error correction
Color registration Use the self-diagnostic mode and execute the
error correction REG ADJUST TEST. Check the result. Error
time (If a printer is is issued but is not displayed on the ON LINE
normal, it is approx. display.
40 seconds.)
(6-1-2) Toner
Remaining amount Check if the message "Prepare toner
of toner replacement." or "Replace the toner." appears
or not
(6-1-3) Color registration error detection sensor
Sensor is dirty Is toner or paper dust attached to the sensor?
(6-1-4) Color registration error detection sensor shutter
Shutter operation is Check the shutter operation by the self-
faulty diagnostic mode
(6-2) Thought REG ADJUST TEST of engine maintenance function results ok, color
misregistration occurs.
Check item
(6-2-1) Paper feed system
Paper feed system Check if any obstacle exists in the paper
of the paper feeding path, that hampers smooth paper run.
running path
45850101TH Rev.1
Actions to be taken
Check work
at NG
Replace the
sensor that
causes the
error. Clean
the sensor
to remove
stain. Replace
the shutter.
Replace the
CU/PU board.
Replace toner
cartridge with
new one.
Clean the
sensor to
remove stain
Replace the
shutter or tune
the mechanism
Actions to be taken
Check work
at NG
Remove the
obstacle
2.5.6.(7)

Solid black printing.

(7-1)

Solid black printing over the whole page

Check item
(7-1-1) High voltage contacting condition
CH terminal Check that the terminal coming from the
printer body contacts with the high voltage
terminal that is located on the left side of the
ID unit when viewed from the top by visual
inspection.
CH terminal Check that the high voltage terminal keeps
the normal contacting condition on the high
voltage board. Open the left cover and remove
the high voltage board. Then, check that
the terminal is not installed in the abnormal
installation condition.
ID unit terminal Check that the high voltage terminal of the ID
unit is contacting with the Contact Assembly
normally by visual inspection. (Refer to Figure
2-2.)
(7-1-2) High voltage output condition
CH output If high voltage probe is available as a
maintenance tool, open the left cover, and
check the CH output with the high voltage
probe from the soldering side of the high
voltage board. (The high voltage probe is not
an ordinary maintenance tool.)
2. TROUBLESHOOTING PROCEDURES
Actions to be taken
Check work
at NG
Replace the
terminal of
printer side.
Correct the
installation
condition of
the terminal
to the normal
condition.
Replace the ID
unit or replace
the high voltage
board or correct
the high voltage
terminal.
If any attempt
of using new
ID unit as a
trial is going
to be made,
be sure to use
the System
Maintenance
Menu FUSE
KEEP MODE.
Replace the
high voltage
board.
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