44346001TH Rev.1
15 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING
7.5.3 (6) Color misregistration is significant.
(6-1) The message “Adjusting color” displayed at power on stays for a short time.
Check item
Check operation
Actions for NG
results
(6-1-1) Color registration adjustment result
Time of color
registration
adjustment (if it is
normal, correction
takes about 40
seconds)
Execute REG ADJUST TEST in the self-
diagnostic mode and check the result.
Even if an error has occurred, it is not
displayed when ON LINE is displayed.
Replace the
sensor if the
result shows
NG. Clean the
sensor. Replace
the shutter.
Replace the
CU/PU board.
(6-1-2) Toner
Remaining toner
amount
Check the operator panel if it displays “Prepare
to replace the toner cartridge” or “Replace the
toner cartridge.”
Replace an
applicable toner
cartridge with a
new one.
(6-1-3) Color registration sensor
Dirty sensor
Check the sensor if it is dirty with toner or
paper dust.
Wipe them off.
(6-1-4) Color registration sensor shutter
Malfunction of the
shutter
Check shutter operation in the self-diagnostic
mode.
Replace the
shutter or repair
the mechanism.
(6-2) Although the REG ADJUST TEST result of the engine maintenance function is OK,
color misregistration occurs.
Check item
Check operation
Actions for NG
results
(6-2-1) Feeding system
Paper feed state in
the paper feed path
Check the paper feed path if there is
something that blocks the paper in the paper
feed path.
Remove the
blocking object.
(7) Black filled-in printing
(7-1) Printed pages are filled-in black entirely.
Check item
Check operation
Actions for NG
results
(7-1-1) High-voltage terminal contacting state
CH terminal
From above the printer, visually check if the
terminal jutting out the printer contacts the
high-voltage terminal, which is located on the
left side of the ID unit, normally.
Replace the
terminal on the
printer side.
CH terminal
Check if the high-voltage terminal on the high-
voltage board is in a normal contact state.
Open the left-side cover, detach the high-
voltage board, and check if the terminal is
installed improperly.
Remove
and install
the terminal
properly.
ID unit terminal
Visually check each ID unit high-voltage
terminal if it contacts the contact assembly
properly. (See Fig. 7-3.)
Replace any
applicable ID
unit or high-
voltage board,
or correct any
applicable high-
voltage terminal.
When using a
new ID unit as a
try, select FUSE
KEEP MODE
of the system
maintenance
menu.
(7-1-2) High-voltage output state
CH output
If a high-voltage probe is available as a
maintenance tool, open the left-side cover
and check CH output on the soldering side of
the high-voltage board using the high-voltage
probe during printing. (High-voltage probes
are not a general maintenance tool.)
Replace the
high-voltage
board.