44346001TH Rev.1
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Oki Data CONFIDENTIAL
7. TROUBLESHOOTING
Display
Causes
Error detail
Actions
POWER OFF/ON
074:ERROR
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075:ERROR
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Video error.
An error was
detected in
expanding
image data.
Is the CU/PU installed
properly?
No
Yes
Reinstall it
properly.
Replace it.
SERVICE CALL
081:ERROR
Parameter
matching
check error
Reading from or writing into
EEPROM or flash memory
cannot be made properly.
Turn off and
on the printer.
Replace the CU/
PU board when
the symptom
persists.
SERVICE CALL
104:ERROR
An engine
EEPROM
read/write
error was
detected.
Does the error occur again?
Yes
Turn off and on the
printer
Replace the CU/
PU board.
SERVICE CALL
106:ERROR
Engine
control logic
error
Does the error occur again?
Yes
Turn off and on the
printer
Replace the CU/
PU board.
SERVICE CALL
112:ERROR
The 2nd tray
for a model
different from
the printer
was detected.
Is the 2nd tray for the printer
installed?
No Install proper 2nd
tray.
SERVICE CALL
121:ERROR
High-voltage
power supply
interface error
Is the cable between the CU/
PU board and the high-voltage
power unit connected properly?
Is a contact faulty?
No
Yes
No
Reconnect it
properly.
Check the high-
voltage line for no
poor connection.
Replace the high-
voltage power
supply.
Display
Causes
Error detail
Actions
SERVICE CALL
122:ERROR
Rear-fan error Does the fan at the rear of the
printer operate?
Is the connector of the fan
connected properly?
No
Yes
No
Yes
Be sure of the
connection of the
fan.
Replace the CU/
PU board.
Connect the fan
properly.
Replace the CU/
PU board.
SERVICE CALL
123:ERROR
Ambient
humidity
error or non
connection
of humidity
sensor
Is the cable from the CU/PU
board to the toner sensor board
connected properly?
No
Yes
Re-connect it
properly.
Replace the toner
sensor board.
SERVICE CALL
124:ERROR
Ambient
temperature
error
Is the cable from the CU/PU
board to the toner sensor board
connected properly?
No
Yes
Re-connect it
properly.
Replace the toner
sensor board.
SERVICE CALL
128:ERROR-05
Image drum
fan error
Is the connector of the fan
connected properly?
Does the error occur again?
No
Yes
No
Re-connect it
properly.
Replace the fan
motor.
Replace the CU/
PU board.
SERVICE CALL
128:ERROR-08
Front fan
error
Is the connector of the fan
connected properly?
Does the error occur again?
No
Yes
No
Re-connect it
properly.
Replace the fan
motor.
Replace the CU/
PU board.