44951501TH Rev.2
7-23
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING
Display
Causes
Error detail
Actions
POWER OFF/ON
901:ERROR
904:ERROR
Belt
temperature
error
901: Short
circuit
902: Open
circuit
903: High
temperature
904: Low
temperature
Is the cable from the belt
thermistor to the CU/PU
board connected properly?
Does the error occur again?
No
Yes
No
Connect the cable
properly.
Turn off and on
the printer.
Replace the belt
thermistor.
POWER OFF/ON
923:ERROR
A lock error
with black
image drum
The image drum does not
revolve properly.
Does the error display is
provided again by turning off
and on the printer?
Yes
Yes
Be sure the image
drum is properly
installed properly.
Replace the
image drum unit.
Replace the
image drum
motor.
POWER OFF/ON
928:ERROR
Fuser motor
lock error
The fuser does not operate
properly?
Does the error occur again?
Yes
Yes
Check that the
fuser is properly
installed.
Replace the fuser.
Replace the fuser
motor.
POWER OFF/ON
933:ERROR
A clock error
correction
error with an
option unit
(which does
not occur with
the printer in
the factory
shipped
configuration)
Does the error occur again?
Does the error occur again?
Yes
Yes
Be sure of
connector
contacts.
Replace the
option unit.
Display
Causes
Error detail
Actions
POWER OFF/ON
933:ERROR
Tray-2
CPU clock
frequency
error
SERVICE CALL
980:ERROR
Media
jamming error
around fuser
Media is jammed by
entangling around the fuser.
Turn off the
printer.
Replace the fuser.
SERVICE CALL
983:ERROR
Duplicate
toner cartridge
detection error
Multiple toner cartridges for
the same color ware detected.
Install toner
cartridges for
specified colors
at the proper
positions.
SERVICE CALL
990:ERROR
Waste toner
sensor
detection
error
Is the K toner cartridge
installed?
Does the error occur again?
No
Yes
Install the K toner
cartridge.
Be sure of cable
connection,
and then
perform board
replacement.
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CRC CHECK NG ( )
PU download
data CRC
check error
A CRC check error was
detected after downloading
of PU data (PU firmware and
custom media data).
Turn off and on
the printer, and
then re-download
it (In general use
of the printer, the
downloading is
not performed
and this error
does not occur).
WDT ERROR
ADR=××××××××
PU firmware
runaway
Does the error occur again?
Yes
Turn off and on
the printer.
Replace the CU/
PU board.
COMMUNICATION
ERROR
PU-CU
interface error
Does the error occur again?
Yes Replace the CU/
PU board.
Note!
With the printer’s temperature not more than 0ºC, Service call errors 188
Error, 171 Error, 175 Error, 903 Error and 904 Error may occur. After turn off
the printer, turn on the printer after the printer warms.