44346001TH Rev.1
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Oki Data CONFIDENTIAL
7. TROUBLESHOOTING
Display
Causes
Error detail
Actions
POWER OFF/ON
933:ERROR
Tray-2
CPU clock
frequency
error
SERVICE CALL
980:ERROR
Duplicate
toner
cartridge
detection
error
Multiple toner cartridges for
the same color ware detected.
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.