44952001TH Rev.2
7-47
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURES
Display Cause Error details Measure
Power OFF/ON
Error : 814
SU FW
Removed
It is an error to notify that SU
FW was erased by special
key operation from a panel.
Power OFF/ON
Error : 890
SU System
Memory
Overflow
Doestheerroroccuragain? Yes Turn off and on the
M F P.
Replace the SU board
Power OFF/ON
Error : 899
CU Disconnect In the situation that
communication between
CU and SU was able to
establish, SU FW detected
that CU FW had disappeared
from a communications path
(an USB line).
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
boardconnectedproperly?
Doestheerroroccuragain?
No
Yes
No
Connect the cable
properly.
Turn off and on the
M F P.
Replace the belt
thermistor.
Power OFF/ON
918 : Error
An alarm of
Duplex Fan was
detected.
An error of a fan inside the
Duplex.
Is it reproduced by turning on
thepowerunit?
Yes
Yes
Review whether or not
the Duplex is installed
properly.
Review whether or
not the fan is installed
properly.
Replace the fan.
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
andontheMFP?
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?
Doestheerroroccuragain?
Yes
Yes
Check that the fuser is
properly installed.
Replace the fuser.
Replace the fuser
motor.
Display Cause Error details Measure
Power OFF/ON
933 : Error
Tray-2
CPU clock
frequency
error
Power OFF/ON
941 : Error
942 : Error
943 : Error
944 : Error
PU Error A PU error was detected. Turn off and on the
M F P.
When this error occurs
again, replace the CU/
PU board.
941 : Watch Doc Timer Error
942 : Detection of Unassigned
Interruption
943 : CPU Error Detection
944 : Dcon Access Error
Inspection is
required.
980 : Error
Mediajamming
error around
fuser.
Mediaisjammedby
entangling around the fuser.
Turn off the MFP.
Replace the fuser.
Inspection is
required.
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.
Inspection is
required.
990 : Error
Waste toner
sensor
detection error
Is the K toner cartridge
installed?
Doestheerroroccuragain?
No
Yes
Install the K toner
cartridge.
Be sure of cable
connection, and
then perform board
replacement.
Inspection is
required.
991:Error
TAG Color
Information
Error
A tag of unsettled color
information was detected.
Note! With the MFP’s temperature not more than 0ºC, Service call errors 168
Error, 171 Error, 175 Error, 903 Error and 904 Error may occur. After turn off
the MFP, turn on the MFP after the MFP warms.
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