Oki Data CONFIDENTIAL
43967002TH Rev. 1
313 /
7. Troubleshooting
Display
Cause
Error details
Measure
Ask for inspection
by Oki Data.
155: Fatal Error
Fuser unit
fuse is
blown.
Is the fuser unit installed
normally ?
Does the error recurr?
No
Yes
Yes
After cleaning the
connectors of the Fuser
unit, re-install it. Turn
OFF the power once
and back ON.
After checking the cable
connection, replace the
PU PCB.
Ask for inspection
by Oki Data.
160: Fatal Error
:
163: Fatal Error
Toner
sensor
detection is
defective.
(160= Y, 161
= M, 162 =
C, 163= K).
It does not
occur with
the default
setup.
Is the toner cartridge
installed?
Is the toner lock lever set?
Does the error recurr?
No
No
Yes
Rotate the toner lock
lever that fixes the toner
cartridge to the locking
position.
Turn OFF the power
once and back ON.
Replace the toner
sensor Assy.
Ask for inspection
by Oki Data.
167: Fatal Error
Thermistor
Slope Error
Is the error message
displayed?
Does the error recurr?
Yes
Turn OFF the power
once and back ON.
After leaving the MFP
for 30 minutes, turn
OFF the power once
and back ON.
Ask for inspection
by Oki Data.
168: Fatal Error *
Compensa-
tion
Thermistor
Error
Is the error message
displayed?.
Does the error recurr?
Yes
Turn OFF the power
once and back ON.
After leaving the MFP
for 30 minutes, turn
OFF the power once
and back ON.
Ask for inspection
by Oki Data.
169: Fatal Error *
Upper Side
Thermistor
Does the error recurr?
Yes
Turn OFF the power
once and back ON.
After leaving the MFP
for 30 minutes, turn
OFF the power once
and back ON.
Display
Cause
Error details
Measure
Ask for inspection
by Oki Data.
170: Fatal Error
171: Fatal Error
Short-circuit
or open-
circuit of the
Fuser unit
thermistor is
detected.
Does the error recurr?
Yes
Turn OFF the power
once and back ON.
Fuser unit replacement
Ask for inspection
by Oki Data.
172: Fatal Error
173: Fatal Error
Fuser unit
thermistor
detected
abnormal
temper-
ature. (High
or low tem-
perature)
Does the error recurr?
Does the error recurr?
Yes
Yes
Turn OFF the power
once and back ON.
Replace the fuser unit.
Low voltage power
supply replacement
Ask for inspection
by Oki Data.
174: Fatal Error
Short-circuit
of backup
roller
thermistor is
detected. (At
high tem-
perature)
Does the error recurr?
Yes
Turn OFF the power
once and back ON.
Replace the fuser unit.
Ask for inspection
by Oki Data.
175: Fatal Error
Open-circuit
of backup
roller
thermistor
is detected.
(At low tem-
perature)
Does the error recurr?
Yes
Turn OFF the power
once and back ON.
Replace the fuser unit.
Ask for inspection
by Oki Data.
176: Fatal Error
177: Fatal Error
Abnormal
tempera-
ture of
backup
roller
thermistor
is detected.
(High or
low tem-
perature)
Does the error recurr?
Does the error recurr?
Yes
Yes
Turn OFF the power
once and back ON.
Replace the fuser unit.
Low voltage power
supply replacement