Oki B721

Oki Data CONFIDENTIAL
45487001TH Rev.1
6-26 /
6. Troubleshooting procedure
Panel display Cause Check details
Result
Solution
Service Call
166: Error
An abnormality
was detected with
the power supply
temperature
thermistor.
01: Short
02: Open
03: High temp.
04: Low temp.
01, 02:
Does error reoccur?
Does error reoccur?
Does error reoccur?
03:
Does error reoccur?
Does error reoccur?
Does error reoccur?
04:
Does error reoccur?
Does error reoccur?
Does error reoccur?
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Power Off/On.
Replace the low
voltage power
supply unit.
Replace the PU/
CU board.
Replace the cable
between the low
voltage power
supply unit and the
PU/CU board.
Remove anything
obstructing the
ventilation slots if
any and restore
the power.
Replace the low
voltage power
supply unit.
Replace the PU/
CU board.
Replace the cable
between the low
voltage power
supply unit and the
PU/CU board.
Raise the room
temperature and
restore the power.
Replace the low
voltage power
supply unit.
Replace the PU/
CU board.
Replace the cable
between the low
voltage power
supply unit and the
PU/CU board.
Panel display Cause Check details
Result
Solution
Service Call
167: Error
ThermistorSlope
Error
Is the error message
displayed?
Does error reoccur?
Ye s
Ye s
Power Off/On.
After leaving the
printer for 30
minutes, turn on
the printer again.
Service Call
168: Error
Compensation
Thermistor Error
01: Short
02: Open
03: High temp.
04: Low temp.
Is the error message
displayed?
Does error reoccur?
Ye s
Ye s
Power Off/On.
After leaving the
printer for 30
minutes, turn on
the printer again.
Service Call
169: Error
Upper Side
Thermistor Error
01: Short
02: Open
03: High temp.
04: Low temp.
Is the error message
displayed?
Does error reoccur?
Ye s
Ye s
Power Off/On.
After leaving the
printer for 30
minutes, turn on
the printer again.
Service Call
170: Error, 171:
Error
Short circuit in fuser
thermistor or open
detected.
Does error reoccur? Ye s
Power Off/On.
Replace the fuser
unit.
Service Call
172: Error, 173:
Error
Abnormal
temperature
detected by fuser
thermistor
(high-temp or low
temp.)
Does error reoccur? Ye s
Power Off/On.
Replace the fuser
unit.
Service Call
182: Error to 184:
Error
Option unit I/F
error
182=Tray2
183=Tray3
184=Tray4
Does error reoccur? Ye s
Power Off/On.
After checking
connention parts of
connector,replace
option unit.
Power Off/On
190: Error
System Memory
Overflow. Does error reoccur? Ye s
Power Off/On.
Add option RAM
DIMM.
Service call
200: Error to 202:
Error
PU Firmware
download Error.
(These problems
are not occurred in
the usual operating.)
Error occured while
writing over the PU
firmware.
Turn the printer
OFF/ON, and retry
to download the PU
firmware again.