Oki B721 Maintenance Manual page 159

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