Oki B721 Maintenance Manual page 158

Oki Data CONFIDENTIAL
Panel display Cause
Service Call High-voltage power
121: Error supply I/F error.
Service Call Low-voltage power
122: Error supply FAN error.
Low-voltage power
supply temperature
error.
Service Call Abnormal
123: Error environment humidty
/Not connected
humidity sensor.
Service Call Abnormal
124: Error environment
temperature.
Power Off/On Condensation in
126: Error the printer was
detected.
Service Call Error detected at the
127: Error fuser unit cooling
FAN.
45487001TH Rev.1
Check details Solution
Result
Is cable between PU No Connect properly.
board and high-voltage Yes Check improper
power unit connected connections for
properly? high-voltage.
Is there no improperly No Replace the hige-
connections? voltage power
supply.
Is the FAN (bottom No Check connections
right of the front) of for connector of
the low voltage power the FAN.
supply block working? Yes Replace the low-
voltage power
supply.
Is the FAN connector No Replace the FAN.
connected correctly? Yes Replace the low-
voltage power
supply.
Power Off/On.
Does error reoccur? Yes Replace the control
panel board (PCQ
board).
Power Off/On.
Does error reoccur? Yes Replace the control
panel board (PCQ
board).
Condensation iss likely After leaving the
to occur in printers printer at room
carried from the outside. temperature, turn
Turn on the printer on the power
again after it is exposed again.
to room temperature for
two hours to half a day.
Does the error reoccur? Yes Replace the control
panel board (PCQ
board).
Is the FAN connector No Connect properly
connected properly? again.
Yes Replace the FAN
motor.
Does error reoccur? Yes Replace the PU/
CU board.
Panel display Cause
Service Call Error detected at the
128: Error engine FAN motors.
05: Fuser side FAN
08: REAR FAN
0B: ID FAN 2
Service Call LED head fault
134: Error detected.
(134=K)
Service Call Fuser unit
155: Error fuse cannot be
disconnected.
Service call Error detected
163: Error by toner sensor.
(163=K)
This error does
not occur with the
factory default
settings.
6. Troubleshooting procedure
Check details Solution
Result
Is the FAN connector No Connect properly
connected properly? again.
Yes Replace the FAN
motor.
Does error reoccur? Yes Replace the PU/
CU board.
Is LED head properly No Set properly for
set? LED head unit.
Yes Turn power ON
agein.
Does error reoccur? Yes Replace LED head
unit
Is fuser unit set No After cleaning for
properly? fuser connector,
reset.
Yes Turn power ON
again.
Does error reoccur? Yes Replace the PU/
CU board.
Is toner cartridge No Set toner cartridge.
setting?
Is toner lock lever No Turn a lock lever
setting? of toner to a fixed
Does error reoccur? position.
Yes Replace toner
sensor or
assembly.
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