Motor Fan Error (Error Code 122, 127, 128, 918, 051); The Low Voltage Power Supply Fan Does Not Rotate Immediately After The Power Is Turned On; All Fans Of The Printer Do Not Rotate - Oki C310dn Maintenance Manual

Oki Data CONFIDENTIAL
Check item
(11-2-2) Temperature increase of fuser unit
Installation position Check if the upper thermistor is installed in the
of the upper far position from the specified position or not
thermistor causing detection of the lower temperature than
the actual temperature of fuser unit.
Remove the heater cover, and check warpage of
sensor by visual inspection.
Installation position The lower thermister must be installed while
of the lower contacting with the fuser unit. Check if the lower
thermistor thermister is installed in the far position from the
specified position or not causing detection of the
lower temperature than the actual temperature
of fuser unit.
(11-2-3) AC power input to the halogen lamp
AC power voltage Check if the AC voltage for heater is normally
from the low voltage supplied or not.
Power supply CN2 connector
power supply
and pin-2, and between pin-3 and pin-4.
Heater ON signal Check that the heater ON signal goes active at
that is output the warming up timing, or not.
from PU to the "L" active while ON.
low voltage power
CU/PU board POWER connector-10 pins 14
supply
and 15
44346001TH Rev.1
Check operation Actions for NG
results
Replace the
fuser unit.
If any attempt
of using new
fuser unit as
a trial is going
to be made,
be sure to use
the System
Maintenance
Menu FUSE
KEEP MODE.
Replace the
fuser unit.
If any attempt
of using new
fuser unit as
a trial is going
to be made,
be sure to use
the System
Maintenance
Menu FUSE
KEEP MODE.
Replace the low
voltage power
, between pin-1
supply.
Replace the
CU/PU board.
7.5.2. (12) Motor fan error (error code 122, 128)
(12-1) The low voltage power supply fan does not rotate immediately after the power is
turned on.
Check item
(12-1-1) Cable connection condition and wiring condition
Cable connection Check if the connectors are connected normally
condition and wiring or not.
condition of the Check if extra length of the cables does not
low voltage power touch the fan blade or not.
supply fan and
those of the fuser
fan

(12-3) All fans of the printer do not rotate.

Check item
(12-3-1) 24V power supply
CU/PU board fuses, Check if the fuses F4 and F5 are not open-
circuit or not.
F4 and F5
24V power supplied Check the power supply voltages at the
to the CU/PU board POWER connector
Pins 7, 8 and 9: 24V
Pins 4, 5 and 6: 0VL
Pins 10, 11 and 12: 0VP
7. TROUBLESHOOTING
Check operation Actions for NG
results
Correct the
connection
condition of
the connectors.
Correct the
cable wiring
route. Replace
the fan.
Check operation Actions for NG
results
24V power
supplied to the
CU/PU board
Replace the low
voltage power
of the PU/CU board.
supply.
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