44346001TH Rev.1
174 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING
Check item
Check operation
Actions for NG
results
(11-2-2) Temperature increase of fuser unit
Installation position
of the upper
thermistor
Check if the upper thermistor 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.
Remove the heater cover, and check warpage of
sensor by visual inspection.
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.
Installation position
of the lower
thermistor
The lower thermister must be installed while
contacting with the fuser unit. Check if the lower
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.
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.
(11-2-3) AC power input to the halogen lamp
AC power voltage
from the low voltage
power supply
Check if the AC voltage for heater is normally
supplied or not.
Power supply CN2 connector
, between pin-1
and pin-2, and between pin-3 and pin-4.
Replace the low
voltage power
supply.
Heater ON signal
that is output
from PU to the
low voltage power
supply
Check that the heater ON signal goes active at
the warming up timing, or not.
"L" active while ON.
CU/PU board POWER connector-10 pins 14
and 15
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
Check operation
Actions for NG
results
(12-1-1) Cable connection condition and wiring condition
Cable connection
condition and wiring
condition of the
low voltage power
supply fan and
those of the fuser
fan
Check if the connectors are connected normally
or not.
Check if extra length of the cables does not
touch the fan blade or not.
Correct the
connection
condition of
the connectors.
Correct the
cable wiring
route. Replace
the fan.
(12-3) All fans of the printer do not rotate.
Check item
Check operation
Actions for NG
results
(12-3-1) 24V power supply
CU/PU board fuses,
F4 and F5
Check if the fuses F4 and F5 are not open-
circuit or not.
24V power
supplied to the
CU/PU board
24V power supplied
to the CU/PU board
Check the power supply voltages at the
POWER connector
of the PU/CU board.
Pins 7, 8 and 9: 24V
Pins 4, 5 and 6: 0VL
Pins 10, 11 and 12: 0VP
Replace the low
voltage power
supply.