Oki MC770 series Maintenance Manual - page 156
45376001TH Rev.1
155 /
Oki Data CONFIDENTIAL
7. Troubleshooting and repair procedure
Error code
Cause
Error details
Remedial measure
C3EA~
C3ED
The ID unit
fuse has
blown out.
(C3EA=Y,
C3EB=M,
C3EC=C,
C3ED=K)
Is the ID unit installed normally?
Does this error recur?
Does the printer recover from
the error when the PU/PRZ
board is replaced?
No
Yes
Yes
No
Re-install the ID unit.
Turn on the power
again.
After checking
for the sure
connection of the
cable between
PRZ board and PU
board, replace the
PRZ board.
Replace the PU
board.
C3E2
The fuse has
blown out.
Is the belt unit connected
normally?
Does this error recur?
No
Yes
Yes
Re-install the belt
unit.
Turn on the power
again.
After checking
for the sure cable
connection,
replace the PU or
Board IBY.
C4C0
The fuse has
blown out.
Is the fuser unit installed
normally?
Does this error recur?
No
Yes
Yes
After cleaning
the connecting
connector of the
fuser unit, re-install
the fuser unit.
Turn on the power
again.
After checking
for the sure cable
connection,
replace the PU or
Board IBY.
C3B3~
C383
Toner sensor
detection
error.
(C3B3=Y,
C3A3=M,
C393=C,
C383=K) This
error does
not occur with
the default
settings.
Is the toner cartridge installed?
Is the lock lever of the toner
set?
Does this error recur?
No
No
Yes
Install the toner
cartridge.
Rotate the lock
lever of toner to the
lock position.
Turn on the power
again.
Replace the toner
sensor assembly.
C44A
Thermistor
Slope Error
Is the error message displayed?
Does this error recur?
Yes
Turn on the power
again.
After leaving a
printer for 30
minutes, turn on
the power again.
Error code
Cause
Error details
Remedial measure
C41E
Compensation
Thermistor
Error
Is the error message displayed?
Does this error recur?
Yes
Turn on the power
again.
After leaving a
printer for 30
minutes, turn on
the power again.
C41A
C41B
Short-circuit
or open-
circuit of fuser
thermistor is
detected.
Does this error recur?
Yes
Turn on the power
again.
Replace the fuser
unit.
C449
C446
The fuser
thermistor
has detected
an abnormal
temperature
(high
temperature
or low
temperature.)
Does this error recur?
Does this error recur?
Yes
Yes
Turn on the power
again.
Replace the fuser
unit.
Replace the low
voltage power
supply unit.
C41C
The backup
roller
thermistor is
detected of its
short-circuit.
(At high
temperature)
Does this error recur?
Yes
Turn on the power
again.
Replace the fuser
unit.
C41D
The backup
roller
thermistor
is detected
of its open-
circuit. (At low
temperature)
Does this error recur?
Yes
Turn on the power
again.
Replace the fuser
unit.
C468
C466
The backup
roller
thermistor
has detected
an abnormal
temperature
(high
temperature
or low
temperature.)
Does this error recur?
Does this error recur?
Yes
Yes
Turn on the power
again.
Replace the fuser
unit.
Replace the low
voltage power
supply unit.