Oki C821 Maintenance Manual

44015503TH Rev. 1
178 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURE
Display Cause Error details Remedial measure
Contact the Service
center.
257: Error
Disk Security
Mode Error
Yes
Turn the power OFF/ON.
Execute the re-formation
of hard disk. If it still does
not improve the situation,
change the hard disk.
Reboot the printer.
901: error
~
904: error
Note)
Abnormal
temperature of
belt
901:
Shortcircuit
902: Open
circuit
903: High
temperature
904: Low
temperature
Is the cable from belt thermistor
to the high voltage board
connected normally?
Does this error recur?
No
Yes
No
Re-connect the cables
normally.
Turn on the power again.
Replace the belt
thermistsor.
Reboot the printer.
918: error
Duplex
FAN Alarm
Detection
Fan error inside the duplex unit.
Does the error recur when the
power is turned off once and
back on?
Does the error recur when the
power is turned off once and
back on?
Yes
Yes
Check if the Duplex unit is
installed normally or not.
Check if the fans are
installed normally or not.
Replace the fan.
Reboot the printer.
923: error
Black image
drum lock error
The K ID does not rotate
normally.
Does the error display recur
when the power is turned off
once and back on?
Yes
Yes
Check if the KID is
installed normally or not.
Replace the K ID unit.
Replace the K ID motor.
Reboot the printer.
928: Error
Fuser motor
lock error
Fuser does not rotate normally.
Does this error recur?
Does this error recur?
Yes
Yes
Check if the fuser is
installed normally or not.
Replace the fuser.
Replace the fuser motor.
Contact the Service
center.
980: error
Media
wrapped
around the
fuser error
Media has wrapped around the
fuser.
Turn off the power.
Replace the fuser.
Contact the Service
center.
983: error
Error due to
Detection
of the Toner
cartridges of
the same color
Two or more toner cartridges of
the same color are detected.
Install the cartridge of the
specified in the specified
position.
Display Cause Error details Remedial measure
Contact the Service
center.
984: error
~
987: error
Mismatch of
Toner cartridge
984:Black
985:
Yellow
986:Mangeta
987:Cyan
Unsupported toner cartridge
has been detected.
Change to correct toner
cartridge.
WDT ERROR PU firmware
runaway
Does this error recur? Yes
Turn on the power again.
Replace the PU board.
ASIC ERROR CU board (CU)
DCON access
error
* DCON
clock output
abnormity
Does this error recur?
Does this error recur?
Yes
Yes
Turn on the power again.
Replace the CU board.
Replace the PU board.
SDRAM ERROR CU board (CU)
DCON access
error
* RAMRD/WR
abnormity for
V
IDEO
Does this error recur?
Does this error recur?
Yes
Yes
Turn on the power again.
Replace the CU board.
Replace the PU board.
ABORT
xxx = xxxxxxxx
PU firmware
runaway
Does this error recur? Yes
Turn on the power again.
Replace the PU board.
IRQXX_IPT PU firmware
runaway
Does this error recur? Yes
Turn on the power again.
Replace the PU board.
Note) Service calls 168 error, 171 error, 175 error, 903 error and 904 error; These errors can
occur when the printer temperature is below 0 °C. Turn on the power again after the
printer temperature has increased

Oki C821 Specifications

General

Brand	Oki
Model	C821
Category	All in One Printer
Language	English