Oki ES3451 - LED Head Cannot be Recognized. (Error Code 131, 132, 133, 134); Service Call 131 to 134 (LED HEAD Missing); Toner Cartridge Cannot be Recognized. (Error Code 540, 541, 542, 543); Error Caused by the Consumable Items

44473001TH Rev.1
242 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURES
Check item Check operation
Actions for NG
results
(14-1-3) Check the control signals.
Control signal that
is output from the
CU/PU board to the
option tray board
(GOG-1 PCB)
Check the control signals that are output from the
2ND connector
⑬
of the CU/PU board.
Pin 6: TXD (PU -> 2nd)
Pin 5: RXD (2nd -> PU)
Replace the
CU/PU board.
7.5.4. (15) LED head cannot be recognized. (error code 131, 132, 133, 134)
(15-1) Service call 131 to 134 (LED HEAD Missing)
Check item Check operation
Actions for NG
results
(15-1-1) Check the system connection
Connecting
condition of the CU/
PU board connector
and the head
connector
Check the connecting condition of the FFC by
the visual inspection.
Co
rrect the
connection
to the normal
connecting
condition.
Head FFC Remove the head FFC from the printer. Check
if any open-circuit or peeling-off of sheath has
occurred or not throughout the cable.
Replace the
head FFC or
CU/PU board.
Conduction of the
fuse on the CU/PU
board
Check that measurements taken at both ends
of each capacitor CP6 (C530/C330) and CP8
(C510/C310) show 5V. (See section 7.6.)
Or, instead of the above, check if each fuse F501
(C530/C330) and F6 (C510/C310) is open or not.
Replace the
CU/PU board.
7.5.4. (16) Toner cartridge cannot be recognized. (error code 540, 541, 542, 543)
(16-1) Error caused by the consumable items.
Check item Check operation
Actions for NG
results
(16-1-1) Consumable items installation condition
ID unit and toner
cartridge
Check that the ID unit is installed in the normal
position. Check that the lock lever of the toner
cartridge is locked.
Correct the
installation
to the normal
installation
condition.
(16-2) Error caused by the toner sensor
Check item Check operation
Actions for NG
results
(16-2-1) Toner sensor condition
Toner sensor Is the receptor of the toner sensor stained? Wipe off the
stain from the
toner sensor.
Toner sensor Confirm that the toner sensor works normally by
using the SWITCH SCAN function of the self-
diagnostic mode.
Place a white paper in front of the toner sensor,
and check if the SCAN state changes or not.
Replace the
toner sensor
board, CU/PU
board, or FFC
that is located
between the
toner sensor
board and the
CU/PU board.