44952001TH Rev.2
7-77
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURES
7.5.5. (15) LED head cannot be recognized. (error code 131, 132, 133, 134)
(15-1) Service call 131 to 134 (LED HEAD Missing)
Check item
Checking method
Action in case of NG
(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.
Correct 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 show 5V. (See
section 7.6.)
Or, instead of the above, check if each fuse
F501 is open or not.
Replace the CU/PU
board.
7.5.5. (16) Toner cartridge cannot be recognized. (error code 540, 541, 542, 543)
(16-1) Error caused by the consumable items.
Check item
Checking method
Action in case of NG
(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
Checking method
Action in case of NG
(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.
