Oki B721 Maintenance Manual

Oki Data CONFIDENTIAL
45487001TH Rev.1
6-61 /
6. Troubleshooting procedure
6.5.2.(14) LED head cannot be recognized. (Errors 134)
(14-1) Errors 134 (LED HEAD Missing)
Check item Check work
Actions to be taken
at NG
(14-1-1) Check the system connection
Connecting
condition at the
PU/CU board
connector and at
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
the PU/CU
board.
Conduction of the
fuse on the PU/CU
board.
Check that 5V is measured at the ends of the
capacitors CP15 and also check if
the fuse F17 or F13 is open-circuited.
Replace the
PU/CU board.

Oki B721 Specifications

General

Print Technology	LED
Resolution	1200 x 1200 dpi
Processor	533 MHz
Memory	256 MB
Connectivity	USB, Ethernet
Duplex Printing	Standard