Oki B721 Maintenance Manual

Oki Data CONFIDENTIAL
45487001TH Rev.1
6-63 /
6. Troubleshooting procedure
(15-3) Error caused by the defective mechanism
Check item Check work
Actions to be taken
at NG
(15-3-1) Mechanical load applied to the ID unit
ID unit Check if a heavy mechanical load is being
applied to the ID unit due to breakage of the
waster toner belt, or not.
Replace the ID
unit.
If any attempt
of using new
ID unit as a
trial is going
to be made,
be sure to use
the System
Maintenance
Menu FUSE
KEEP MODE.
(15-3-2) Motor operating condition
ID motor Confirm that the respective ID motors work
normally or not by using the Motor & Clutch
Test of the self-diagnostic mode.
Check if any extra load exists or not.
Replace the
PU/CU board
or the ID motor.
6.5.2.(16) Fuse cut error (Errors 155)
(16-1) Fuse cut error
Check item Check work
Actions to be taken
at NG
(16-1-1) Check the system connection
Cable connecting
the PU/CU board
Check if the HEAT connector
of the PU/CU
board is connected halfway, or inserted at an
angle.
Check if cable has open-circuit or its sheath is
peeled off.
Connect the
cable normally.
Alternately,
replace the
cable.
(16-1-2) Fuse cut circuit
PU/CU board Upon completion of the system connection
check, turn off the power once and back on.
The check if the error occurs or not.
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