Abnormal Sound Is Heard - Oki B721 Maintenance Manual

Oki Data CONFIDENTIAL
Check item
(2-1-3) Check the system connection
Connection Check contents of (1-1).
condition of the The printer will not start operation until the
control panel control panel is detected and its operation is
started.
(2-2)

Abnormal sound is heard.

Check item
(2-2-1) Check loss of synchronization of motor (Driver error)
Condition of the Check for normal wiring conditions of the
motor cable respective motors.
Perform the visual check and measure
resistance at open circuit with VOM as follows.
Remove the motor cable at the board end.
Measure resistance between the respective
pins of the removed cable and FG with VOM.
Operating Check if operations of the respective motors
conditions of the are normal or not by using the self-diagnostic
respective motors mode.
Check if any load exists or not.
"Buzzer" sound when an error occurs.
(2-2-2) Check loss of synchronization of motor (Abnormal load of the consumable item)
Operating Check if operations of the respective motors
conditions of the are normal or not by using the self-diagnostic
respective motors mode.
Check if any load exists or not.
"Buzzer" sound when an error occurs.
45487001TH Rev.1
Actions to be taken
Check work
at NG
Follow the
contents of (1-
1).
Actions to be taken
Check work
at NG
Replace the
motor cable.
Re-connect the
cable for normal
conditions.
Replace the PU/
CU board.
Replace the
corresponding
consumable
item.
If any attempt
of using new
part as a trial
is going to be
made, be sure to
use the System
Maintenance
Menu FUSE
KEEP MODE.
Check item
(2-2-3) Check the jumping phenomena of gear tooth. (Abnormal load of the consumable
item)
Operating Check if operations of the respective motors
conditions of the are normal or not by using the self-diagnostic
respective motors mode.
Check if any load exists or not.
"Buzz buzz" sound is generated when an
error occurs.
Installation Check by visual inspection if the respective
condition of each consumable items are installed in their normal
consumable item positions in which gears of the consumable
items engage accurately or not.
(2-2-4) Check the wiring conditions of cables
Wiring conditions Check if the cable contacts with the fan blade
of the cables in because wiring conditions of the cables near
the vicinity of the fan is poor or not.
respective cooling "Clap, clap" sound is generated when an error
fans occurs.
6. Troubleshooting procedure
Actions to be taken
Check work
at NG
Replace the
corresponding
consumable
item.
If any attempt
of using new
part as a trial
is going to be
made, be sure to
use the System
Maintenance
Menu FUSE
KEEP MODE.
Replace an
appropriate
mechanical part
as required, or
adjust or repair
Correct the
wiring conditions
of the cable.
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