White Print (Refer To Figure 6-2 C.); White Print Over Entire Page - Oki B721 Maintenance Manual

Oki Data CONFIDENTIAL
6.5.3.(3)

White print (Refer to Figure 6-2 C.)

(3-1)

White print over entire page

Check item
(3-1-1) Toner condition
Remaining amount Confirm that sufficient amount of toner
of toner remains inside the ID unit.
(3-1-2) Exposure condition to light
LED head Confirm that the LED head is positioned in the
normal position where the LED head opposes
again the drum when the cover is closed.
Check that no obstacle exists in front of the
LED head, that hampers light emission from
the illuminating surface of the LED head.
Connecting Check that the LED head is normally
condition of the connected.
LED head
Drum shaft Check that the drum shaft keeps contacting
with the right and left side plates normally.
F15, F16, fuse on Measure resistance of F15, F16.
the PU/CU board 1Ω or less: Normal
Higher than 1Ω: NG
45487001TH Rev.1
Actions to be taken
Check work
at NG
Replace the
toner cartridge.
Correct the
installation
condition of the
LED head.
Replace the
LED head.
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.
Replace the
PU/CU board
Check item
(3-1-3) High voltage terminal
ID unit terminal Check that the high voltage terminal of the ID
unit is contacting with the Contact Assembly
normally by visual inspection. (Refer to Figure
6-3.)
6. Troubleshooting procedure
Actions to be taken
Check work
at NG
Replace the ID
unit or correct
the high voltage
terminal.
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.
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