Oki C821 Maintenance Manual

44015503TH Rev. 1
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Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURE
7.5.3.(4) Black banding/black streaking in vertical direction
(4-1) Thin vertical line (with color) (Refer to Figure 7-2 D.)
Check item Check work
Action to be taken
at NG
(4-1-1) ID unit condition
Filming of the ID
unit
Is print attempted without toner? Replace toner
cartridge with
new one. If
replacement
does not solve
the problem,
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.
(4-2) Thin vertical line (without color) (Refer to Figure 7-2 F.)
Check item Check work
Action to be taken
at NG
(4-2-1) LED head condition
LED head Is an
y foreign material attached on the light
emitting surface of the cell fox lens of the LED
head?
Remove the
foreign material.
(4-2-2) Condition of paper running path
Paper running path Check that any burr that may scatter the un-
fused toner on the paper running path does not
exist.
Remove the
burr.
7.5.3.(5) Cyclic abnormality (Refer to Figure 7-2 E.)
(5-1) Cyclic abnormality occurs in vertical direction
Check item Check work
Action to be taken
at NG
(5-1-1) Cycle
Image drum Check that the cycle is 94.3 mm.
Replace the ID
unit
Developing roller Check that the cycle is 39.7 mm.
Replace the ID
unit
Toner feed roller Check that the cycle is 58.4 mm.
Replace the ID
unit
Charge roller Check that the cycle is 37.7 mm.
Replace the ID
unit
Roller on top of fuser Check that the cycle is 87.7 mm.
Replace the fuser
unit.
Fuser belt Check that the cycle is 125.5 mm.
Replace the fuser
unit.
Transfer roller Check that the cycle is 50.3 mm.
Replace the belt
unit.
If any attempt
of using new
consumable
item as a trial
is going to be
made, be sure to
use the System
Maintenance
Menu FUSE KEEP
MODE.

Oki C821 Specifications

General

Brand	Oki
Model	C821
Category	All in One Printer
Language	English