Brother International HL-1070 Service Manual - Page 78

Black spots

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I-15 Black spots Possible cause Drum unit Fixing unit SR PCB Step 1 2 3 Check Are the spots at 94mm intervals? The problem is not solved after printing a few pages. Are the spots at 63mm intervals? And the problem is not solved after printing a few pages. Is the problem solved after the SR PCB replaced? Result Yes Yes Yes Remedy If toner remains stuck, wipe it off gently with a cotton swab. Replace the drum unit if the OPC drum is scratched or deteriorated (exposed). (Refer to the following note.) Check and clean the heat roller with a cloth dampened with alcohol. Replace the fixing unit. Replace the SR PCB. Note: Clean the drum unit as follows: (1) Place the printing samples in front of the process unit, and find the exact portion of image defect. Position of smudge on the drum 94mm interval Fig. 4.2 (2) Turn the drum gear by finger while looking at the surface of the OPC drum. Fig. 4.3 IV-14

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IV-14
I-15
Black spots
Possible cause
Step
Check
Result
Remedy
Drum unit
1
Are the spots at 94mm
intervals?
The problem is not solved after
printing a few pages.
Yes
If toner remains stuck, wipe it
off gently with a cotton swab.
Replace the drum unit if the
OPC drum is scratched or
deteriorated (exposed).
(Refer to the following note.)
Fixing unit
2
Are the spots at 63mm
intervals?
And the problem is not solved
after printing a few pages.
Yes
Check and clean the heat roller
with a cloth dampened with
alcohol.
Replace the fixing unit.
SR PCB
3
Is the problem solved after the
SR PCB replaced?
Yes
Replace the SR PCB.
Note:
Clean the drum unit as follows:
(1)
Place the printing samples in front of the process unit, and find the exact
portion of image defect.
Fig. 4.2
(2)
Turn the drum gear by finger while looking at the surface of the OPC drum.
Fig. 4.3
Position of smudge on
the drum
94mm interval