Brother International HL-1070 Service Manual - Page 73

Dirt on the back of paper, Cleaning of the pressure roller

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I-5 Dirt on the back of paper Possible cause Fixing unit Dirt in the drum unit Step Check 1 Is the pressure roller dirty? Is any other area in the printer dirty? 2 Is the transfer roller dirty? is the problem solved after the drum unit replaced? Result Remedy Yes Clean the pressure roller. (See the following note.) Yes Replace the drum unit No Replace the H.V. power supply PCB. Note: Cleaning of the pressure roller (1) Set three or more sheets of paper in MP sheet feeder 1 (or 2). 2) Open the top cover. (3) Turn on the power switch while holding down the switch on the control panel. (4) Release the panel switch when the Drum lamp is on. (5) Close the top cover. (6) Hold down the panel switch until the Ready lamp is on, and then release the switch. (7) Print three patterns; grid, zip and solid black. (8) Turn off the power switch with the top cover closed. (9) Set paper in the manual slot with the solid black side up. (10) Turn on the power switch while holding down the switch on the control panel. (11) Release the panel switch when the Drum lamp is on. (12) Press the panel switch again and release it immediately. (13) Print a page of test pattern while cleaning the pressure roller. IV-9

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IV-9
I-5
Dirt on the back of paper
Possible cause
Step
Check
Result
Remedy
Fixing unit
1
Is the pressure roller dirty?
Is any other area in the printer
dirty?
Yes
Clean the pressure roller.
(See the following note.)
Dirt in the drum
unit
2
Is the transfer roller dirty?
is the problem solved after the
drum unit replaced?
Yes
Replace the drum unit
No
Replace the H.V. power supply
PCB.
Note:
Cleaning of the pressure roller
(1)
Set three or more sheets of paper in MP sheet feeder 1 (or 2).
2)
Open the top cover.
(3)
Turn on the power switch while holding down the switch on the control
panel.
(4)
Release the panel switch when the Drum lamp is on.
(5)
Close the top cover.
(6)
Hold down the panel switch until the Ready lamp is on, and then release
the switch.
(7)
Print three patterns; grid, zip and solid
black.
(8)
Turn off the power switch with the top cover closed.
(9)
Set paper in the manual slot with the solid black side up.
(10) Turn on the power switch while holding down the switch on the control
panel.
(11) Release the panel switch when the Drum lamp is on.
(12) Press the panel switch again and release it immediately.
(13) Print a page of test pattern while cleaning the pressure roller.