Brother HL-7050 Series, Руководство по обслуживанию

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HL-7050 SERVICE MANUAL
6-39
I-5 Dirt on the back of paper
Possible cause Step Check Result Remedy
Fixing unit dirty 1 Is the pressure roller dirty?
Is any other area in the printer
dirty?
Yes
Clean the pressure roller
referring to
the following
procedure .
Dirt in the drum
unit 2 Is the transfer roller dirty?
Is the problem solved after
replacing the drum unit?
Yes Replace the drum unit
No Replace the high-voltage power
supply PCB.
NOTE:
This problem may disappear after printing approximately 10 pages of completely blank sheets.
How to clean the pressure roller
Clean the pressure roller as follows;
(1) Set three or more sheets of paper in the paper cassette.
(2) Turn off the power switch of the printer.
(3) While holding down the Go switch, press – switch, + switch, and then Set switch. The
LCD display shows “TEST MENU”.
(4) Press the Set switch and “SINGLE TEST PRINT” will appear on the LCD display.
(5) Press the + switch and “REPEAT TEST PRINT” will appear on the LCD display.
(6) Press the Set switch and “TEST PRINT NORMAL” will appear on the LCD display.
(7) Press the + switch four times and “TEST PRINT WHITE” will appear on the LCD display.
(8) Press the Set switch and release it immediately. A blank page is printed while cleaning
the pressure roller.
(9) Press the Job Cancel switch after printing three or more pages to stop printing.