Brother International IntelliFax-3550 Service Manual - Page 151

Black and blurred horizontal, If the horizontal stripes appear at 94-mm or 17-mm

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Trouble (5) Black and blurred vertical stripes Action to be taken At the scanner Check the following components: - Scanner unit - Mirrors on the scanner unit for stains At the printer side • Clean the paper path which may be contaminated with toner. • Slide the wire cleaner tab to clean the corona wire inside the drum unit. • Make sure that the wire cleaner tab is returned to its home position. • Replace the drum unit. • Replace the heat-fixing unit. (6) Black and blurred horizontal stripes At the printer side • If the horizontal stripes appear at 94-mm or 17-mm intervals, replace the drum unit. • If they appear at 54-mm intervals, replace the heat-fixing unit. (7) White vertical streaks (8) Dropout At the scanner Check the following components: - Scanner unit - Mirrors on the scanner unit for stains At the printer side • Clean the cover glass of the laser unit with a dry soft cloth. • Replace the drum unit. At the printer side • Check the connection of the relay-high-voltage flat cable. • Check the connection between the relay PCB and the main PCB. • Replace the drum unit. • Replace the high-voltage power supply PCB. VI - 17

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VI –
17
Trouble
Action to be taken
(5)
Black and blurred vertical
stripes
At the scanner
Check the following components:
-
Scanner unit
-
Mirrors on the scanner unit for stains
At the printer side
•
Clean the paper path which may be contaminated with
toner.
•
Slide the wire cleaner tab to clean the corona wire inside
the drum unit.
•
Make sure that the wire cleaner tab is returned to its
home position.
•
Replace the drum unit.
•
Replace the heat-fixing unit.
(6)
Black and blurred horizontal
stripes
At the printer side
•
If the horizontal stripes appear at 94-mm or 17-mm
intervals, replace the drum unit.
•
If they appear at 54-mm intervals, replace the heat-fixing
unit.
(7)
White vertical streaks
At the scanner
Check the following components:
-
Scanner unit
-
Mirrors on the scanner unit for stains
At the printer side
•
Clean the cover glass of the laser unit with a dry soft
cloth.
•
Replace the drum unit.
(8)
Dropout
At the printer side
•
Check the connection of the relay–high-voltage flat cable.
•
Check the connection between the relay PCB and the
main PCB.
•
Replace the drum unit.
•
Replace the high-voltage power supply PCB.