Brother International IntelliFax-3550 Service Manual - Page 150

in the illustration given on Replace the high-voltage power supply PCB.

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Trouble (3) Light (4) Dark Action to be taken At the scanner Check the following components: - Scanner unit - Main PCB At the printer side • Check the setting position of the print density dial. • Replace the toner cartridge with a new one and print 4 to 5 pages. If the problem persists, proceed to the next step. • Remove the toner cartridge and start printing. If printing takes place, clean the toner sensor or replace the toner sensor PCB. • Clean the high-voltage contacts for the transfer roller on the drum unit, main cover, and high-voltage power supply PCB. (Contacts 3 in the illustration given on page VI20) • Clean the high-voltage contacts for the developer roller on the drum unit, main cover, and high-voltage power supply PCB. (Contacts 7 in the illustration given on page VI-20) • Clean the grounding contacts on the drum unit, gear drive unit, and main cover. (Contacts 1 and 2 in the illustration given on page VI-20) • 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. • Replace the main PCB. At the scanner Check the following components: - Scanner unit - Main PCB At the printer side • Check the setting position of the print density dial. • Slide the wire cleaner tab to clean the corona wire inside the drum unit. • Clean the high-voltage contacts for the grid and corona wire on the drum unit, main cover, and high-voltage power supply PCB. (Contacts 5 and 6 in the illustration given on page VI-20) • Replace the drum unit. VI - 16

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VI –
16
Trouble
Action to be taken
(3)
Light
At the scanner
Check the following components:
-
Scanner unit
-
Main PCB
At the printer side
•
Check the setting position of the print density dial.
•
Replace the toner cartridge with a new one and print 4 to
5 pages.
If the problem persists, proceed to the next
step.
•
Remove the toner cartridge and start printing.
If printing
takes place, clean the toner sensor or replace the toner
sensor PCB.
•
Clean the high-voltage contacts for the transfer roller on
the drum unit, main cover, and high-voltage power supply
PCB.
(Contacts
3
in the illustration given on page
VI
-
20)
•
Clean the high-voltage contacts for the developer roller
on the drum unit, main cover, and high-voltage power
supply PCB.
(Contacts
7
in the illustration given on
page
VI
-20)
•
Clean the grounding contacts on the drum unit, gear drive
unit, and main cover.
(Contacts
1
and
2
in the illustra-
tion given on page
VI
-20)
•
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.
•
Replace the main PCB.
(4)
Dark
At the scanner
Check the following components:
-
Scanner unit
-
Main PCB
At the printer side
•
Check the setting position of the print density dial.
•
Slide the wire cleaner tab to clean the corona wire inside
the drum unit.
•
Clean the high-voltage contacts for the grid and corona
wire on the drum unit, main cover, and high-voltage
power supply PCB.
(Contacts
5
and
6
in the illustration
given on page
VI
-20)
•
Replace the drum unit.