Brother International IntelliFax-3550 Service Manual - Page 68

High-voltage Power Supply PCB and Fan 1, for any toner particles, paper dust or dirt

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1.14 High-voltage Power Supply PCB and Fan 1 (1) Remove the screw and the insulation film. (2) While pressing down the high-voltage power supply PCB, slightly shift it to the front of the machine. (3) Slightly lift up the high-voltage power supply PCB and disconnect the following four things: • Relay-high-voltage flat cable (12-pin) • Eraser harness (4-pin) • Fan harness (3-pin) • Drum grounding harness (2-pin) NOTE: The fan harness and the drum grounding harness pass through the slot below the fan motor film. (4) Take out the fan 1. Insulation film High-voltage power supply PCB Paper ejection sensor Relay-high-voltage flat cable Fan harness Main cover (placed upside down) Drum grounding harness (Front) Eraser harness Fan motor film Fan 1 s Reassembling Notes • Before reinstalling the high-voltage power supply PCB, check the high-voltage contacts for any toner particles, paper dust or dirt, and clean them out. • When reassembling the above parts, make sure that the harnesses are routed on the main cover as illustrated in Section 1.23. • Once the fan motor film is removed, you are recommended to use a new film. • When setting the fan 1, be careful with the installation direction. The name plate should be face-up (when the equipment is placed upside down). IV - 18

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IV –
18
1.14
High-voltage Power Supply PCB and Fan 1
(1)
Remove the screw and the insulation film.
(2)
While pressing down the high-voltage power supply PCB, slightly shift it to the front of
the machine.
(3)
Slightly lift up the high-voltage power supply PCB and disconnect the following four
things:
•
Relay–high-voltage flat cable (12-pin)
•
Eraser harness (4-pin)
•
Fan harness (3-pin)
•
Drum grounding harness (2-pin)
NOTE:
The fan harness and the drum grounding harness pass through the slot below
the fan motor film.
(4)
Take out the fan 1.
Drum grounding
harness
(Front)
Relay–high-voltage flat cable
High-voltage power supply PCB
Eraser harness
Fan motor film
Fan 1
Main cover
(placed upside
down)
Fan harness
Paper ejection
sensor
Insulation film
■
Reassembling Notes
•
Before reinstalling the high-voltage power supply PCB, check the high-voltage contacts
for any toner particles, paper dust or dirt, and clean them out.
•
When reassembling the above parts, make sure that the harnesses are routed on the
main cover as illustrated in Section 1.23.
•
Once the fan motor film is removed, you are recommended to use a new film.
•
When setting the fan 1, be careful with the installation direction.
The name plate should
be face-up (when the equipment is placed upside down).