Brother International IntelliFax-3550 Service Manual - Page 67

Low-voltage Power Supply PCB

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1.13 Low-voltage Power Supply PCB The illustration below shows the location of the PCBs. NCU PCB (beneath the main PCB) Main cover (placed upside down) Main PCB Low-voltage power supply PCB Relay PCB High-voltage power supply PCB Gear drive unit Fan 1 (Front) (1) Remove the screw from the low-voltage power supply PCB. (2) Slightly lift up the low-voltage power supply PCB and pull out the power switch support. (3) Disconnect the main-low-voltage harness and heater harness (of the blue and brown wires) from the low-voltage power supply PCB. Low-voltage power supply PCB Power cord Main-low-voltage harness (Rear) Heater harness (blue and brown wires) Power switch support Main cover (placed upside down) s Reassembling Notes • When reassembling the above parts, make sure that the above harnesses are routed through the clamps provided on the main cover as illustrated in Section 1.23. IV - 17

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IV –
17
1.13
Low-voltage Power Supply PCB
The illustration below shows the location of the PCBs.
■
Reassembling Notes
•
When reassembling the above parts, make sure that the above harnesses are routed
through the clamps provided on the main cover as illustrated in Section 1.23.
Low-voltage power
supply PCB
Gear drive unit
Fan 1
High-voltage power
supply PCB
Relay PCB
Main PCB
Main cover
(placed
upside down)
NCU PCB
(beneath the main PCB)
(Front)
(1)
Remove the screw from the low-voltage power supply PCB.
(2)
Slightly lift up the low-voltage power supply PCB and pull out the power switch support.
(3)
Disconnect the main–low-voltage harness and heater harness (of the blue and brown
wires) from the low-voltage power supply PCB.
Main–low-voltage harness
(Rear)
Low-voltage power supply PCB
Power cord
Power switch support
Main cover (placed
upside down)
Heater harness (blue
and brown wires)