Main Pcb, Ncu Pcb And Power Supply Pcb - Brother FAX255 Service Manual

1.18 Main PCB, NCU PCB and Power Supply PCB

If you have already removed the scanner frame ASSY and speaker, slightly lift up the main
PCB together with the NCU PCB and then disconnect the power supply harness from the
main PCB. If the scanner frame ASSY and speaker are not yet removed, follow the steps
below:
FAX255/FAX275/FAX-515/HOMEFAX3
(1) Slightly lift up the rear edge of the NCU PCB and disconnect it from the main PCB.
(2) Slightly lift up the rear edge of the main PCB and disconnect the following harnesses
from the main PCB:
• Main-panel harness (5-pin)
• Cutter home position (HP) sensor harness (2-pin)
• CIS harness (7-pin)
• Recording head harness (12-pin)
• Solenoid harness (2-pin)
• Motor harness (6-pin)
• Speaker harness (2-pin)
• Power supply harness (6-pin)
(3) Lift up the power supply PCB.
Power supply harness
Main frame
(placed upside down)
NCU connector
Main-panel harness (5-pin)
Speaker harness (2-pin)
(Front)
(Rear edge)
P1
SW3 SW2 P7
PH1
P5
PH2
Main PCB
IV – 29
Power supply PCB
NCU PCB
Main PCB
Cutter HP sensor harness (2-pin)
P2
CIS harness (7-pin)
P3
Recording head harness
(12-pin)
P10 P9 P8
SW1
P4
Solenoid harness (2-pin)
Power supply harness (6-pin)
Motor harness (6-pin)