Brother MFC620CN Service Manual page 189

MFC425CN and DCP315CN/120C
- Power supply harness (4-pin)
- PF motor/sensor PCB harness (7-pin)
- Carriage motor harness (2-pin)
- MJ-main harness 1 (2-pin)*
- Speaker harness (2-pin)
- Head flat cable 1 (17-pin)
- Head flat cable 2 (19-pin)
(6) Remove four screws (three "d" and one "e" screws) from the main PCB, then lift up the PCB.
(7) Remove screw "c" from the main PCB shield frame.
(8) Remove the main PCB film and shield frame.
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