Brother MFC620CN Service Manual page 193

(3) Remove screw "a" from the MJ shield and take it off the lower MJ/PS shield.
(4) Remove the power supply shield.
(5) Remove five screws ("c" and "d1" through "d4" screws) from the grounding terminal and
power supply PCB.
(6) Remove screw "b" from the MJ PCB and take it off the lower MJ/PS shield.
Reassembling Notes
• When securing the power supply PCB, tighten "d1," "d2," "d3," and "d4" screws in this order.
"a": Screw, pan (washer) M3x8DB
"b" and "d1" through "d4": Taptite, cup S M3x6
5-55
Confidential