Brother MFC-3340CN Service Manual page 144

(5) Remove four screws (three "d" and one "e" screws) from the main PCB, then lift up the PCB.
(6) Remove screw "c" from the main PCB shield frame.
(7) Remove the main PCB film and shield frame.
SDAA enclosure
"c"
"d"
Thermal conductor
rubber
J-line harness (2-pin)
J-main harness 1 (2-pin)
(8) The thermal conductor rubber is attached to the solder side of the main PCB. When replacing
the main PCB, gently remove the thermal conductor rubber from the main PCB and attach it to
a new PCB. (For details, refer to the next page.)
"e"
"d"
Power supply harness
5-46
ain PCB
"d"
ain PCB film
ain PCB shield frame
Lower cover
NOTE: Screw tightening order
First tighten screws "d" and "e" and
then screw "c."
"c": Screw, pan (s/p washer) M3x8
"d": Taptite, cup B M3x8
"e": Taptite, cup S M3x6
Ink cartridge/purge cam
switch harness
Confidential