Brother FAX-170 Service Manual page 57

(4) For the FAX-270MC/290MC/520DT/520MC/MFC370MC/390MC: To take out the main
PCB or the power supply PCB in Section 1.18, unhook the battery harness core and
cutter HP sensor harness core from bosses "C" and "D," respectively, at this stage.
Boss "C"
(Unhook the power supply
harness core from here.)
Motor harness
Boss "D"
(Unhook the cutter HP sensor
harness core from here.)
Power supply harness
(Rear)
Relay "F" Rib "E"
Solenoid
harness
IV – 7
Cutter HP sensor
harness
Resistors
Recording
PE sensor actuator
head harness
Main PCB
CIS harness
Electrolytic
capacitor