Brother MFC620CN Service Manual page 169

Releasing the head flat cables from the head joint
(3) Disconnect the head flat cables 1 and 2 from the main PCB and pull them out to the rear
through the opening provided in the lower cover as shown below.
NOTE: Take care not to drop the flat core from the head flat cables.
(4) Peel the right-hand bent section of the FFC support film off section "a" of the cable clamp on
the head joint and take the head flat cables out of section "b."
FFC support film
Section "b" of
cable clamp on
the head joint
Section "a" of
cable clamp on
the head joint
FFC support
film
Carriage PCB
Head/carriage unit
Carriage-head flat cable
Viewed from the right
FFC sponge
Head flat cable 1
(17-pin)
Carriage PCB
Head flat cable 2
(19-pin)
Bent section
Opening
Cable clamp on the head joint
5-31
Flat core
Head flat cable 1 (17-pin)
Head flat cable 2 (19-pin)
Main PCB
Confidential