Brother DCP-J552DW Service Manual page 148

(10) Unlock the connector on the carriage PCB and disconnect the head flat cable.
Note After disconnecting the flat cable, check that each cable is not damaged at its end or short-
circuited. When connecting the flat cable, do not insert it at an angle. Lock the connector, after
confirming that the cable is not at an angle.
(11) Remove the spring lock and slightly raise the front end of the carriage PCB. Next, remove the
carriage flat cable from the cable guide of the head/carriage unit (refer to the illustration in
3-39) and release the boss from the opening in the film (refer to the illustration below).
(12) Take the carriage PCB ASSY out of the head/carriage unit and put it on the upper cover in front
of the head/carriage unit.
Head flat cable
Carriage PCB ASSY
Film
Opening
Carriage flat cable
Boss
Upper cover
Remove by pulling the lock
Carriage PCB ASSY
Head flat cable
3-31
Head/carriage unit
Lock spring
Head/carriage unit
(3_038)
page
Confidential