Brother GTX pro Instruction Manual page 291

(20) Insert the flat cable into the core and connect it to the carriage board.
(21) Fit the claw by pushing the core until it clicks into place.
Leave a slack to avoid interference between the flat cable and the resin cover.
(22) Place the resin cover back onto the carriage board, and engage the two latches properly.
Tuck the extra flat cable as shown in the illustration.
Flat cable
Latch
291
Troubleshooting
Core
Resin cover
X0413
X0414