Brother GTX600NB Instruction Manual page 203

(13) Connect the head board aligned with the positioning pins on the carriage board.
<IMPORTANT>

After connecting, check that the head board is not tilted.
(14) Place the flat cable in the hook and clamp on the carriage.
<CAUTION>

Ensure that the flat cable for head A does not overlap with that for head B.

Extend the flat cable on the print head side toward the carriage board so that the flat cable will not bend.

Fold the flat cable on the print head side.
Hook
(15) Close the carriage board cover.
<IMPORTANT>

Make sure that the latch is securely closed.

Ensure that the flat cables do not extend past the edge of the cover.
<CAUTION>

Ensure that the flat cable for head A does not overlap with that for head B.
Precautions to keep good printing quality/use printer over the long term
Positioning pin
Head board
Latch
Fold the flat cable
6-35
Flat cable
Clamp