Brother GT-3 Series Service Manual page 161

6. Replacing Parts
5.
Tighten the Screw (1).
6.
Adjust the level of the Platen Top Plate by the levelness of the four (B)'s should be 0.5 mm or less, by
repeating the steps 1 to 5 with the center (A) as the standard.
(B)
152
(1)
(A)
GT-3 Series