Brother GTX pro Instruction Manual page 142

From the lowest position to the middle position
(1) Detach the platen.
(2) Remove the platen fixing lever, platen height adjustment lever.
The number of collars and the height adjustment range are as follows:
Position
Highest position
(standard)
Middle position
Lowest position
Case of 16×21 platen
Position
Lowest position
<TIPS>

Spacers are installed on your printer so that the height can be the reference value. Do not change the number of spacers.
(3) Loosen the knob while holding the platen bearing and lift the platen bearing to the top to tighten the knob again.
Height No. of collars
0 to 10 mm 2
10 to 20 mm 1
20 to 30 mm None
Height No. of collars
0 to 10 mm None
Spacer
Knob
Platen height adjustment lever
Platen fixing lever
Platen bearing
142
Basic printing procedures
X0266
X0267