Brother GTX pro Instruction Manual page 208

(6) Position the platen sheet to match the platen surface, and onto the platen, stick the portion of the platen sheet
where the release paper (small) was removed.
<TIPS>

If the 16X21 platen is used, slide it forward before working on it.
(7) Peel off the rest of the release paper, and paste the whole platen sheet onto the entire platen.
<TIPS>

Straighten the platen sheet, and stick it properly while pressing it with hands outward from the center to avoid making
wrinkles.
Release paper
(8) As required, print a grid pattern onto the new platen sheet.
☞ "5-5-4. Print a grid pattern on the platen sheet >>P.108"
<TIPS>

After the printing is completed, press down the printed surface lightly with a dry cloth or a sheet of paper to dry the ink.
Precautions to keep good printing quality/use printer over the long term
Positioning
Platen sheet
Platen
Platen sheet
Platen
208
X0065
X0066