Brother GTX-4 Instruction Manual page 193

(5) Remove three screws to remove the encoder cover.
<CAUTION>

Do not touch the latch under the encoder cover. Otherwise, the operator may get injured.
<IMPORTANT>

Do not touch the encoder on the main unit.
Encoder cover
(6) Put a proper amount of cleaning solution into the cleaning cup.
(7) Moisten a clean stick R with the cleaning solution.
<IMPORTANT>

Do not return the cleaning solution which has been put in the cleaning cup to the cleaning solution bottle.
<NOTE>

For a proper work operation, be sure to wear the printer-provided gloves.
Cleaning solution
Precautions to keep good printing quality/use printer over the long term
Screw
Latch
Latch
Cleaning cup
193
Clean stick R
Cleaning cup
X0148
X0051