Brother GTX-4 - 2-4. Inner-side View of Front Cover

1-13
Before Using Your Printer for the First Time
No. Name Function
12 Carriage fixing pin
To prevent drying of print heads in an emergency such as a blackout, it
fixes the carriage to the cap position of the maintenance unit.
Refer to "2-3-3. When there is no prospect of electric power recovery for a
while due to power outage".