Brother GTX-4 Service Manual page 291

(9) Unlock the print head, and remove the print head.
<IMPORTANT>

When removing the print head, take care not to drop ink on the carriage plate. If ink drops, wipe it off.
Print head
(10) Release the lock by pulling (a) part toward yourself, and take out the new print head from its case.
<IMPORTANT>

When removing the print head, be careful not to touch the nozzle surface at the bottom of the head. Otherwise it may cause
poor printing.
<TIPS>

Sometimes, you may find it hard to remove the print head when you try to open the lock of (a) part. If it is hard, use both
hands to remove it.
Lock
②
①
Print head
(a) part
Disassembly / Replacement / Adjustment
Case
6-100
X0131
X0069