Brother GT-3 Series Service Manual page 236

Disassembling
1.
Remove the Cover Cartridge. (Refer to "6-1-2. Assembling/Disassembling of the Covers".)
2.
Confirm the pattern of the Ink Switch Dog Unit; Center type, Left type or Right type.
3.
Remove the two Screws (3) and the remove the two Cord Holders: NK-18N (4).
<Note> Depending on the unit, there are no Cord Holders: NK-18N (4) mounted originally.
4.
Remove the four Screws (5) and make the two Tube Holder Fixes (6) free.
Do not remove the Tubes from the Tube Holder Fixes.
5.
Remove the eight Connectors (8) of the Harness: Ink Sensor from the Ink Sensor PCB Assy (7).
(4)
( 3)
(5)
(6)
(8)
(7)
GT-3 Series
6. Replacing Parts
227