Brother GTX-4 Service Manual page 320

(5) Install the lid to the cartridge. After installation, check if the wind-up shaft is inclined.
<TIPS>

The protrusion of the lid comes in contact with the gear pressure plate in the middle of installation. But you can install the lid
by simply sliding it.
<CAUTION>

Install the lid so that its grooves engage with the ribs of the cartridge.
(6) Install the ink level detection plate spring.
<CAUTION>

Correctly orient the ink level detection plate spring when installing it.
Ink level detection plate spring
Disassembly / Replacement / Adjustment
Protrusion
OK
6-129
NG
If not correctly
installed, the hooks
are too far to easily set
the ink level detection
plate spring, possibly
resulting in removal of
the spring.