Brother GT-3 Series Service Manual page 163

6. Replacing Parts
Firmware Adjustment with GT-3 Service Tool --- Adjust CR Speed & CR Motor Date.
1.
Turn ON the printer.
2.
Execute GT-3ServiceTool.exe by double-clicking.
3.
Select [ Printer Parts Exchange ] and click [ Next ].
4.
Select [ Carriage Motor ] and click [ Next ].
Follow the wizard and adjust the firmware.
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GT-3 Series