Brother GTX-4 Instruction Manual page 281

Close the lid, and put the white ink cartridge in position inside the printer.
(32)
<IMPORTANT>

W12 and W34 cartridges should correctly be placed at their original locations. Wrongly placed cartridges could cause a
printer malfunction.
(33) Repeat the same process to replace the other capping cartridge with the white ink pouch.
(34) On the operation panel, press
Then, the white ink will be installed after the head is replaced with a new one.
<TIPS>

After the procedures are completed, the current screen will go back to the standby mode screen.
(35) Adjust the carriage speed.
<TIPS>

For details, refer to "7-4-1. CR (Carriage) speed adjustment >>P.214".
(36) Perform the V-rating settings configuration.
<TIPS>

Please refer to "7-4-2. V-rating setting >>P.215".
(37) Adjust the ejection timing of the print head.
<TIPS>

For details, refer to "7-4-3. Firing adjustment >>P.216".
(38) Perform the platen feed adjustment.
<TIPS>

Refer to "7-4-4. Platen feed adjustment >>P.217".
(39) Make the position adjustment between the white head and the color head.
<TIPS>

For details, refer to "7-4-5. White/color alignment >>P.218".
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Troubleshooting