Brother GTX pro Instruction Manual page 260

Step 3: Check that no ink-jet droplets are ejected from the applicable nozzle
(1) Check locations of the non-ejecting nozzles on the result of the printed nozzle check pattern (1st to 3rd time), and
carry out the following procedures.
Comparison of non-ejection nozzle
positions
The same nozzle always does not
eject ink-jet droplets
A different nozzle does not eject
ink-jet droplets
(2) Check a result of the resultant nozzle check patterns, and carry out the following procedures.
Existence or nonexistence of a
nozzle that does not eject any
ink-jet droplets
Such a nozzle does not exist that
does not eject any ink-jet droplets
Such a nozzle exists that does not
eject any ink-jet droplets
Step 4: Clean the nozzle surface
(1) Clean the nozzle surface of the print heads.☞ "9-2-3. Cleaning of head nozzle >>P.268"
(2) Print out a nozzle check pattern.
(3) Check a result of the resultant nozzle check patterns, and carry out the following procedures.
Existence or nonexistence of a
nozzle that does not eject any
ink-jet droplets
Such a nozzle does not exist that
does not eject any ink-jet droplets
Such a nozzle exists that does not
eject any ink-jet droplets
<IMPORTANT>

Even if the nozzles on the white side have a bit of problem concerning firing, since the white ink is ejected on one same
spot through multiple nozzles, relatively large amount of ink volume will be used, and firing problem of a single nozzle will
not affect the print quality so much. Even in a condition with a problem concerning firing as shown in (a), print is performed
without a problem as shown in (b).
Perform the super cleaning -> print out of nozzle check pattern for the third
time in a row.
Leave the printer as it is for about 30 minutes, and perform the normal
cleaning -> print out of nozzle check pattern for the third time in a row.
Exit
Proceed to Step 4.
Exit
Proceed to Step 5.
(a)
260
Recovery action
Recovery action
Recovery action
(b)
Troubleshooting