Brother GT-341 Instruction Manual page 149

(3) Place a sheet of paper (A4 or letter size) at the right corner of the Platen as shown below. Use adhesive tape
to make the paper flat. You can use a T-shirt instead of paper.
(4) Select [ Test Print ] with the Up/Down Button from the menu and then press the OK Button.
(5) Press the Up/Down Button to select either "Nozzle Check CMYK", or "Nozzle Check White" and then press
the OK Button. The following message appears.
(6) Press the OK Button to start printing the Nozzle Check Pattern.
(7) Check the printed pattern to identify which Print Head has the problem.
CMYK:
If there is stripes (arrow 1) or line breaks (arrow 2), the Print Head of the color (in the following example:
Magenta) has the problem. The Print Heads need to be cleaned (see "7-2-2. Cleaning the Print Heads").
1
Paper of A4/ Letter size
2
GT-3 Series
7. Troubleshooting
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