Brother GT-3 Series Service Manual page 75

2. Setting up GT-3 Series
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 "2-6-4. Head Cleaning").
1
White:
Like CMYK shown in the previous page, the Print Heads of W1 W2 (GT-381: one in W1, two in W2) have the
problem. The Print Heads need to be cleaned (better to execute [ All Whites]). See "2-6-4. Head Cleaning".
<Note>
GT-3 has multiple White Print Heads (4 on GT-381, 2 on GT-361) and mis-firing is not so severe compared
with the one with CMYK Print Heads. See the left print result on paper and some of the nozzles are not fired,
but the actual print quality on the right print on pretreated T-shirt is enough.
One or two Mis-firing with each Print Head (left) but the normal print (right) is OK
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GT-3 Series