Brother GT-341 Instruction Manual page 117

Step 4: Confirm the "conditions" of mis-firing.
(1) Print the Nozzle Check Pattern, and check which Print Head has the problem (see "7-2-3. Checking Print Quality with
Nozzle Check Pattern ").
(2) If the missing positions (nozzles) are fixed, then go to Step 5. If the missing position shift every time you print Nozzle
Check Pattern, then maybe some tiny air bubbles are in the Print Head Nozzles. Execute Powerful Cleaning and confirm
with Nozzle Check Pattern. (See "7-2-2. Cleaning the Print Heads").
<Note>
If you have time, leave the printer unused for 15- 20 minutes then the tiny air may be settled.
If you find mis-firing when you print rather large image though Nozzle Check Pattern is OK after Normal Cleaning, go to
Step 6.
Step 5: Clean the Print Head Nozzles.
(1) Clean the Print Head Nozzle using the Nozzle Cleaning Kit (see "7-2-6. Cleaning the Print Head Nozzles").
<Note> Use new Clean Applicators to clean the Nozzles.
(2) Execute Powerful Cleaning to remove air bubbles inside the Nozzles. Print Nozzle Check Pattern to confirm the print
quality. If the problem is not solved after Head Cleaning and print test, go to Step 6.
<Note>
Make sure to execute Powerful (or Initial) Cleaning after Nozzle Cleaning.
If the problem is not solved, go to the next step.
Step 6: Contact Brother Customer Service or your dealer.
Please tell your service how the issue has started, the present conditions, the troubleshooting that you have done, etc. If you
are asked to replace the Print Head by yourself, see "7-2-7. Replacing the Print Head" for the procedure.
GT-3 Series
7. Troubleshooting
107