Brother P-touch 550 - Manual (Page 23)

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Occasionally, specks of dust or dirt become attached to the machine’s print head and rollers.
This is particularly likely when you are using the unit outdoors or in a very dusty environment.
If a section of the print head is covered with dust, a blank horizontal streak may
appear through the text in the printed label.
Therefore, as with a tape recorder, the machine’s head may need to be cleaned from time to
time.
TO CLEAN THE PRINT HEAD
Ê
Turn off the machine.
Ë
Open the tape compartment cover, then remove the tape cassette if one is installed.
The print head and rollers are located in the tape compartment.
Ì
Print head: Use a dry cotton swab to gently wipe the print head with an up-and - down
motion.
Rollers: Use a dry cotton swab to wipe each roller with an up-and-down motion while
rotating them with your finger.
Í
Try printing again.
If dust still remains:
Î
Repeat step
Ì
using a cotton swab dipped in isopropyl (rubbing) alcohol.
If none of the above works, contact your service representative.