Brother PT-7500 - Manual (Page 61)

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Notes on cleaning the print head & rollers
☞ If a blank horizontal streak appears through the label text, clean the machine’s print
head.
☞ The print head can be cleaned more easily if the optional print head cleaning cassette
(TZ-CL4) is used.
Notes on cleaning the tape cutter
☞ If the tape cannot be cut correctly, clean the tape cutter blades.