Panasonic KX-FT21BX Service Manual page 59

(6) Black or white vertical lines appear.
Please perform the print
test (page 88).
Do lines appear?
NO
Clean the feed route.
Do lines appear?
YES
Replace the white plate,
CIS unit, etc.
OK?
NG
Go to the read digital board
section. (page 59)
YES
Replace the thermal head.
Clean the white plate and target glass thoroughly.
NO
END
OK
END
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KX-FT21LA