Panasonic KX-FT63BX Service Manual page 19

1.14.3.2. CLEANING THE THERMAL HEAD
If dirty patterns or black bands appear on a copied or received document, clean the thermal head.
1 Disconnect the power cord and the telephone line cord.
2 Open the cover by pressing the cover open buton.
3 Clean the thermal head with a cloth moistened with isopropyl
rubbing alcohol, and let it dry thoroughly.
4 Close the cover securely by pushing down on both ends.
5 Connect the power cord and the telephone line cord.
Caution:
To prevent a malfunction due to static electricity, do not
use a dry cloth and do not touch the thermal head directly
with your fingers.
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KX-FT63BX / KX-FT63BX-W