Panasonic KX-FT21RS - Manual (Page 17)

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.
Cover open
button
Thermal head
Caution:
Do not push on
the black cover
Disconnect the power cord and the telephone
line cord.
Open the cover by pressing the cover open button.
Clean the thermal head with a cloth moistened with
isopropyl rubbing alcohol, and let it dry thoroughly.
Close the cover securely by pushing down on both
ends.
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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1.14.3.3. CLEANING THE PICK UP ROLLER........Refer to 4 DISASSEMBLY INSTRUCTION
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KX-FT21RS