Panasonic KX-FT21RS Serivce 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.
1
Disconnect the power cord and the telephone
line cord.
2 Open the cover by pressing the cover open button.
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.
1.14.3.3. CLEANING THE PICK UP ROLLER........Refer to 4 DISASSEMBLY INSTRUCTION
Cover open
button
17
Thermal head
Caution:
Do not push on
the black cover
KX-FT21RS