Actually, I was looking for this information for 3 years!...now thanks to you, the manual is on my hands and of great help, cause I understand now where I was doing wrong connections and wires...excellent, I'll be back to you if in need, thank you.
This manual covers the main equipment features only. While it also includes the procedure for saving and loading from the now long obsolete memory cards it does not mention the how to operate with the optional floppy drive interface so I am still at a loss about how to use this! Note that there is a separate manual covering the MIDI interface and programming via the keyboard, not included in this download. You will also need to get hold of this if you want to use the MIDI interface properly. Basically there is little difference between this manual and the free to download manual for the similar PR60 model.
Good list of manuals. I found a very rare one and easily get. Should be promptly to download, as we must to wait hours even after confirmed payment.
Text excerpt from page 41 (click to view)
Useful Information
Belt clip (KX-TG2421 only)
You can hang the handset on your belt or pocket using the included belt clip. To attach the belt clip
Headset (optional, KXTG2421 only)
Connecting an optional headset to the handset allows hands-free phone conversations. Please use only a Panasonic headset. See page 5 for compatible headsets and ordering information. To connect an optional headset to the handset
To remove the belt clip While pressing the top of the clip (1), pull the right edge in the direction of the arrow (2).
Headset jack 2 1
L Model shown is KX-TCA86. Note: L To switch to the speakerphone, press {s}. To return to the headset, press {C}. For assistance, please call 1-800-211-PANA (7262).