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 11 (click to view)
CHARGING THE BATTERY
Connect the battery charger
Wait for on-screen indicator to stop flashing
Disconnect the battery charger once charging is complete
A beep will sound when charging begins. It takes a brief while before the charging indicator icon starts to flash. The mains socket outlet must be close to the phone and easily accessible. REMOVING THE BATTERY
Unclip and slide the cover.
Remove the battery
When you first use your phone you must charge the battery for approximately 3 hours.