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.
Text excerpt from page 72 (click to view)
Insert the BJ cartridge.
r Align the slot of the BJ cartridge with the yellow guide, and gently insert the cartridge as far back as it goes.
r The BJ cartridge will be slightly tilted when you insert it.
Lower the lock lever.
r Press the blue lock lever down completely; do not use excessive force.
r The BJ cartridge is now positioned and locked. If you cannot lower the cartridge lock lever, remove the BJ cartridge and then try inserting it again.