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 12 (click to view)
4.2 Take off the housing cover together with dome bubble; then separate housing cover& dome bubble.
push
4.3 Mount the "ring" onto "housing cover"; then "ring + housing cover" onto the "housing base" accordingly. Secondly install the metal bracket and fasten it by using supplied four (4) screws. Finally snap 2 supplied sheet spring into the chosen hole of bracket based on the thickness of ceiling. Note: User has to adjust the mounting height of sheet spring according to different thickness of ceiling in order to ensure perfect secured mounting mechanism as the below drawing and table.