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 40 (click to view)
Installation and connection instructions
The special spanner (E) and the caps (D) (2 each) and (G) (1 each) are supplied with it. 3. Remove the two screws (A) with the special spanner. 4. Remove the 4 screws (B). 5. Remove the transit bar (C). 6. Screw the 4 screws (B) back in for safe keeping. 7. Close the 2 large holes with the caps (D). Important! When fitting the plastic caps, press until they snap into the rear panel securely. 8. Remove the screw F, including the compression spring with the special spanner E. 9. Cover the hole with the cap G. Important! When fitting the plastic caps, press until they snap into the rear panel securely.