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 43 (click to view)
Sleep Timer
Tray Lock
You can lock the disc tray to prevent the disc from being ejected.
Setting
Turn off the power. And while holding down 7(Stop) on the main unit, press 0(Open/Close). �LOCKED� appears on the display window on the main unit.
Releasing
When the time you specify elapses, the system will be turned off by itself. Carry out the same operations as those for setting. �UNLOCKED� appears on the display window on the main unit.
Press SLEEP.
Each time you press the button, the time indicated on the display window on the main unit changes (in minutes). Example: When Sleep Timer is set to 60 minutes
(Blinking)
Sleep Timer will be automatically set in a few seconds, and the indication will disappear. NOTE
When Sleep Timer is set, the display window darkens automatically.
Changing the time
Reselect the time by pressing SLEEP repeatedly.
Confirming the time
Press SLEEP once while Sleep Timer is set.
Releasing
Press SLEEP repeatedly until �OFF� appears. NOTE
Sleep Timer will also be released when the power is turned off.