Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
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.
Text excerpt from page 21 (click to view)
Prior to Initial Start-Up
Before connecting the appliance to the mains and putting it into operation for the first time, leave the appliance to stand for 2 hours. This is necessary to allow the oil to flow back into the compressor. Otherwise the compressor may be damaged. 0 1. Please clean the appliance interior and all accessories prior to initial start-up (see section: "Maintenance and Cleaning"). 2. Remove the cold accumulation block from the freezer tray. 3. Place the cold accumulation block into a compartment or drawer only after the optimal storage temperature of -18 °C has been reached, and allow to freeze. 4. After 24 hours place the cold accumulation block in the freezer tray or in the front of the upper drawer. 5. Re-freeze the thawed cold accumulation block in the same fashion, e.g. after cleaning the appliance.