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 11 (click to view)
This appliance complies with European regulations on low voltages, EEC Directive 73/23 on electrical safety, and with the following European regulations: EEC Directive 89/336 on electromagnetic compatibility and EEC Directive 93/68 on EC marking.