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.
Thank´s for your help, I already recived these manual from you
Text excerpt from page 22 (click to view)
1. 2. 3. .
Unscrew the upper pin and remove the spacer Remove the upper door
Remove the hinge cover (A).
4. 5.
Unscrew the pins (B) and the spacers (C) and refit them on the middle hinge of the opposite side. Snap the hinge cover (A). Refit the upper door, the upper pin and the spacer on the opposite side Unscrew the lower pin and remove the spacer and refit them on the opposite side