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 you for your manual It has the basic things to and i use the Oszi for Longer Time.
Text excerpt from page 33 (click to view)
The upper heating element can be folded down to make it easier to clean the oven roof.
Warning: Only fold down the heating element when the oven is switched off and there is no risk of being burnt! 1. Remove the side shelf support rails. 2. Grip the heating element at the front and pull it forwards and out over the support lug on the inner wall of the oven. 3. The heating element will now fold down. Caution: Do not use force to press the heating element down! The heating element might break. Clean the oven roof Repositioning the heating element 1. Move the heating element back up towards the oven roof. 2. Pull the heating element forwards against the spring pressure and guide it over the oven support lug. 3. Settle it onto the support. 4. Insert shelf support rail.
Folding down the heating element
Important: The heating element must be positioned correctly and securely on both sides above the support lug on the inner wall of the oven.