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 17 (click to view)
Replacing the oven light
Disconnect the appliance from its power supply point. Push in and unscrew the glass cap (Fig. 5). Unscrew the light bulb and replace it with a new heat-proof bulb (300 Â°C) having the following features: - Operative tension: 230 V (50 Hz); - Power: 25 W; Fitting: E 14. Reconnect the appliance.
The Hinged Grill
Some models are fitted with a hinged grill element, to enable you to clean the roof of the oven easily. Before proceeding ensure the oven is cool and is isolated from the electricity supply. Undo the screws which hold the grill in place (see Fig. 6). When doing this operation for the first time, we recommend using a screwdriver. Then gently pull the grill downward to allow access to the oven roof. Clean the oven roof with a suitable cleaner and wipe dry before replacing the hinged grill element. Gently push up the grill element into place and firmly screw into place the holding nuts. Ensure the grill holding nuts are firmly in place to avoid the grill falling down when in use.