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)
Cleaning the hinged grill
This model has been fitted with a hinged top grill element to enable you to clean the roof of the oven easily. Before proceeding ensure the oven is isolated from the electricity supply. Then undo the screw which holds the grill in place. (see Fig. 10) Then gently pull the grill downward to allow access to the oven roof. (see Fig. 11)
Clean the oven roof with a suitable clener and wipe dry before replacing the hinged grill element.
Gently push up the grill element into place and firmly screw into place the holding nut. NOTE: Ensure the grill holding nut is firmly in place to avoid the grill falling down during operation.
What happens if something goes wrong
If the oven does not come on: * Check the oven is in manual operation * Check that it is plugged in properly * Check that the socket switch and/or the switch from the mains supply to the oven are ON * Replace the fuse in the plug, if required, with another of the same rating and check that this plug has been wired up correctly * Check that the socket, when present, is receiving power - by plugging in an appliance you know to be working * Check that the fuse in the fuse box is intact In after all these checks, the oven still does not work, contact your nearest Fisher & Paykel authorised Service Center quoting your model and serial number. Please note that it will be necessary to provide proof of purchase for any inguarantee service calls. In-guarantee customers should ensure that the above checks have been made as the engineer will make a charge if the fault is not a mechanical or electrical breakdown.