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 5 (click to view)
Maintenance and Cleaning
Before any maintenance or cleaning can be carried out, you must DISCONNECT the hob from the electricity supply. The hob is best cleaned whilst it is still warm, as spillage can be removed more easily than if it is left to cool.
The Hob Top
Regularly wipe over the hob top using a soft cloth well wrung out in warm water to which a little washing up liquid has been added. Avoid the use of the following: - household detergent and bleaches; - impregnated pads unsuitable for non-stick saucepans; - steel wool pads; - bath/sink stain removers. Should the hob top become heavily soiled, it is recommended that a cleaning product such as Hob Brite or Bar Keepers Friend is used.
To keep the pan supports in the correct position, they are hooked into hinges at the back of the hob. The pan supports can be lifted for easier cleaning, as shown in Fig. 2. To remove the pan supports completely, proceed as shown in Fig. 3. The pan supports and are dishwasher proof. If washing them by hand, take care when drying them as the enamelling process occasionally leaves rough edges. If necessay, remove stubborn stains using a paste cleaner.
The burner caps and crowns can be removed for cleaning. Wash the burners taps and crowns using hot soapy water, and remove marks with a mild paste cleaner. A well moistened soap impregnated steel wool pad can be used with caution, if the marks are particularly difficult to remove. After cleaning, be sure to wipe dry with a soft cloth.