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 8 (click to view)
Maintenance and Cleaning
Before any maintenance or cleaning work is carried out DISCONNECT the appliance from the ELECTRICITY supply.
Removing the ventilation grille
The ventilation grille can be removed, e.g. to wash the grille. Make sure the door is open when removing the ventilation grille. Unsnap the upper edge of the grille by pulling outward/downward. Then pull the grille straight out to completely remove it.
Clean the inside and the accessories with warm water and bicarbonate of soda (5 ml to 0,5 litre of water). Rinse and dry thoroughly. Do not use detergents, abrasive powders, high perfumed cleaning products, wax polishes or cleaning products containing bleach or alcohol . Regulary check the door seals and wipe clean to ensure they are clean and free from debris.
Wash the outer cabinet with warm soapy water. Remove the ventilation grille (see the section "Removing the ventilation grille") and vacuum-clean under the cabinet. Once or twice a year dust the condenser (black grille) and the compressor at the back of the appliance, with a brush or vacuum cleaner, as an accumulation of dust will affect the performance of the appliance and cause excessive electricity consumption. When moving the cabinet, lift it by the front edge to avoid scratching the floor.
To Change the Light Bulb
The light is switched on automatically when the door is opened. Before replacing the light bulb, disconnect the power plug from the outlet. To replace the lamp in the chiller compartment (only cabinets with two doors), first unscrew the lamp grille with a screwdriver. Use a bulb of the same type, E14 socket, maximum rating of 25 W.