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.
THX
Text excerpt from page 11 (click to view)
Operation
Turning the lighting on/off
The overhead lighting can be turned on and off independently of the fan.
Dimming the lighting
The brightness of the lighting can be adjusted. ^ While the lighting is turned on, press the light button. The lighting will dim until the button is released.
^ Press the light button briefly to turn on the lighting. The light button indicator illuminates. ^ Press the light button briefly again to turn off the lighting. The light button indicator will go out.
^ If the button is pressed again, the lighting will brighten until the button is released. If the button is pressed continuously, the light will cycle between bright and dark. Press the light button again to turn off the lighting.
Indirect lighting
^ Press the indirect lighting switch to "I". The indirect lighting can be turned on when the main power switch is off.