VR960 auto on amp.

Some subwoofer amps will have reliability problems with the auto-on switch after several years (or months in some very unreliable models). Some individuals who have had them repaired indicated that a capacitor had to be replaced in the auto-on circuit. Electrolytic capacitors can deteriorate with age and heat. If you are merely replacing a capacitor, you just need it specifications so that you can purchase another at Radio Shack or one of the online vendors such as Parts Express. You would not need the circuit diagram. Many manufacturers consider the circuit diagrams for their amps to be proprietary information. You could check with the manufacturer if they would give you the circuit diagram for the auto-on switch. A couple of individuals have replaced the auto-on switch with a simple on-off switch.