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Some part inside will have developed a thermal fault. It should be easy to track it down. Take off the top cover. Wait while it's cold. Then power it up. Don't leave it on long. Switch off then feel around for the hottest part. Don't burn yourself! Also look around for burnt parts. Sometimes a burning smell will come off the affected part. Generally it will be the part that heats up first and fastest that's gone. The main amp area on the heat sink is the biggest suspect. It may contain one or several devices any or even ALL of which could have gone!
2 Channel Peavey CS-800 Amp (800 Watts) ...Peavey CS-800x 800 Watt PA Stereo power Amplifier. The Part in question Q4025P is an alternistor. Two SCRs back to back that may have shorted out if it is not working.
upgrade your 302 to 502 need to replaced the toroid transformer, set of output amplifier, set of electrolytic capacitor.
Purchasing of these parts one-by-one is much expensive rather that you buy a brad new Konzert AV-502. Also upgrading the unit is quite tech and need a lot of experienced in electronics.
Hope that it may help you.
Have a nice day.
It's a log time ago that I repaired those amps., but I give it a shot.
There's a speakerprotection after the finals, what I remember it's a triac (SAC187, or something like that).
You will find it at a small pcb at the back of the amp. Normally it has three legs but the centre is cut away. If it's down you will measure 0 Ohm at the output, also with a switched off amp.
Thats all I can remember, it was about 25 years ago.
Remove the output transistors and measure each of the sets of 3 pads and report the voltage readings here. I suspect that you have either a blown driver circuit or output transistors. The voltage readings will give me an idea on where to start looking for specifics.