I have a Peavey Session 500 Mark IV. When I turn it on it usually comes on and works fine. After playing a short while, the volume will go completely down and you can't hear anything at all. I can turn the gain control all the way up and move it around alot and the sound will come back, but it is blaring loud.
I sprayed the control knobs with contact cleaner. Is the power supply possibly going out?
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1. Turn the main and monitor volumes all the way down (off). Plug a cd player into channel 9/10 and play a track of music of your liking. With the main/monitor volumes still off, adjust the gain on 9/10 until the clip light turns on, then back it down until the clip light just turns off. Put the channel volume at 12 o' clock.
2. With the music still playing, turn up the mains to the desired listening level first, and then adjust the graphic eq until the music sounds good in the room. Remember or mark the position of the volume control. Do not use the channel eq on 9/10 for music that has been mastered properly, leave the eq flat. Once this step is completed then you have now set the main eq.
3. Repeat the same for monitors. Turn off the main volume and then bring up the monitor main volume to the desired level first, then set eq. Now your monitor eq is set properly. Remember or mark the position of the monitor volume.
4. Set up microphone - plug a mic into channel 1 with volume all the way down. Speak or sing into the microphone and adjust the GAIN until you see the clip light, then back down a litttle on the gain. Put the monitor and main volumes back up to the mark from step 2. Now adjust the volume and monitor send on the mic channel to the desired loudness first before adjusting the mic channel eq. Use subtractive eq method to minimize distortion and feedback. ...i.e. if the mic is bassy then turn down the lows, do not ADD highs. If the mic needs bass, turn down the highs.
The problem is in amplifier section caused by change value resistor or leak capacitor or cold ,loose or crack solder joint parts this the common problem of over heating and shuts out the amplifier caused by abnormal distribution of current,try to check all the capacitor and resistor and replaced the defected parts ,so your receivers works normal again.
Electronics get things called dry joints, this is where the soldered components become insulated from their surrounding components intermittently. This usually manifests itself some years in use.
The symptoms are just like you describe the system cuts in and out.
I have repaired heaps of these over the years and it takes patience with a magnifying glass and a hot soldering iron to repair..
Id start with the socket connections on the main circuit board where you push cables in and them pulll them out again...as thats where mechanical pressure is
placed onto the conection between the socket and the circuit board.