Powermatch PM8500 Turned Off Screen All LEDs are lit

I have three PM8500s.Has been used for 5 years Now it appears that the cold machine is turned on and the sound is normal. After 30 minutes of operation, turn off the power switch of the power amplifier, and then turn on the power switch. The power amplifier cannot be turned on normally.There is no display on the screen, and All LEDs are lit on the panel are on.Turn off the power again and wait for the temperature to come down, and it can work again. Confirm that it is the problem of the power board. Who can provide the Schematic or Service Manual, 


Hi there did you have any luck with service manual ? For pm8500n
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