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12V Bias Capacitor check.
The 12V bias caps (MAL202136101E3) are the only components on the back of the control board. (Pic 1).
To test the Caps; attach your scope probes to the 12V test points (Pic 2), and set your scope to DC coupling 2Vdc divider, 10ms time divider.
When you turn the unit on (Not loaded) there should be very little to no AC (Pic 4).
If there is a negative going voltage (larger than 1V) like in Pic 3, then the caps need to be replaced (all 8 of them).
I have posted images at Canuck Audio Mart...https://www.canuckaudiomart.com/forum/viewtopic.php?f=4&t=54287http://