The amp photos are from the same model but the amps are not very similar. Yours appears to be missing the preamp board. The main board photo below has had all three daughter-boards removed. The driver board below without the RCA jacks replaces the 4 boards in your amp.
Is the noise visible on the positive rail as well?
Here is the signal, I don't see the noise now. My connection might have been bad.
I've seen this type of signal before on some Rockford amps and it has been a problem in the protection circuit. I have little experience on Orion amps, kind of clueless right now.
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