Using A Scope To Troubleshoot Hum In Organ Speaker

Hello, I have a Yamaha FS500 organ. There is a hum coming from the center/woofer speaker - when nothing is playing. I recently got an Oscilloscope to better troubleshoot and locate the source of this hum. I am looking for some directions on how to use the scope - i.e. which outputs/inputs, how to place the probe, how to tell by the signal (or wave form) on the scope more information on the possible source of the hum.

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