I have a yamaha m4 I took the cover off to clean it and when it is on I moved the 2 big caps when i moved them back and four they made poping sound . If dont move them its fine..is that ok? thank you.
He didn’t say the amp was on nor whether the popping sound was from the amp itself or from the speakers. I’m getting that it was from the amp and indicates deteriorating solder joints at the pcb. Whether the caps are good or not needs to be evaluated by a professional. The M4 was sold around 1980. I put a few out into the world back then. Nice piece.
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