Help, No sound from Turntable

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You might take the JC3 to a local store and have them plug it in to make sure it is working correctly. I never trust looking at a fuse. I always test continuity with a meter. It would be unusual to lose both channels of a cartridge or tonearm at the same time in the same way with out something dramatic happening like an elephant stepping on the cartridge.

You have lost both channels so you have to look at issues that would affect both channels such as switching in the phono preamp or preamp section. First plug another source into the input you are using for the JC3. If it works then you can turn your attention to the JC3. Does it have power? Is it hooked up right? Wires do get pulled out. My cat disconnected the TV once. You have to work your way through to determine where the problem is. Fuses might do this. Some units have them hidden inside. Relays are another weak point.