I was getting R-2 error on my JVC 12-disk changer ( a CD was stock inside ) I opened the cd changer and I forced CD back to tray ( my finger bled!!!). I poked a needle in the reset hole ( tiny hole ) and changer started working fine but then I was getting R-3 error code, I bought LENS Clenaer ( a CD with brushes ) from Best Buy and now changer works perfect. Another way of of reseting ( if not with pin hole ) is disconnecting power for 5 Minutes and CD changer resets. If you get R-8 error is wiring problem. Hope this help.

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