E61 at Panasonic CD changer sa ch64.

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Hello :
My audio Panasonic SA ch64m or SC ch64mgc-k
shows E61 when i turn it on and then good bye,is off.
Who knows in which stage should look first?
CD changer was touched before for another man.
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Thanks a lot.

[gary]

f61 on panasonic hifi usually means audio output protection, remove output ic and see if set will then stay on,