6000cd drains battery

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Has anyone experienced a problem of a 6000cd radio draining the battery when the radio is turned off?

My wife's 2004 Focus is drawing half an amp even when the radio is off. I believe that the normal current drain in the off condition should be a few milliamps. In all other respects the radio is working.

I discovered that the audio chip incorporates a power switch. the output of this switch feeds the main board chips. I have measured that the output of the power switch/audio IC is feeding high current to the main board when they should clearly be closing down.

  I bought another used radio and it does the same.

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Thanks for your suggestion but I have operated the radio on a bench power supply and the same problem was displayed. 

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