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No lights and no display. I have verified electrical outlet is providing electricity to the unit.

My Gevalia cm 500 has had little use and is about 18 months old. It acts as if it is not getting electricity but the electrical outlet is providing electricity. What can you suggest?

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Upon visual inspection of the PC board, a small portion of the board had been burned. Using a voltmeter to check components in that area, it was discovered a 24 volt zener diode was nonfunctional. I then purchased two 12 volt zener diodes (no 24 volt was available), and installed / soldered them, in series, on the PC board. I then reassembled the Gevalia cm 500 unit and made delicious coffee. What remains unknown is what precipitated the failure of the 24 volt zener diode.

Posted on May 24, 2009

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