Question about Kenwood KDC-MP642U

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I heva a kdc-mp642u and has no power on the display apears protect

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  • juatemoc Sep 03, 2010

    i take out the ic and put the new one and i still have the same problem do you have another idea

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2 Answers

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  • Expert
  • 132 Answers

When you bought the radio there should be 2 metal hook looking things inside of the box.
Take the faceplate off the radio
Remove the black trim ring by gently prying with flathead screwdriver to remove.
Stick in the two metal bars on the left and right side and slide in until it clicks.
Pull towards you gently and the whole radio should begin to slid towards you.
You can grasp the radio and pull as soon as you have enough to grip it.

Then see if you have 12 volts when the key is turned forward on the RED and YELLOW wire either with a test light or a meter.

If you have 12 on one, but not the other then you need to refer to car owners manual for the radio fuse.

Or get back with me with the year make and model of car and I can help you with fuse finding.


Posted on Sep 07, 2010

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  • Kenwood Master
  • 17,129 Answers

Possible that the outputt is short and the audio power output IC is defective . Disconnect the speakerrs to check out one again.
If fault stays then disconnecct the powerr supply to the output IC.
If the protect display changes, then the IC is short for sure.

Posted on Sep 03, 2010

  • Donald DCruz
    Donald DCruz Sep 03, 2010

    Cut the main power to the output circuits and if the short corrects, then check for short.

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En estos modelos quedan grabados los errores de DC en el eeprom y se tiene que limpiar y estos son los pasos para este modelo:

Mientras que el display muestre PROTECT presiona el y sosten el 3 y 6 y luego presiona el RESET mantelos presionados por unos dos o tres segundos y luego suelta el RESET y despues de uno o dos segundos suelta los otros switches.
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Suerte y saludos

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