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Model kdc-mp438u "protect" shows up on the screen when powered up

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This indicates that a problem has been found in the final output stage of the amplifier. The amp stays off to prevent further damage. Remove all of the speaker wires and try again. If the protect message remains, the problem is within the amp and th amp will need service. If you are able, check the output transistors for a shorted condition as that is the most common failure part.

Keep us posted.
Dan

Posted on Apr 23, 2008

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The Protect Button is pin hole size and is located right above the headphone jack. Hence all shpuld be good from there on.

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it says protect meaning one of the speakers is shorted troubleshoot my speakers all were good put my old radio in everything worked put the kdc back in verified that the radio is bad took back to best buy interchange for a pioneer for about 60 more

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