Question about Kenwood KDC-MP732 CD Player

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Radio is displaying message protect and will not come on

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Protect means it is shutting down the internal amplifier to prevent damage.
Typically it is due to a grounded condition - where there is a speaker coil blown, or bare wire touching metal.

You will have to inspect each speaker further and find the root cause.

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Posted on May 01, 2010

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1 Answer

Protect message displayed when I turned my truck on


The radio is protecting itself from a shorted wire. It could be the speaker wire itself or a bad speaker. If you disconnect the speakers one at a time, you'll find the culprit. Use an Ohm meter to test the wire. It should read 4 Ohms (give or take 2 Ohms. Anything else will cause the radio to protect itself. If the rating is low, it is probably the speaker but check the wiring too.

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When i turn on the power it reads protected and turns off on its on


try unplugging the speakers and then turning it on...if the protect goes away then you have a bad speaker or wiring...if it still displays the same message then the amplifier output may be blown and will need to get it repaired at a shop

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1 Answer

My stereo says" protect" everytime i turn it on. can't get anything else.


Hello grammagrisbo, hi your Kenwood head units will show "protect" when there's a problem with the speaker outputs so check to see if the impedance load meets your radio, 8ohms or 4 ohms?. having parallel two speakers on a single channel may cause this dilemma. This might also mean a shorted speaker wire, a blown speaker, or an internal defect in the head unit. Once the condition that's causing the "protect" mode is fixed, the CD player should be back to normal, the next time you turn it on.
If it's staying in "protect", then you'll definitely have to remove the stereo and do something to fix it. Many car audio stores will do system troubleshooting, for a fee. If you want to do it yourself, here's what you need to do:

Pull the Kenwood unit from the dash and disconnect all the speaker wires. power it on and see if the "protect" message displays. If it does, the stereo has an internal defect and will need to be serviced. If it doesn't, then turn it off, and re-connect one speaker only. Turn it on again and see if it will displays "protect" message.

If the radio works with one speaker connected, connect the other speaker to the second channel, you may have now the idea where the problem begun, you will identify the speaker that's causing the problem. There may be a wiring problem or defective speaker in that channel.

If it displays "protect" with a single speaker connected, then disconnect that one and try the other one. If all the speakers cause a "protect" mode, then you're probably back to a defective head unit.

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1 Answer

My kenwood kdc-x493 is saying protect can you help me fix it


sounds like a shorted speaker wire somewhere...behind the radio disconnect one speaker at a time until the radio no longer displays that message... if you disconnect all the speakers and the radio still displays the message.. it may require service

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First thing to do is disconnect all your speakers at the back of the receiver, then turn it back on. If it does not go into protection, post a comment and I can walk you thru troubleshooting. If it still goes into protection, your unit needs to be serviced. Hope this helps

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That is the common symptom of the defected STK-IC in power amp.section that busted already or just a lost contact.First try to resolder the pins of STK-IC if its works! if not that is the time you replace it, so it works normal again.

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The protect message indicates that there is a problem with the final stage of the amplifier section. This unit will require repair as a reset will not clear this. There is an audio amp IC inside that needs to be replaced. Figure on about $15 or so for the part.

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hello . ok this happends after you try 3 times an incorrect radio code on the radio then you have to let the radio on for 60 min and the lock display will turn to code again if this happends constanly then the radio protection is bad and you need a new radio or you may take the radio to a radio fix place for them to take the protection part out

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