Question about Pioneer DEH-1800 CD Player
You have a shorted speaker or a speaker with a bad voice coil. This has been confirmed by the fact that the audio amplifier is shutting down (protection) but the unit stays powered on. The speakers will play for a few seconds or maybe even longer at lower volume, but any length or time or an increase in volume will immediateley shut off sound. This is due to the fact that a shorted speaker wire/connection will ground out or short to one another. If you have checked all connections behind the radio AND at the speakers and found no problems, then it is a voice coil on the speaker. A shorted voice coil will work until the speaker cone moves causing the short or until enough power passes through the voice coil's short to turn off the radio.
1. You can use a voltmeter set to check continuity to test for a speaker short. Disconnect all speakers from the radio and connect one side of your meter to ground and the other to the speaker lead. An audible "beep" will confirm a short.
2. The other method would be to disconnect all speakers and re-connect them one by one until the radio's sound output shuts off again. This will be your shorted speaker.
I hope this information was helpful.
Posted on Sep 28, 2008
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