Question about Alpine CDE-9846 CD/MP3 Car Stereo
Just bought a '91 Blazer with an Alpine cd player. The radio worked fine until yesterday. The player powers up fine, all the functions work normally except there is no sound from any of the channels.When switched on, you hear a power thumping noise momentarraly but there is just no sound coming through the speakers. The fuses are all good. Like I said, there is power to the unit, just no sound? Any ideas? Thanks, Clint
It's possible that you have a shorted speaker wire. If one of the speaker wires is pinched, grounded or shorted it will cause the deck's internal amplifier to shut down. The easiest way to check is with a multimeter's resistance function. Remove the CD player and unplug it. Set your multimeter for "resistance" or "continuity". Attach the black probe to chassis ground; you can use the black ground wire in the deck's harness, clean dash metal, or the outer ring of your cigarette lighter. Use the red probe to test each of the speaker outputs in the harness: white, gray, green and violet. If you find a speaker wire that shows any continuity with chassis ground, then that's the cause of the problem. A speaker with a damaged voice coil may also cause the deck to shut down. To test this, probe the positive and negative leads of each speaker and test the resistance between them. For example, to test the left front speaker you'd put the red probe on the white wire and the black probe on the white/black wire. Each speaker should read a minimum of 3 ohms of resistance. If you get a lower reading then it might be causing your problem. If you don't find a problem with any of the speaker wires, then chances are the deck's internal amplifier has failed.
Posted on Jun 09, 2007
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