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
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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.
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The source/power button in the top left corner changes the mode. Press the button until the aux appears. The auxillary device must be plugged in to register on the stereo.
you can try resetting it. there might be a hole about the size of a pencil tip on the sub panel (behind the face). if no reset switch, try disconnection power to the radio. if you can't get to the back of the radio to disconnect the wire harness, try disconnecting the battery for a few minutes.
Try cleaning the lens first, if you can take the top off and are able to see the lens, using a cotton swab soaked in 91% alcohol wet the lens, don't rub it, then blow it off with computer duster. Or try a cd based lens cleaner (Radio Shack).
What kind of car did you install this in? Did it have a factory radio in it? If I had to take a guess I would think that there is a factory amp that you may have hooked the blue wire from the alpine deck to. If this is the case when you switch to CD the alpine deck turns off the power to the power antenna lead(blue wire) and thus your factory amp. If this is the case hook the factory amp turn on to the blue and white wire and you should be good to go. The same goes if your have an aftermarket amp driving your speakers.
Thanks, I'll try all of your suggestions today.
Clint
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