Bought the radio a long time ago but only now opened it up. Did the wind-up routine. Put it in the sun. I thought it was broken. Absolutely no sound from the speaker. Finally, I plugged in a headset and it works okay. Is there anything I can do to fix the volume control? Can it be fixed?
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Re: No sound from speaker
If the volume is adjusted when the headphones are plugged in I'd be looking at the speaker. It may need replacing. I don't know if the headphones are run from a preamp or attenuated via the audio output IC. If it's run from the preamp then the main output could be kaput. Check the speaker and it's wiring first and go from there.
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Park your truck in a silent place (best time to do at night) ask someone to get close to any speaker and in a silent place and turn on the radio. When turning on there should a slight "click" sound in the speaker. If there is a click sound then tune to other radio station and try if still no sound then there is a problem with your receiver circuit. If there was no click sound then either: Your radio amp circuit is gone or Wire connecting speaker are broken
You can trace the broken wire by physically checking the wire from speaker to head unit, if its fine then your radio needs repair.
the drive mechanism has failed. try this. ensure it is fully unwound. then open it. then look for some part of the drive gears or belt that has broken or has slipped off. caution, you MUST ensure it is fully unwound prior to opening it.