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amplifier: speaker output broken, headphone jack works?
I have this secondhand amplifier. It turns on, plays discs, and if you plug in headphones, it works great. But the 5+1 speaker/subwoofer output doesn't work at all. I've tried plugging in one or all, nothing works. The fan is on the same board as the output, and the fan won't turn on either. I've tried cleaning it with a dust rag (it was VERY dusty) and still nothing. Is there something wrong like maybe a dead resistor or something? I don't know what to do with it.
1 Answer
- ?Lv 78 years agoFavorite Answer
Many newer home theater receiver automatically turn off the speakers and return the sound mode to 2 channel stereo when headphones are plugged in. Yours may be one of them, and the sensor in the headphone jack has malfunctioned - or something is stuck in there. Take a good look at the headphone jack - you may find a crayon or a piece from a broken adapter stuck in there.
Also when selecting the speakers, along with the icon showing on the display - you should hear relays click as speakers are selected. My guess is that they are not closing, and if there is not an automatic headphone / speaker mute, there is a problem that is engaging the speaker protection circuit.
Most receivers shut down completely during an amplifier failure, however not all do - and you could have a failed surround or center amplifier that is keeping the protection circuit from connecting any speakers. Note that typically the headphones are driven by the main left and right power amplifier - with attenuation of course. However just one shorted amplifier channel will trip the system. At this point, it's time for a qualified technician to check for a shorted amplifier channel. Modern receivers have replaced high current with high voltage, but neither are safe to work around unless you really know what you are doing.
