Proton 520 Integrated Amplifier with quiet left channel
My Proton 520 Integrated amplifier has a problem. The left channel is very quiet. When I try to adjust the balance to compensate, I get static and it sometimes turns almost completely down. The right channel plays fine, and the sound is great.
I have taken the cover off, and downloaded the schematics. I am not sure where to begin testing things to see what caps, resistors or transistors I might need to replace. I am new to amplifier repair, but I have a basic understanding of electronics, and I have completed some solder repairs before.
Thanks for any help!
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A search with Google shows no such number. If this is truly a Class A amplifier, in my experience, there are no output ICs. Even so, unless they process both channels in one IC, there would be a complementory IC on the other channel.
Did you try to switch the loudspeakers? Before changing anything always lover the volume and switch off the amplifier. Assuming you tested already different inputs, you can be sure no cable from signal source is out or defect. (or did you nit check that first?). When the amp is switched off, disconnect the speakers and switch left to right and right to the left output.. If the other speaker is quiet now, you are sure it is in the amp. Still his can be anything. You can check the connections between the pre and main amplifier on the back side. When you have an extra set of interlink cables, perhaps you can cross the in and output there too. Take care every time you change something, lower the voltage and switch off the amplifier. Sudden clicks when switching on or changing anything can damage the amp and or the speakers.
Perhaps when you checked this you can locate where the problem is? Speaker, speaker cable, power amp, pre amp, (only a part of the pre amp.
Well it sounds like your amplifier IC's are working correctly since you are hearing that pop. I have the same amplifier and every 10db increment it pops. Have you tried every input? Possibly try starting at a low volume, plug an RCA plug into CD or any other input, and touch the center prong of the other end of the cable. You should get a 60hz hum if your in the USA, otherwise it will be 50-55hz. Regardless it should make noise.
4 speaker wires, black, green, red, white ;speaker left +speaker right +speaker left -speaker right. First see what pair of speaker wires go to left the channel of the amplifier. One of each speaker must be connected to each amplifier´s channel, no matter of colors of the wires. Two wires for each speaker to each channel of the amplifier (rear panel + and -). Then you will have 4 wires connected to 2 stereo channels of your amplifier. Two wires for each speaker.
test you speaker maybe there is a bad connection some where is the spk. box its self ,try changing speakers left to right . it the spk. are ok open amp see all the connections within the amp . if this dose not work contact me by mail: email@example.com
Try swapping the speakers around from channel to channel, If the problem moves it is a speaker or a lead. It could also be something as silly as a loose knob ( especially if the unit travels), Another problem can be an input socket/plug with a broken wire/link. Failing that get a tech to look at it for an estimate, as the amp is a cheap item, to buy, a repair bill may be more than it is worth.
That is a strange problem you have indeed. The amp switches automatically from one input to the other, with default to input 1. You say the source sound dips low, is this a source from another integrated amp, where the AMP100 is working as a zone 2 device? . Are you using it as a zone 2 amp, and plugging other devices in the zone 2 area? and lastly, are you using auto on functions? Let me know, and we may be able to figure it out for you.
If it is new, then it may be worthwhile swapping it over for another by the supplier of the amp