I got my amp as a swap: website for disco kit... i have found that the pre amp stage is fine, it shows both channels on the front of the amp, but it doesn't come out through the left speaker. I have changed all the external wiring around to check if it was that, but nothing has changed the situation. On closer inspection inside, i found a wire that had come loose, which i have soldered back on. I have also inspected the base of the main board and all seems ok.
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Re: Left Channel Not Working
You may have blown the power output amplifier on the left channel. This is what this looks like. You will have to take some measurments to determine if the output power amplifier is indeed malfunctioning.
I hope this helps,
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It sound like it could be the pre-amp that is playing up. The picture you posted shows that the pre-amp can be listened to separately. All you need to do is pull the two black jumpers out. And connect a separate power amp to the "pre out" sockets. Leaving the other two not connected. If the weakness is present you will know it's in the pre-amp and not the power amp stage of your amp.
Yes amps buzz when something gets near them - say a pen or probe and if you know what it is safe to touch a finger! Fortunatly for you the left channel is the same as the right. So if you believe it's the pre-amp work backwards from the where the power amp connects to the pre-amp, going through the pre-amp stage by stage - prodding the parts. Remember a buzz in the right a buzz in the left! No buzz in the left but one in the right fault found! Ignore the power supply it's nothing to do with that as it's common to both channels.
Hi there I have a C340 that has similar problem, you must have bought this from ebay, lol.
Nad made a mistake on the C range, the pre - power link can be shorted out. if the pre is shorted out it takes out the pre amplifier stage, I have managed to get the right channel working, I will keep you informed what is the cause of the left channel. I have replaced the pre-amp IC and a couple of Jfets and transistors. Once I have repaired the Amp I could repaire yours if you like???
The left channel output in the amplifier stage is going out - could be a cold solder connection due to overheating. Check the left channel output of the power transistors solder trace - you can compare them to the right channel stage because they're almost identical circuits.
The preamp stage might be dead. Not much you can do but to bring it in. Make sure the input selector is on the right input.
Sometimes there's a "Monitor input" usually Tape2 input that overrides everything
The mono button on your amp is simply feeding one channel to both sides, so is no indication that the other channel is working. Here's what to do. With the good channel comming off your deck, swap it over so it's going in the dead channel side on your amp. If the channel does not spring into life, it's not the record deck that is faulty, but your amp. Now your thinking but it works on CD! True, but the record deck socket on the amp has another pre-amp just for that purpose only. You can track this pre-amp down by following the wires from the socket.
If on the other hand the dead channel comes to life when you swap the jacks around, then it's is the deck. The most obvious fault being the cartridge. But some decks also have a pre-amp in them.
If amp has pre out power in connections the try driving another amp from pre out stage. Try driving power in stage from another source. Swap round inputs to check preamp section Always start at low volume, check sound is ok at low the make it loud.
Write down results of all tests, it will save time and money at the repair shop
It sounds like the preamp wire that carries the left channel signal between the HU and the 2ch amp has an issue. Here's two quick things to check.
Check that both ends of the left preamp cable between the deck and 2ch amp is not loose or disconnected.
Swap the left and right preamp connections at the amp. If the issue stays with the left channel, the issue is with the amp. If the issue moves to the right channel, the issue is with the preamp cable or the HU's preamp output.