Left channel stopped working. I did the usual switching interconnect cables to determine was the preamp and not the power amps, nor source. Is there a troubleshooting procedure to find the cause of this problem? Thanks, Timo
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.
SOURCE: Rotel RA 9808X Amplifier
I'd suspect that one of the two output transistors on that channel has gone bad. If you are unsure how to test or troubleshoot this, then you might try replace both the NPN and PNP outputs and catch the bad one that way. If your amp uses an output module then you would of course have to replace the module which would replace all the output transistors on both channels. Good luck. Another thing to look out for, is the emitter bias resistors. They are the large white ceramic ones near the outputs. Sometimes one of those will open up too. They will be of a very small resistance value like .5 ohms (point five ohms) or something in that general ballpark, and have a wattage value of typicaly 5 watts. So they are pretty big resistors. Be sure to check them all even if you do find a bad output transistor. They will often go out with the transistor. Good luck.
SOURCE: standby power switch
If you are concerned about humidity and switches, spray them with DeOxit. You can get it at Radio Shack.
SOURCE: How do I connect a Polkaudio powered subwoofer (psw 125)
Connect a set of stereo RCA cables from the 'Output 2' on the Hafler to the line imputs on the Sub.Turn on the '1+2' output switch on the Hafler and rock out!
SOURCE: Bryston 4b amp, left channel blows the back panel
I would check out whatever drives the left channel first. If it is a transistor, you can put a ohm meter on the terminals and see if it shows a short (amp turned off). If there are two transistors for the left channel, and you find a short on one only, replace the other to be on the safe side.
SOURCE: Cambridge A5 Amp, only one speaker works when phono selected
If both speakers work okay on other inputs .Then cable from pre-amp to amp and main amp are okay. If phone RCA jacks go directly to electronics board .Then its possible solder on phono jacks need to be resoldered or other connections in that section.If unit needs repair you can also purchase a phono preamp from radioshack hook up your and use it on other good inputs such as CD etc..Please note PHONO inputs are only for turntables .If a non turntable input such as CD,TAPE,TV Etc is used on PHONE .Then you will overdrive this input .
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