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When the signal disappears, you found the problem.Īny compatible signal source (with your device to be tested) will work.Ībout the software solutions I have no experience, reports are that eg the software W&F can actually replace a good hardware one. Now start at the output of the bad channel and work toward the input, probing and listening as you go. Tape up the tip of your probe so only the very tip is exposed, to lessen the chance of damaging something when you slip with the probe. You can make a nice probe out of an old Bic pen, with a nail for the tip, or just hold the cap in your hand and use the lead to inject the signal, but the lead will bend easily. The cap will protect the circuits you probe as well as the tone generator. You need a ground lead with a clip, to connect to the chassis of the unit, and solder a 0.1uF cap in series with the tone signal. Next you are going to make a simple signal injector probe that you will drive with your tone generator.
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You should use speakers you don't care about because you may make some loud sounds if you probe the wrong thing. What you can do is connect the output to a system so you can monitor the sound.
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It can only tell you that there is an AC or DC voltage there but not whether it's your input signal or not and not whether it's distorted or not. Is any other way to troubleshoot? I have a very good multi-meter.