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Re: Separating channels
The lights show how many recordings are happening, but don't relate to specific tuners, so they don't help here.
Instead, press the Info button, then press Down four times. You'll get a screen like the attached. Here I'm watching channel 620, and the other tuners are on channels 160 (which is recording) and channel 221 (which isn't). To switch between tuners, move the highlight to one of the two other tuners, and press OK.
By shuffling between the tuners, you'll be able to work out if one has a problem. But really I doubt it is a tuner fault. It's unlikely a tuner fault could affect the sound without also affecting the picture. Could it be only certain channels, maybe?
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