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- Nov 28, 2011
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The problem is between measurement points D and E. They should be connected together by a wide track on the top layer, so you should be seeing 17.7V on point E, but there's nothing.
My guess is that the top right relay hole has lost its through-plating and the relay pin isn't making contact with the top-side copper. Another possibility is that there's the same problem with the bottom hole of the big resistor. Or maybe the track doesn't connect to the big resistor - I can't be sure, because the resistor itself is obscuring that part of the board, but I doubt the track would be connecting anywhere else.
So you need to inspect and repair the top right relay hole.
QuantumCheese, yes, hot components are always a concern, but I think that problem will disappear when the track is fixed.
My guess is that the top right relay hole has lost its through-plating and the relay pin isn't making contact with the top-side copper. Another possibility is that there's the same problem with the bottom hole of the big resistor. Or maybe the track doesn't connect to the big resistor - I can't be sure, because the resistor itself is obscuring that part of the board, but I doubt the track would be connecting anywhere else.
So you need to inspect and repair the top right relay hole.
QuantumCheese, yes, hot components are always a concern, but I think that problem will disappear when the track is fixed.