![]() I can confirm that socket connects to the "NAD Link" sub-board (presumably used for components to control each other). It seems from the schematic that this relay is in fact energized (through the transistor DTC123JS - not sure what type that is) by a signal coming from the socket labelled JL951A. This doesn't seem to have changed anything. I replaced the relay notated as RL901 in an initial attempt to fix the radio. The service manual (with schematics) is at and in the lower right corner, the initial power supply stage is shown (also highlighted in the attached image). ![]() The amount of time it stays on after this "rest" seems to depend on how much "rest" it has had (more "rest" = stays on longer) At first I thought this was a power supply issue, specifically of a relay in the initial power supply stage. But if I allow it to "rest" for at least a few hours, I can power it on again. If I attempt to power the radio on again at this point, nothing happens. I will start by saying that I am a hobbyist, and while I am decently handy with basic DC stuff, I am more hesitant when it comes to mains-powered equipment (that is, reluctant to poke around with a multimeter when it is powered on) The central issue is that after a long period of non-use, the radio powers on and all functions seem to behave normally, but after a couple of minutes, it powers itself off. Everyone - I am trying to troubleshoot my NAD C740 stereo receiver, which either won't power on or won't consistently stay powered on.
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