I am working on a JVC RX-8010V Receiver. The set powers up for about five seconds and then I hear a relay click and it shuts down. I have changed a few electrolytics here and there with high ESR but the problem persists. I am also working at the moment without a schematic. Thought that I would check the Group to see if there may be common problem with this receiver before I try to find a schematic.
Greatly appreciate any help you can provide.
Don and Liz
Normally one needs a service manual to troubleshoot a problem like this, and experience with troubleshooting relatively complex audio and power supply circuits is also essential.
Most likely a DC problem of some sort - either a single amp channel has a DC offset, or a regulated power supply stage has malfunctioned, the likely result of which is a DC offset at all amp channels, or simply that the microprocessor-controlled protection circuit has detected the power supply fault.
There is also a chance of a blown amp channel, shorted output transistors, drivers, resistors, etc. The protection circuit would also be triggered by this, though good design practice would suggest a faster shutdown in this situation. Yamaha receivers for example shut down in less than 1/2 second in an over-current scenario.
Mark Z.
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