Question about Sansui RZ-5200AV Receiver

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I am fixing a sansui rz-5000av receiver /amp. the problem is the power supply,it does not switch on. the fuse is fine, capacitors are all ok. But power does not reach connector for the standby supply to switch amp on. Please help

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Ive seen this happen before on sansui a/v amps , seems they have an accessory outlet on back that triggers with power switch (for other items power) well sometime in its past someone plugged something larger than the 500 watts its rated for (ac) load into it and now the traces on printed ckt board are fried , on yours id bet if you look carefully at bottom of main ckt board right in area that power cord connects to it , you have a similar problem , me I fixed mine with a little piece of used solder wick to bridge the gap in traces

Posted on Oct 22, 2015

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So you're saying ac doesn't get very far into the unit. THAT should be easy to diagnose with CARE since ac is usually passed unmodified to the fuses and power supplies, maybe through a relay. Get a digital voltmeter and find out where it disappears after getting into the unit.

Posted on Dec 31, 2010

  • tsakani_co_z Jan 04, 2011

    The ac is there and is converted to dc.The dc goes as far as the relay coil and after that its not there. In order for power to be there the relay must be pulled to ground, but it does not do that

  • David Dunn
    David Dunn Jan 04, 2011

    Right, the relay needs to be activated based on some kind of go/no-go safe-condition-sensing circuitry. Dead shorts, excessive current or NOT all voltages safe would drop or prevent picking the relay.

    One or more of the necessary voltagesor conditions to power the relay coil could well be missing so pulling it to ground to simulate activation might accomplish nothing overall if that same voltage or condition is vital somewhere else in the amp.

    If you can identify the 'safe' signal that the relay passes you COULD just jumper past it and monitor the panel for life. If it lights up then the relay pick circuitry and conditions that enable it are suspect. If it doesn't light up, we're back to square one.

    Of course, this is all risky stuff. Be careful.

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