Question about Sony DAV-S500 System

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When playing DVD, it's sometimes display 'PROTECT' and stop playing.

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Check if you receive the error when playing any DVD in particular.

What happens when you take out the DVD and try playing it again? Does it play

This protector error denotes several possible problems. Heat, volume level and incorrect DVD settings may be the cause of the problem. The following steps will help you correct your problem and rid your amp of its "Protector" error.

  • Examine your volume setting to be certain that your volume knob is not at maximum. Having your volume cranked too high can cause the capacitors to overheat, shutting down the receiver.
  • Unplug your receiver and disconnect your speakers from the terminals on the back. This will allow you to determine if the error is internal. Plug your receiver back in and look for the same error message. If you continue to get the protector error without having your speakers connected, you may have an internal electrical problem. In this case, contact Sony about finding a repair center.
  • Reconnect your speakers one at a time. The order of connection doesn't matter. When reconnecting, be sure that you do not have your positive and negative speaker wires crossed in any way. After each connection, test your amp by running it with a source. Give each speaker a few minutes of power before connecting the next one. This will help you isolate which speaker terminal is causing the error. When the protector error returns, take note of which speaker connection caused it. Check this speaker wire for shorts or torn shielding.
  • Examine your ohm rating of your speakers if you have no shorts or wiring issues. Sony receivers are not compatible with speakers lower than 4 ohms. Connecting a lower ohm-rated speaker will cause an error.
  • Turn off the surround sound option if you have both your A and B position speakers in use.
  • Keep your receiver well ventilated. Overheating due to poor ventilation can also cause Protector errors.
  • Examine the sampling frequency of your connected DVD player. If the error only occurs when you watch a DVD, the sampling frequency of the DVD player may be set too high. Check the sampling rating in your receiver's manual and in the DVD player

Posted on Mar 22, 2011

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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

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