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Why do I have to unplug the AC power while installing FoxFire II test cards?

April 26, 2017AC cards foxfire ii power Test unplug

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Why do I have to unplug the AC power while installing FoxFire II test cards?

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You need to shutdown the system and unplug the AC power before setting up FoxFire II test adapters in your system for testing. This procedure is required for target systems that are capable of supporting S3 and provide 3.3Vaux to all PCI connectors. Without unplugging the AC power to the system, if you try to install the FoxFire II test adapters, you may damage the card functionality as 3.3Vaux auxiliary power is still available on the PCI connector pin 14A. Many systems that support 3.3Vaux have an LED on the motherboard to indicate the presence of 3.3Vaux if the system is shutdown but the AC power is still applied.