How to use the PSU Tester

Some Seasonic Consumer power supplies ship with a simple Power Supply Tester included in the box to help users quickly check whether the power supply is working properly.

How to check your power supply?

  1. For your safety, first turn off the power supply by setting the I/O switch on the back panel to the ā€œOā€ stand.
  2. Unplug the AC power cord from the power supply.
  3. Disconnect all peripherals and devices from the power supply.
  4. Plug the AC power cord back into the power supply and make sure that the AC power is coming directly from the wall outlet (do not use power strips, extension cables or splitters).
  5. Before you start testing, connect both the 18-pin and 10-pin connectors of the motherboard cable to the power supply.
  6. Attach the Power Supply Tester to the end of the 24-pin motherboard connector. There is a notch on the Tester that fits directly into the notch on the 24-pin connector.
  7. Make sure that the fan control switch* on the power supply is set to Normal Mode (S2FC). (In Hybrid or Fanless Mode (S3FC) the fan will not turn.)
  8. Turn on the power supply by setting the I/O switch to the ā€œIā€ position.
  9. If you see the power supply fan* spinning then you know that your power supply is working.

Please note: This is a very basic method to test power supplies; for a more precise examination, please contact our RMA services.

ATTENTION! Please use only cables provided by Seasonic! If you need further assistance, please contact Seasonic support.

* When a power supply does not have a cooling fan (PRIME Fanless Series), or it is not equipped with a fan control switch (FOCUS SGX Series), you can still follow a similar procedure to test your power supply. After attaching your power supply to the motherboard in step 5, you can simply use a Molex cable to connect an external fan to it. If the external fan starts spinning when you switch on the power supply, then the power supply is working properly.

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