Antec 550 user manual Installing the Motherboard, Connecting the Power and LED

Installing the Motherboard

This manual does not cover CPU, RAM, or expansion card installation.

Please consult the motherboard manual for specific mounting instructions and troubleshooting.

1.Lay the case down with the open side facing up. The drive cages and power supply should be visible.

2.Make sure you have the correct I/O panel for the motherboard. If the panel provided with the case isn’t suitable, please contact the motherboard manufacturer for the correct I/O panel.

3.Line up the motherboard with the standoff holes, and remember which holes are lined up. Not all motherboards will match with all the provided holes; this is normal and won’t affect functionality.

4.Remove the motherboard.

5.Screw the brass standoffs into the threaded holes that line up with the motherboard. Note: Do not over-tighten the standoffs. Some standoffs may be pre-installed for your convenience.

6.Place the motherboard on the brass standoffs.

7.Screw in the motherboard to the standoffs with the provided Philips-head screws. The motherboard is now installed.

Connecting the Power and LED Picture 1 Picture 2

1.Connect the 24-pin Main Power Connector and the 4-pin +12V connector to your motherboard as needed. If your motherboard uses a 20-pin connec-

tor, detach the 4-pin attachment on the 24-pin power	For 24-pin	For 20-pin
connector. (see pictures 1 and 2).	motherboards	motherboards

2.Connect the Reset switch (labeled RESET SW) to your motherboard at the RST connector.

3.Connect the 4-pin molex connector from the front display to a 4-pin molex connector on the power supply.

4.The Power Switch (labeled POWER SW) connector connects to the PWR connector on the motherboard.

5.The Hard Drive LED (labeled H.D.D. LED) connector connects to the hard drive activity header.

Power supply 3-PIN fan signal connector

A three-pin signal connector with blue and black wires is available to connect the power supply to one of your motherboard’s fan connectors (Note: Some motherboards have a dedicated fan connector labeled PWR-FAN or PSU-FAN that is specifically for the power supply). This connector is for monitoring the power supply’s fan speed only. It is optional—the power supply and its fan will operate normally whether this cable is connected to your motherboard or not.

The fan speed can be monitored through the BIOS or special monitoring software that came with your motherboard. To ensure proper monitoring of the power supply fan, please check your motherboard manual.

Note: At low temperatures, the fan may run as slow as 750 RPM (±10%). At these speeds, some motherboards may not properly detect the fan speed and may generate false warnings of fan failure.

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