9.ATX power connectors (20-pin ATXPWR1, 4-pin ATX12V1)

These connectors connect to an ATX 12 V power supply. The plugs from the power supply are designed to fit these connectors in only one orientation. Find the proper orientation and push down firmly until the connectors completely fit.

In addition to the 20-pin ATXPWR1 connector, connect the 4-pin ATX +12V power plug to provide sufficient power to the CPU.

1. Do not forget to connect the 4-pin ATX +12V power plug. Otherwise, the system does not boot up.

2.Make sure that your ATX 12 V power supply can provide 8A on the +12V lead and at least 1A on the +5-volt standby lead (+5VSB). The minimum recommended wattage is 300W. The system may become unstable or may not boot up if the power is inadequate.

PSCH-SR

Pin 1

ATXPWR1

 

+3.3VDC

+3.3VDC

GND

+5.0VDC

GND

+5.0VDC

GND

PWR_OK

+5VSB

+12.0VDC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+3.3VDC

-12.0VDC

GND

PS_ON#

GND

GND

GND

-5.0VDC

+5.0VDC

+5.0VDC

ATX12V1

+12V DC +12V DC

GND GND

PSCH-SR ATX Power Connectors

10.Floppy disk drive connector (34-1 pin FLOPPY1)

This connector supports the provided floppy drive ribbon cable. After connecting one end to the motherboard, connect the other end to the floppy disk drive. (Pin 5 is removed to prevent incorrect insertion when using FDD cables with a closed pin 5 hole).

PSCH-SR

FLOPPY1

PIN 1

NOTE: Orient the red markings on the floppy ribbon cable to PIN 1.

PSCH-SR Floppy Disk Drive Connector

2-28

Chapter 2: Hardware information