Biostar B250MHC, Manual

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14 | Chapter 2: Hardware installation
2.7 Headers & Connectors
ATXPWR1: ATX Power Source Connector
For better compatibility, we recommend to use a standard ATX 24-pin power supply for this
connector. Make sure to find the correct orientation before plugging the connector.
Pin Assignment Pin Assignment
13 +3.3V 1 +3.3V
14 -12V 2 +3.3V
15 Ground 3 Ground
16 PS_ON 4 +5V
17 Ground 5 Ground
18 Ground 6 +5V
19 Ground 7 Ground
20 NC 8 PW_OK
21 +5V 9 Standby 5V
22 +5V 10 +12V
23 +5V 11 +12V
24 Ground 12 +3.3V
ATXPWR2: ATX Power Source Connector
The connector pr12V to the CPU power circuit.
Pin Assignment
1
+12V
2 +12V
3 Ground
4 Ground
Note
»
Before you power on the system, please make sure that both ATXPWR1 and ATXPWR2 connectors
have been plugged-in.
»
Insufficient power supplied to the system may result in instability or the peripherals not functioning
properly. Use of a PSU with a higher power output is recommended when configuring a system with
more power-consuming devices.
PANEL1: Front Panel Header
This 16-pin header includes Power-on, Reset, HDD LED, Power LED, and speaker connection.
Pin Assignment Function Pin Assignment Function
1 +5V
Speaker
Connector
9 N/A
N/A
2 N/A 10 N/A
3 N/A 11 N/A N/A
4 Speaker 12 Power LED (+)
Power
LED
5 HDD LED (+) Hard drive
LED
13 Power LED (+)
6 HDD LED (-) 14 Power LED (-)
7 Ground Reset
button
15 Power button Power-on
button 8 Reset control 16 Ground