Intel Desktop Board DQ77MK Technical Product Specification
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2.2.2.4 Front Panel Header
This section describes the functions of the front panel header. Table 30 lists the signal
names of the front panel header. Figure 12 is a connection diagram for the front panel
header.
Table 30. Front Panel Header
1 HDD_POWER_LED Pull-up resistor
(750 Ω) to +5V
2 POWER_LED_MAIN [Out] Front panel LED
(main color)
3 HDD_LED# [Out] Hard disk
activity LED
4 POWER_LED_ALT [Out] Front panel LED
(alt color)
5 GROUND Ground 6 POWER_SWITCH# [In] Power switch
7 RESET_SWITCH# [In] Reset switch 8 GROUND Ground
9 +5V_DC Power 10 Key No pin
Figure 12. Connection Diagram for Front Panel Header
2.2.2.4.1 Hard Drive Activity LED Header
Pins 1 and 3 can be connected to an LED to provide a visual indicator that data is
being read from or written to a hard drive. Proper LED function requires a SATA hard
drive or optical drive connected to an onboard SATA connector.
2.2.2.4.2 Reset Switch Header
Pins 5 and 7 can be connected to a momentary single pole, single throw (SPST) type
switch that is normally open. When the switch is closed, the board resets and runs the
POST.
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