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Proper LED function requires a SATA hard drive or optical drive connected to an onboard SATA connector, or the use of an Intel Z-U130 Solid-State Drive (or compatible device). Technical Reference 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. 2.2.2.4.3 Power LED Header Pins 2 and 4 can be connected to a one- or two-color LED. Table 26 shows the default states for this LED. More options are available through BIOS setup. Table 26. States for a One-Color Power LED LED State Description Off Power off/sleeping Steady Lit Running Blink Standby 2.2.2.4.4 Power Switch Header Pins 6 and 8 can be connected to a front panel momentary-contact power switch. The switch must pull the SW_ON# pin to ground for at least 50 ms to signal the power supply to switch on or off. (The time requirement is due to internal debounce circuitry on the board.) At least two seconds must pass before the power supply will recognize another on/off signal. 2.2.2.5 Auxiliary Front Panel Power LED Header Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel header. Table 27. Auxiliary Front Panel Power LED Header Pin Signal Name In/Out Description 1 FP_LED+ Out FP_LED+ 2 Not connected 3 FP_LED. Out FP_LED. Intel Desktop Board DH55HC Technical Product Specification 2.2.2.6 Front Panel USB Headers Figure 12 is a connection diagram for the front panel USB headers. NOTE • The +5 V DC power on the USB headers is fused. • Use only a front panel USB connector that conforms to the USB 2.0 specification for high-speed USB devices. Figure 12. Connection Diagram for Front Panel USB Headers Figure 13. Connection Diagram for Front Panel USB Header (with Intel Z-U130 USB Solid-State Drive, or Compatible Device, Support) Technical Reference 2.3 Jumper Block CAUTION Do not move the jumper with the power on. Always turn off the power and unplug the power cord from the computer before changing a jumper setting. Otherwise, the board could be damaged. Figure 14 shows the location of the jumper block. The 3-pin jumper block determines the BIOS Setup program’s mode. Table 28 describes the jumper settings for the three modes: normal, configure, and recovery. Figure 14. Location of the Jumper Block Intel Desktop Board DH55HC Technical Product Specification Table 28. BIOS Setup Configuration Jumper Settings Function/Mode Jumper Setting Configuration Normal 1-2 The BIOS uses current configuration information and passwords for booting. Configure 2-3 After the POST runs, Setup runs automatically. The maintenance menu is displayed. Note that this Configure mode is the only way to clear the BIOS/CMOS settings. Press F9 (restore defaults) while in Configure mode to restore the BIOS/CMOS settings to their default values. Recovery None The BIOS attempts to recover the BIOS configuration. A recovery CD or USB flash drive is required. Technical Reference 2.4 Mechanical Considerations 2.4.1 Form Factor The board is designed to fit into an ATX form-factor chassis. Figure 15 illustrates the mechanical form factor for the board. Dimensions are given in inches [millimeters]. The outer dimensions are 9.60 inches by 11.60 inches [243.84 millimeters by 294.64 millimeters]. Location of the I/O connectors and mounting holes are in compliance with the ATX specification. Figure 15. Board Dimensions Intel Desktop Board DH55HC Technical Product Specification 2.5 Electrical Considerations 2.5.1 Power Supply Considerations CAUTION The +5 V standby line from the power supply must be capable of providing adequate +5 V standby current. Failure to do so can damage the power supply. The total amount of standby current required depends on the wake devices supported and manufacturing options. Additional power required will depend on configurations chosen by the integrator. The power supply must comply with the indicated parameters of the ATX form factor specification. • The potential relation between 3.3 VDC and +5 VDC power rails • The current capability of the +5 VSB line • All timing parameters • All voltage tolerances For example, for a system consisting of a supported 95 W processor (see Section 1.4 on page 14 for information on supported processors), up to 16 GB DDR3 memory, integrated graphics, one hard disk drive, one optical drive, and all board peripherals enabled, the minimum recommended power supply is about 340W with current ratings as listed in Table 29. Table 29. Recommended Power Supply Current Values Output Voltage 3.3 V 5 V 12 V1 12 V2 -12 V 5 VSB Current 5 A 16 A 10 A 10 A 0.1 A 0.5 A NOTE +12 V1 denotes the 12 V rail at the 2 x 12 power header +12 V2 denotes the 12 V rail at the 2 x 2 power header For information about Refer to Selecting an appropriate power supply S-026472.htm Technical Reference 2.5.2 Fan Header Current Capability CAUTION T...