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Installing and Replacing Desktop Board Components

Pin Standard Signal Name ECP Signal Name EPP Signal Name

23 PERROR PE, ACKREVERSE# PE

24 GROUND GROUND GROUND

25 SELECT SELECT SELECT

26 KEY (no pin) KEY (no pin) KEY (no pin)

Alternate Front Panel Power LED Header

Figure 23, E shows the location of the alternate 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. If

your chassis has a three-pin power LED cable, connect it to this header. Table 9

shows

the pi

n assignments for the alternate front panel header.

Table 9. Alternate Front Panel Power LED Header Signal Names

Pin Signal Name In/Out

1 Front panel LED+ Out

2 No pin

3 Front panel LED- Out

Front Panel Header

Figure 23, F shows the location of the front panel header. Table 10 shows the pin

assignments and signal names for the front panel header.

Table 10. Front Panel Header Signal Names

Pin Description In/Out

Hard Drive Activity LED Power LED

1 Hard disk LED pull-up to +5 V

Out 2 Front panel LED+ Out

3 Hard disk active LED Out 4 Front panel LED- Out

Reset Switch On/Off Switch

5 Ground 6 Power switch In

7 Reset switch In 8 Ground

Power Not Connected

9 Power Out 10 No pin

NOTE

When connecting individual wires from your chassis front panel to the front panel

header, be sure to observe the connection polarity. Positive wires are usually

solid color and negative wires are usually white or striped.

Intel BLKDH55TC User Manual

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