Installing and Replacing Desktop Board Components
45
To restore back panel audio, follow these steps:
1. Observe the precautions in "
Before You Begin" on page 25.
2. Turn off all peripheral devices connected to the computer. Turn off the computer
and disconnect the AC power cord.
3. Remove the cover.
4. Remove the front panel audio cable.
5. Replace the cover.
Connecting to the USB 2.0 Headers
Before connecting to the USB 2.0 headers, observe the precautions in "Before You
Begin" on page
25. See Figure 20, B on page 43 for the location of the black USB 2.0
header.
Table 7 shows the pin assignments for each USB 2.0 header.
Table 7. USB 2.0 Header Signal Names
USB Port A USB Port B
Pin Signal Name Pin Signal Name
1 Power (+5 V) 2 Power (+5 V)
3 D- 4 D-
5 D+ 6 D+
7 Ground 8 Ground
9 Key 10 No Connect
Note: USB ports may be assigned as needed.
Connecting to the Front Panel Header
Before connecting to the front panel header, observe the precautions in "Before You
Begin" on page
25. See Figure 20, C on page 43 for the location of the multi-colored
front panel header.
Table 8 shows the pin assignments for the front panel header.
Table 8. Front Panel Header
Pin Description In/Out Pin Description In/Out
Hard Drive Activity LED Power LED
1 Hard disk LED pull-up to +5 V Out 2 Front panel green LED Out
3 Hard disk active LED Out 4 Front panel yellow 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
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