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3-36 Chapter 3: Hardware Service
USB Daughter Card
The USB Daughter Card provides powered USB connectors for
peripheral support.
Self-Healing Fuses: Each of the USB ports are fuse protected. The 24V
port uses a standard replaceable fuse. The 12V ports use Self-Healing
Fuses. If the current flow exceeds the fuse capacity, the fuse opens the
circuit. Once the cause of the excessive current draw (short, bad
peripheral etc) is removed, the fuse material cools down, and in few
seconds the fuse closes.
20372
24V USB
12V USB
Mic
Audio
F4, 3 A, 125 V
CD-ROM Audio
USB Power
USB Interface
PC Beep
Controller Ports
• Ports C & B are controlled by the USB controller at Bus 0, Device 7,
Function 2
• Ports A & 24V are controlled by the USB controller at Bus 0, Device
7, Function 3
Note: The USB controller can be disabled in BIOS Setup under the
Advanced menu, in the OnChip Multi-function Device menu. It is
identified as OnChip USB 2 Device:.