Usb daughter card – NCR 7458 User Manual

Page 60

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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:.

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