Appendix A: System Board Jumpers
175
Changing a jumper setting
The short general procedure for changing a configuration setting is the
same for most of the jumper functions, so it is described here.
1.
Observe the safety and ESD precautions at the beginning of “Static
electricity precautions” on page 2.
2.
Turn off all connected peripherals, turn off system power, and
disconnect all AC power cords.
3.
Remove the access cover.
4.
Remove the foam insert from the electronics bay.
5.
Locate the configuration jumpers at the edge of the system board
toward the front of the system (see the illustration System Board
Jumpers on page 174).
6.
Move the jumper to the pins specified for the desired setting.
Jumper Settings
Function
Pins
What it Does at System Reset
CMOS clear
1-2, Normal
Preserves the contents of the NVRAM
2-3, Forced erase
Replaces the contents of the NVRAM with
the manufacturing default settings
Password clear
5-6, Protect
Maintains the current passwords
6-7, Erase
Clears the passwords
Recovery boot
9-10, Normal
System boots using the BIOS stored in
flash memory
10-11, Recovery
BIOS tries a recovery boot, loading BIOS
code from a diskette into the flash device.
Use this jumper when the BIOS code has
been corrupted by a failed flash update.
To Change a Jumper Setting
Note:
You do not need to remove
the system board from the
chassis, and you probably
do not need to remove any
expansion cards.
9250R.book Page 175 Friday, April 9, 1999 9:44 AM
Summary of Contents for ALR 9250R
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