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100 Technical Reference
Table 11. Server Board Jumper Summary (continued)
Jumper Block Jumper Name Pins (default in bold) What it does at system reset
J2J1 CMOS CLR 1-2, Protect Preserves the contents of NVRAM.
2-3, Erase Replaces the contents of NVRAM with the
manufacturing default settings.
J2J1 PSWD CLR 5-6, Protect Maintains the current system password.
6-7, Erase Clears the password.
J2J1 RCVRY BOOT 9-10, Normal System attempts to boot using the BIOS
stored in flash memory.
10-11, Recovery BIOS attempts a recovery boot, loading
BIOS code from a floppy diskette into the
flash device. This is typically used when the
BIOS code has been corrupted.
J2J1 BIOS WR EN 13-14, Protect BIOS boot block is write-protected.
14-15, Erase/Program BIOS boot block is erasable and
programmable.
General Procedure to Change Jumper Setting
The short general procedure for changing a configuration setting is the same for most of the jumper
functions, so we will describe it here.
1. Observe the safety and ESD precautions at the beginning of this chapter.
2. Turn off all connected peripherals, turn off system power, and disconnect the AC power cord.
3. Remove the side cover. You do not need to remove the server board from the chassis, and you
probably do not need to remove any add-in boards.
4. Locate the configuration jumpers at the edge of the server board toward the front of the system.
5. Move jumper to pins specified for the desired setting.
6. Reinstall the side cover, connect the power cord, and turn on the system for the change to take
effect.
7. You may need to repeat these steps to move the jumper back to its original setting, depending
on the jumper function.