IBM 436854u Service Guide - Page 31

System-board jumpers The following illustration shows the jumpers on the system board. Boot block jumper (JP6) Clear CMOS jumper (JP1) Mini-BMC force update jumper (JP3) The following table describes the function of each jumper block. Table 2. System-board jumper blocks Jumper number Jumper name Jumper setting JP1 Clear CMOS jumper v Pins 1 and 2: Keep CMOS data (default) v Pins 2 and 3: Clear the CMOS data, which clears the power-on password. Make sure that the ac power source is disconnected from the server. Note: Changing the position of this jumper does not affect the administrator password check if an administrator password is set. If the administrator password is set and forgotten, remove and then reinstall the battery. JP3 Mini-BMC force update Pins 1 and 2: Open (default). Note: You do not need to set this jumper because it stays at this setting. JP6 Boot block jumper (JP6) v Pins 1 and 2: Normal (default) v Pins 2 and 3: Recover boot block (see "Updating (flash-update) the BIOS code on the server" on page 216) Chapter 1. Introduction 13