System-Board Switches And Jumpers - IBM System x3250 Problem Determination And Service Manual

System-board switches and jumpers

The following illustration shows the switches and jumpers on the system board.
The following illustration identifies the pins on a jumper and shows the location of
pin 1.
Pin 1 mark
3
2
1
Table 2. Switch and jumper settings
Component
CMOS jumper (JP3)
Boot block jumper (JP4)
NMI (non-maskable
interrupt) switch (SW1)
NMI switch
Settings
v Pins 1 and 2: Keep CMOS data (default)
v Pins 2 and 3: Clear the CMOS data, which clears the
power-on password and administrator password
v Pins 1 and 2: Normal (default)
v Pins 2 and 3: Recover boot block
v Normal (default): No NMI issued
v The NMI button that is on the rear of server, connected to
this switch, has been pressed: NMI issued
Clear CMOS jumper
Boot block
recovery jumper
7
Chapter 1. Introduction