System-Board Leds - IBM System x3550 M3 Type 4254 Installation And User Manual

Table 8. System board SW4 switch block definition (continued)
Switch
number
2
3
4
Important:
1. Before you change any switch settings or move any jumpers, turn off the
server; then, disconnect all power cords and external cables. Review the
information in "Safety" on page v, "Installation guidelines" on page 43,
"Handling static-sensitive devices" on page 46, and "Turning off the server" on
page 33.
2. Any system-board switch or jumper blocks that are not shown in the
illustrations in this document are reserved.

System-board LEDs

The following illustration shows the light-emitting diodes (LEDs) on the system
board.
Default position
Off
Off
Off
Description
When you toggle this switch On and
then Off, you force a power-on,
which overrides the power-on and
power-off button on the server and
they become nonfunctional.
(Trained service technician only)
Forced power permission. Changing
the position of this switch overrides
the IMM power-on checking process.
Reserved.
Chapter 2. Installing optional devices
41