Table 4. System board SW4 switch block definition (continued)
Switch
number Default position Description
2 Off 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.
3 Off (Trained service technician only)
Forced power permission. Changing
the position of this switch overrides
the IMM power-on checking process.
4 Off Reserved.
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 vii, “Installation guidelines” on page 167, “Handling
static-sensitive devices” on page 169, and “Turning off the server” on page 15.
2. Any system-board switch or jumper blocks that are not shown in the illustrations
in this document are reserved.
20 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide
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