I n s i d e t h e S y s t e m U n i t
Changing the Jumper settings
Do not alter any jumper or switch settings other than those identified
here, unless told to by your supplier or an authorized maintainer.
Otherwise, you may damage the system processor, the motherboard or
There are only a few jumpers on the motherboard that you may
need to alter. All others are set at the factory and should not be
In this section, "1-2" means the jumpers should be fitted across pins
1 and 2, "2-3" means the jumper should be fitted across pins 2 and
3, and so on. "Open" means that no jumpers should be fitted;
"Closed" means that all jumpers should be fitted.
On the motherboard, pin 1 of each block is indicated by a small
LS/VS 550 OWNER'S HANDBOOK
PL3, PL4, PL6,