Sun Microsystems Sun Blade 100, Service Manual

Page: 137 / 222

Chapter 8 Removing and Replacing the Motherboard and Related Components 8-5
Note –
A jumper switch is closed (sometimes referred to as shorted) with the plastic
cap inserted over two pins of the jumper. A jumper is open with the plastic cap
inserted over one or no pin(s) of the jumper. Motherboard jumpers are identified as
JP. Jumper pins are located immediately adjacent to the designation number.
FIGURE 8-2
shows examples of closed and open jumpers.
TABLE 8-1
shows the JP3
jumper configurations.
FIGURE 8-2
Example of Open and Closed Speed Setting Jumpers
9. If you removed any PCI cards, replace them.
See Section 8.4.2 “Replacing a PCI Card” on page 8-13.
10. Detach the wrist strap, replace the system cover, and power on the system as
described in Chapter 9 “Finishing Component Replacement.”
TABLE 8-1
CPU Speed Detect Jumper, JP3 Settings
Jumper Setting CPU Mode
All open A (current CPU default)
1-2 closed B
3-4 closed C
1-2, 3-4 closed D
5-6 closed E
1-2, 5-6 closed F
3-4, 5-6 closed G
1-2, 3-4, 5-6 closed H
1-2
3-4
5-6
Closed
1-2
3-4
5-6
Open
Open