Sun Microsystems Ultra 5, Service Manual

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Appendix C Functional Description C-37
C.7 Jumper Descriptions
Jumper configurations can be changed by setting jumper switches on the
motherboard. The motherboard’s jumpers are preset at the factory.
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. The following figure shows the different jumper
settings that are used on the motherboard.
FIGURE C-17
Selected Jumper Settings
Jumper descriptions include brief overviews of serial port jumpers, flash PROM
jumpers, and additional system board jumper and connector blocks.
Jumpers are identified on the system board by J designations. Jumper pins are
located immediately adjacent to the J designator. Ensure that the serial port jumpers
are set correctly.
FIGURE C-18
Identifying Jumper Pins
Closed
Open
2-3
1
1-2
1
Pins
Part number
J PX X