Sun Microsystems 280R manual About the Main Logic Board Jumpers

About the Main Logic Board Jumpers

The jumpers on the main logic board affect the operation of the flash PROM located on the main logic board. For information about the flash PROM jumper settings, see “About Flash Permanent Read Only Memory (PROM) Jumpers” on page 114.

Modifying jumper settings should only be performed by a qualified service provider. For more information about changing jumper settings, see the Sun Fire 280R Server Service Manual.

Jumpers are marked on the main logic board with jumper addresses. For example, the serial port jumper is marked J2103. Jumper pins are located immediately adjacent to the jumper address. Pin 1 is marked with an asterisk (*) in one of the positions shown below.

J X X X X

*

*

*

	Jumper address
	Pins
*			Asterisk indicates pin 1
		*
*

112 Sun Fire 280R Server Owner’s Guide • January 2001