About Hardware Jumpers - Sun Microsystems Fire V890 Service Manual

About Hardware Jumpers

The hardware jumpers in the Sun Fire V890 server have the following functions:
J2902 and J2903 on the system I/O board are used to configure the serial ports for
■
either EIA-423 or EIA-232D operation. For information about the EIA-423 and
EIA-232D jumper settings, see
J3002, J3003, and J3004 are used to affect the operation of the OpenBoot flash
■
PROM located on the system I/O board. See
page
J01701, J01003, and J0803 are used to affect the operation of the flash PROM
■
located on the FC-AL disk backplane. See
page
Caution – All internal jumper modifications must be performed only by qualified
service personnel.
Caution – Do not change the configuration of J0501 and J0502 on the system
controller card from the default settings; otherwise, the system controller card will
not boot.
All jumpers are marked with identification numbers. For example, the serial port
jumpers on the system I/O board are marked J2902 and J2903. Jumper pins are
located immediately adjacent to the identification number. The default jumper
positions are indicated with shaded regions. Pin 1 is marked with an asterisk (*) in
any of the positions shown below.
J 2XXX
*
*
*
240 Sun Fire V890 Server Service Manual • October 2005
242.
242.
Jumper number
Pins
*
*
"About Serial Port Jumpers" on page
"About Flash PROM Jumpers" on
"About Flash PROM Jumpers" on
Asterisk indicates pin 1
*
Shaded region indicates
default jumper position
241.