Locating A Failing Simm; Jumper Configuration - Sun Microsystems SPARCserver 1000 Service Manual

B.1.2 Locating a Failing SIMM
B.2 Jumper Configuration
Label Jumper
J1200 Pins 2, 3
J1201 Pins 2, 3
J1100 Pin 1 to ground
J1101 Pin 1 to ground
Table B-1 SIMM Group Organization
Group
Group 0
Group 1
Group 2
Group 3
When a SIMM (or NVSIMM) fails during Power On Self-Test (POST), the
SIMM slot number (J-number) and system board card cage slot number can be
learned by using the prtdiag command. Refer to Section 3.2, "Using
prtdiag" for instructions.
Note – Jumpers are factory set and should not be changed except for use with
factory diagnostic equipment and software.
Use Table B-2 and Figure B-2 to verify jumper settings are correct. Pin 1 of each
location is identified by a square solder pad.
Table B-2 System Board Jumpers
Default Setting Function
In Connects +12V to RS232 line driver. (Pin 1 = ground, pin 2 = line
driver input, pin 3 = +12 V supply.) Used to power the RS232 ports.
In Connects –12V to RS232 line driver. (Pin 1 = ground, pin 2 = line driver
input, pin 3 = –12 V supply.) Used to power the RS232 ports.
Out Holds processor A in reset so the other processor can be tested.
Out Holds processor B in reset so the other processor can be tested.
SIMMs and Jumpers
Location
J2800, J2900, J3000, J3100
J3200, J3300, J3400, J3500
J3600, J3700, J3800, J3900
J4000, J4100, J4200, J4300
B
B-3