Removing The Main Logic Board - Sun Microsystems SPARC classic Service Manual

e. Use the commands shown below to set the diagnostic switch to True, set the
autoboot switch to False, and reset the system.
ok setenv diag-switch? true
ok setenv auto-boot? false
ok reset
As the POSTs run, view the results on the terminal screen.
f. If all POSTs pass, go to step 5. Otherwise, proceed as follows:
i. If the Limited Main Memory Address Test fails, the "U" number of the
ii. If any other POST fails, or the system appears dead, replace the main logic
g. If you replaced the main logic board or a DSIMM, return to step 3 of this
procedure.
4. If you still have not identified the problem, go to the next step. Otherwise, skip
ahead to step 7.
5. Run the SunDiagnostic Executive with the cache disabled.
The SunDiagnostic Executive is an independent operating system. It runs exhaustive
subsystem tests independent of your system's normal operating system. See the
SunDiagnostic Executive User's Guide for Desktop SPARCstations.
6. At the > or ok prompt, turn off the system's power switch.
7. Disconnect the terminal and reconnect the graphics monitor, keyboard, and
Ethernet connector.
See the Desktop SPARC Hardware Owner's Guide or Using a SPARCclassic X Terminal
for installation instructions.
11.4.3

Removing the Main Logic Board

This section explains how to remove a faulty main logic board from the system unit.
11-24 SPARCclassic/SPARCclassic X/SPARCstation LX Service Manual • November 1993
faulty DSIMM is displayed on the terminal. Replace the defective DSIMM
using Section 11.3 "DRAM Single In-line Memory Modules (DSIMMs)" on
page 11-10.
board. The appropriate removal/replacement procedures in Section 11.1
"SBus Cards."