Power-On Self-Test - Sun Microsystems SPARCstation 5 Service Manual

Diagnostic Tools
TABLE 2–3
Diagnostic Tool When or Why to Use the Tool
Power-On Executes automatically at power-on when Stop-d keys are pressed or
Self-Test (POST) when the diag-switch? parameter is set to true. The POST code
resides in the boot PROM and is driven by the POK signal from the power
supply. POST tells you if there is a problem with the system board, the
NVRAM, or the DSIMMs. See "Power-On Self-Test (POST)" on page 19."
FORTH Tests functions such as the Ethernet and SCSI interfaces, system memory,
Diagnostics and the diskette drive controller. You must be at the ok prompt (the
FORTH Monitor) to run the FORTH Diagnostics. The FORTH Diagnostics
reside in the boot PROM.
FORTH Monitor Allows input to the system at the boot PROM level. Supports functions
such as changing NVRAM parameters, resetting the system, running
diagnostic tests, displaying system information, and redirecting input and
output. See the OpenBoot Command Reference for more information.
SunDiag Runs under the operating system. It displays real-time use of the system
System resources and peripherals. The SunDiag System Exerciser tells you if your
Exerciser system is functioning correctly. If SunDiag fails, run the Power-On
Self-Test. If all Power-On Self-Tests pass, then run the SunDiagnostic
Executive to identify the problem. See the SunDiag User's Guide for more
information.
SunDiagnostic Runs extensive, configurable subsystem tests that are independent of the
Executive operating system. Run the SunDiagnostic Executive if all tests pass when
you run the POST. Running the SunDiagnostic Executive allows you to
determine which customer replaceable unit needs to be replaced. See the
latest version of SunDiagnostic Executive User's Guide for the
SPARCstations for more information.

Power-On Self-Test

For information about the POST, see Chapter 3.
Troubleshooting Overview
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