Sun Microsystems SunSwift SPARCserver 1000, Service Manual

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Diagnostics and Commands for Troubleshooting 2-17
2
10. To exit the menu, press r to return to the main menu, then press r again to
return to the self test.
2.8 Interpreting System Board LEDs
If no terminal is present, inspect front panel LEDs for a POST- found problem.
Note – The middle (yellow) LED should light while POST is running, then turn
off when POST ends. In normal operation, both green LEDs should be on, and
the middle LED should be off.
If the front panel LEDs indicate a problem, look at the status LEDs on the
system boards to determine which board has the problem.
2.8.1 While POST Is Running
With the key switch in On position, POST should finish in one minute or less.
Do not use the diagnostic position; extended diagnostics take much longer and
display detail usually not useful to the field engineer.
Note – Severe hardware problems can cause POST to retry a test and the LED
codes on a board may be reset. (This situation is called a watchdog reset.) The
preferred method of using POST is with a terminal.
2.8.2 After POST Ends
After the system has booted, the left and right (green) front panel LEDs should
be lit, and the middle (yellow) LED should be off.
On system boards with SuperSPARC modules, one or two green LEDs, (PA and
PB) should be lit; all yellow LEDs should cycle in a repeating pattern.
On system boards lacking SuperSPARC modules, both green LEDs should be
off, and the yellow LEDs should be lit in a solid pattern.
Note – A system board can be installed without SuperSPARC modules to
provide additional SBus slots or serve as a memory expansion board.