Sun Microsystems SPARCstation 2 Service Manual page 102

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14. Turn on the system and the terminal.
The system will start to boot. To interrupt the boot sequence, press L1-A on
the system keyboard.
The default prompt is the > prompt. You can reset the default prompt to
be the ok prompt. To make the default prompt the ok prompt, see the
Open Boot PROM 2.0 Toolkit User's Guide.
If you see the ok prompt, go to step 15. If you see the > prompt, go to
the next step.
15. At the > prompt, enter n.
16. This enters the Forth Toolkit and displays its ok prompt.
17. 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 POST tests run, view the results on the keyboard LEDs located on the
upper right corner of your keyboard. Figure 2-4 shows the meaning of the
LED display pattern.
18. If all POST tests pass, go to the next step.
If one or more of the following POST tests fails, take one of the following
actions:
If the PROM fails, replace the boot PROM. See "Boot PROM" later in this
°
chapter.
If you replace the Boot PROM and re-run the POST and the PROM test
°
fails again, a component between the CPU and the boot PROM on the
main logic board is defective. Reinstall the original boot PROM. See "Boot
PROM" later in this chapter. Remove and replace the main logic board.
See "Removing the Main Logic Board" and "Replacing the Main Logic
Board" later in this chapter.
If a SIMM fails, the slot number of the failing SIMM may be indicated by
°
keyboard LED display, but only if the SIMM belongs to bank 0 (see
Figure 2-4). The other twelve SIMM Slots will be tested by the POST
memory diagnostics and errors will be reported. Memory error messages
on the system monitor display usually include a physical memory address
SPARCstation 2 Field Service Manual—February 1991
the system is rebooted and POST is run