Self-Test Diagnostic

The CPU Self-Test runs in either the Normal or Diag mode. Set the CPU DIAG/NORM switch to DIAG or set the diag-switch? NVRAM parameter to true to enable the Diag mode.

In the Normal mode, the CPU runs through a basic set of tests and reports errors on the diagnostic LEDs. Refer to the appropriate Field Service Manual and the Troubleshooting Section of this Handbook for self-test LED error code information.

When the CPU is set to the Diag mode, the self-tests are more extensive than in the Normal mode and include a complete memory check. Connect an ASCII terminal to port A to display the self-test output when the system is in Diag mode. Use full duplex, 9600 baud, XON/XOFF, 8bits/1 stop bit, and no parity with a null modem type cable.

On Sun-4 systems, enter "x" at the PROM Monitor prompt to display the Extended Diagnostics menu. At the prompt select a test for execution. To return to the PROM Monitor, enter "q".

Some tests were removed from the 2.8 EPROM in November 1988 to make room for more boot and display device drivers. With the 2.8 EPROM, boot path tests are executed directly from the PROM Monitor prompt using the command:

>b*device()

On systems with the Open Boot PROM, use the help command to display a list and description of available tests.

ok help diag