Sun Microsystems Ultra 1 140 Service Manual page 33

3.1 How to Start POST
Power-On Self-Test (POST)
The Power On Self Test (POST) diagnostics reside in the system's OpenBoot
PROM located on the system board. These diagnostics are useful in
determining if a portion of the system has failed and should be replaced.
Under normal operating conditions, POST does not run automatically when
the system is powered on.
How to Start POST
Max and Min Levels of POST
POST Progress and Error Reporting
Additional Keyboard Control Commands
System and Keyboard LEDs
Serial Port A POST Output
POST can be started in two ways. Before powering up the system, press and
hold the Stop and D keys on the keyboard. With these keys pressed, turn the
system on by pressing the keyboard power on key, or press the power on
switch at the rear of the system. This causes the system to start running the
POST diagnostics. While POST is running, the Caps Lock key on the keyboard
should flash on and off.
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