Compaq AlphaServer GS60 Operation Manual page 139

Following power-up and system reset, the system performs testing. Self-test results are
indicated by the following:
•
Fault light on the control panel
•
Self-test LEDs on the modules
•
Self-test display
During system self-test, the yellow Fault light on the control panel lights. If a module
fails self-test, the Fault light remains lit. If all modules pass self-test, the Fault light
goes off.
Each CPU, memory, and I/O adapter module has a green LED that lights when the
module passes self-test. These LEDs can be viewed through the module enclosure
from the front and rear (AlphaServer 8400 only) of the cabinet when the doors are
open. If a module fails self-test, its green LED does not light. Although a dual-
processor module's green LED will light only when both processors pass self-test, it is
still possible to use the module if there is a – in the self-test display for one of the
CPUs.
Some PIU modules have LEDs: the XMI DWLMA and clock card, the Futurebus+
DWLAA, and the PCI DWLPA/DWLPB I/O module. The AlphaServer 8200/8400
Service Manual describes their use.
The self-test display is discussed in detail in this chapter.
System Troubleshooting 6-17