Technical data

5-1
~ ________________ ~IICM5~~1
_ 9050 Diagnostics .
Reset Self-test 110 Card Processor Status
Switch Switch
Cage LEDs Stack Leds LEDs
Front Panel LEOs and Switches
Diagnostics Overview
Self-tests run:
• At power on.
• Self-test switch pressed.
• Self-test switch pressed for 3.5 seconds. Press switch again, or cycle power, to terminate the
self-test loop.
Board Self-Tests
The board self-tests reside on each stack board and 110 board that has a microprocessor. The tests
are initiated before the boot loader
is transferred to the RAM, and are not dependent on the loader.
The system control module generates the self-test initiation signals.
When a board
fails, the sequence stops and the corresponding stack LED is lit. The board before or
after the indicated board may be bad disrupting the initiating signal. Some failures will cause several
LEOs to tum on. The faulty board is the one corresponding to the lowest numbered lit LED. LEOs
that correspond to 1M byte RAM boards will blink while the board is performing its self-test.
If the RAM memory controller is bad, the appropriate LED will light and the self-test will stop.
If an 110 board fails its self-test, an LED on the I/O board will light, and a status signal will be made
available for the loader code to respond to during loader self-tests. Some 110 cards do not have
self-tests (the
GPIO for example).