Module Self Tests; Processor Stack - HP 9020 CE Handbook

5-10
9020 Diagnostics
Module Self Tests
Module self tests are contained in the replaceable modules and are initiated on powerup. (The
BASIC language system SCRATCH ALL or LOAD BIN command causes aU module self tests
except the processor stack tests to be executed. No equivalent HP-UX commands exist.) Successful
completion of most tests is indicated by an LED turning on and then off. Because aU modules are
tested qUickly and the LEDs are located in various places on the 9020, you must run the test for
I
each module you wish to check.
Processor Stack
Each finstrate has its own self test. Results are indicated by twelve LEDs associated with card slots 1
through 12. The LEDs are visible by removing the left cosmetic door and looking through the
window in the stack door. Normal operation is all LEDs on, foUowed one or two seconds later by aU
LEDs off. An LED that won't turn on or that turns on and won't turn off indicates a failure of the
corresponding finstrate.
Processor Stack Self Test LEOs
Keyboard
Processor Stack
Self Test LEOs
This self test turns the CAPS LED on and off and turns the PRINT ALL LED on at powerup. The
BASIC system then turns the PRINT ALL LED off and the CAPS LED back on. The HP-UX
system turns both PRINT ALL and CAPS off.
Printer
An LED on the printer's logic board lights when its module self test detects a failure. The LED is
visible through the air vents under the keyboard.