Hardware Description
2–9
Diagnostics Display Mode (DIAG)
When this function is enabled, the diagnostic display mode indicates that the system is in
diagnostic mode. (Refer to the previous Configure Button section in this chapter for
information on setting the display mode.)
After powerup, the DEL8X automatically performs a self–diagnostic test. This test is done
in two stages: the first stage is the system diagnostic test; the second stage is the port
diagnostic test. If a problem is detected, the current diagnostic process (system or port test)
will continue until completed. If the test does not complete successfully, the corresponding
LEDs (described in the following table and sections) will flash after test completion to
indicate which component failed the test.
__________________________ Note _____________________________
Enabling the Diagnostic function activates tests similar to the one performed
upon powerup. After successfully completing diagnostics, the system returns to
normal operation.
____________________________________________________________
System Diagnostic Test
The following table describes the system–level failures and corresponding LEDs. If a
problem is detected, failure indications will appear in row 9.
LED (Column, Row)
Color
Component Tested
1, 9
Red
System ROM
2, 9
Red
System RAM
3, 9
Red
System EEPROM