Service manual

D
Diagnostic LEDs Definitions
This appendix defines the eight LEDs on the back of the system box
during each phase of the testing and power-up initialization. The LEDs
are divided into two fields. The first four LEDs indicate the current state
of the system and the second set of four depend on the previous four.
There are sixteen possible combinations for each set of LEDs. The four
LEDs that indicate the state of the system have the following definitions.
The other four LEDs have another meaning as indicated in Table D–1.
The number 1 indicates the LED is lit.
Table D–1 Diagnostic LEDs Definitions
State Substate Definitions Recommendations
1111 1111 Power is applied but no
instruction is executed.
See Section D.1
1111 0000 Power is applied. The ROM
code is successfully started
and several instructions
have been executed.
See Section D.1
1110 0000 Console memory sizing
routine is entered. Memory
to hold the console data
structures is located. The
substate variables have no
meaning in this section of
the test.
See Section D.1
1101 0000 The console data structures
are initialized and have
started testing the NVR.
See Section D.1
1100 0000 The NVR test completed
and the DZ test has started.
See Section D.1
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