Technical data

Overview and Updates
LED Codes
The LED code information in Chapter 5 (pages 5-2 −5-14) of the DEC 3000 Models
600/600S AXP and 800/800S AXP Service Information has been corrected on pages 1-5−
1-19 of this addendum. These corrections supersede the LED information in Chapter 5 of
DEC 3000 Models 600/600S AXP and 800/800S AXP Service Information.
If the system enters console mode, execute diagnostics and interpret the error information
using the SHOW ERROR command described in Chapters 4 and 14 of the DEC 3000
Models 600/600S AXP and 800/800 AXP Service Information (EK
−
FLSPC
−
SV).
An LED display indicates the diagnostic currently being executed when the unit is first
powered on. If an error occurs before the system enters console mode, the failed test is
identified on this display.
On the Model 900 system, this display consists of two LEDs on the front of the unit, which
represent two hexadecimal digits. On the Model 700 system, this display consists of a row
of eight LEDs on the rear of the unit. The eight LEDs correspond to eight binary bits,
which can be grouped to form two four−bit bytes.
Use the diagnostic LEDs to help diagnose problems when the system is unable to set up
the console. This portion of the testing does not appear on the monitor.
__________________________ Note_____________________________
In the tables containing LED codes, • indicates that an LED is on; o
indicates that an LED is off.
All changes from Chapter 5 of the service information manual appear in
bold within the tables.
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