Digital Equipment DEC 3000 Series Service Information page 181

Power-Up LED Error Codes,
ISDN LED
Codes
Table 6–13 NI LED Action Table
Step Action
1 Reseat the I/O module and system module.
2 If thickwire is selected, you must use a loopback
connector, or the system must be connected to the
network through the Thickwire port.
If 10BaseT is selected and the diagnostic environment
is service mode, you must connect a 10BaseT loopback
connector.
The following LED codes represent continued power-up testing. If
an error occurs during this testing sequence, the system displays
a hexadecimal code plus FRU and error code information on the
screen.
If the system enters the console program, then run the NVR
diagnostics and interpret the error information using

SHOW ERROR command

Diagnostic information (Chapter 4)

Diagnostic error messages (Appendix C)
If the unit does not enter the console program (>>> prompt
displayed on monitor or DD code displayed on the LEDs), then
use Tables 6–14 and 6–15 to isolate the failed FRU.
Continued
Continued on next page
6–13