Digital Equipment DEC 3000 600 AXP, Service Information

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LED Codes
If the system does not enter console mode (>>>), or if the hex
code DD is not displayed on the LEDs, then use Table 10–5 to
isolate the failed FRU. Take the following action in the order
listed.
1. Reseat the I/O module and system module.
2. If thickwire is selected, you must use a thickwire 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, or the system must be
connected to the network through the 10BASET port.
Table 10–5 NI LED Error Codes
LED Codes
50 51 52
53 54 55
56 57 58
59 5A
ISDN LED
Codes
The following LED codes represent continued power-up testing.
If an error occurs during this testing sequence, the system
hexadecimal code plus FRU and error code information appear
on the screen.
If the system enters console mode, then run the ISDN diagnostics
and interpret the error information using:
• SHOW ERROR command
• Diagnostic information (Chapter 9)
• Diagnostic error messages (Chapter 14)
If the system does not enter console mode (>>>), or if the hex
code DD is not displayed on the LEDs, then use Table 10–6 to
isolate the failed FRU. Take the following action in the order
listed.
1. Reseat the I/O module and system module.
2. Make sure a handset (microphone/speaker) is connected.
10–8