Technical data

Overview and Updates
Table 1-13 ISDN LED Codes Action Table
Step Action
1 Reseat I/O module and system module.
2 Replace I/O module.
3 Make sure a handset is connected.
4 Make sure that the audio module cable is connected to the
I/O module.
5 Replace Audio Module (M800/M800S/M900)
SCSI LED Codes
The SCSI LED codes represent continued power-on and extended self-test testing. If an
error occurs during this testing sequence, a hexadecimal code appears with FRU and error
code information on the monitor screen.
If the system does not enter console mode (>>>) or if hex code DD is not displayed on the
LEDs, use Tables 1-14 and 1-15 to isolate the failed FRU.
1-16