Filter
Top Products
Appendix A 173
LED codes
CUB detected I/O error
CUB detected I/O error
This section describes I/O errors detected by the monitoring utilities chip
(MUC) on the core utilities board after power-on.
Table 18 CUB detects I/O (IOB) power fail
LED Fault Symptoms Corrective action
58 Left Front
I/O Board failure
1. 3.3V or 5V dropped below
acceptable level (+12V and
-12V not monitored).
2. Core utilities board (CUB)
detected a power loss on
reported I/O board (IOB).
3. Core utilities board (CUB)
powers down the system.
Call the Response
Center.
59 Left Rear
I/O Board failure
5A Right Front I/O
Board failure
5B Right Rear
I/O Board failure