ABB IRC5 Operating Manual page 64

4 Troubleshooting by unit
4.1 Troubleshooting LEDs in the controller
Continued
LED board
The function of the LEDs on the LED board are identical to those on the panel
board, see section
Should the LED board not be working, but the panel board is, the problem is the
communication between these boards or the LED board itself. Check the cabling
between them.
64
Troubleshooting the panel board on page
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70.
Operating manual - Troubleshooting IRC5
3HAC020738-001 Revision: AA