The official explanation for this error message tells you:
Meaning:
A static discrepancy does exist between the outputs of both cutting circuit channels (HK and IAR). LED`s V2 and V3 on the board KK (supervisor) are lit up permanently.
Remedy:
Check the fuse holder for fuse F4.
- It is on the left side where the big transformer for the power supply is located
Check voltage +42 V on plug CU9.2.
- This is in the rear side of the mother board. The mother board or central unit is the big board where all the other electronic boards are plugged in.
Check basic condition of LED V14 on board KK for cutting buttons activated within 0.5 sec.
Check basic condition of LED V15 on board KK for Signal starting cutting
Check basic condition of LED V16 on board KK for safety bolt activated
Check basic condition of LED V17 on board KK for Signal starting clamping
Check basic condition of LED V18 on board KK for light barrier test completed
If one of these LED´s (14 to 18) is lit up exchange card KK.