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7.13 Error message 04A0 troubleshooting
Figure A
[Symptom ]
a. UCB no communication received.
[Solution]
a. If the display is giving a 04A0 error, LED DSP2 (RS485) should be light (Figure A). If this light
is not on and a 04A0 error is present, replace the UCB.
b. Check the connection of the console communication cable at both of the console and the MCB.
c. Replace the console communication cable.
d. Replace the UCB.