I am having a Yaskawa Make Servo Drive Model DR2-01BDY139.
The problem is at power on, the 'a' and 'd' segment of the seven segment display on the drive comes on and remains on in that condition.
I feel it may be the CPU error.

I have checked the internal supply voltages on the control card and they seem to be ok.

Can anyone suggest what should I check next.

I am aware that this is a very old model, but this is the first time it has given a problem.

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