[volt-nuts] Datron 1281 Repair Help ADC Key A to D Converter Calibration

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When I use the SPCL  Menu ADC Key I obtain the following error
A to D CORRN, Error 2008.
No other errors are listed.
What does this indicate?

After the ADC Cal I obtain the following readings with a constant voltage.
Resolution:
                 8 digit 10.000 106 7
                 7 digit 10.000 107
                 6 digit 10.000 28
                 5 digit 09.999 9
                 4 digit 10.000
Thanks,
John