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How can you troubleshoot the display showing 888 intermittently on the Altivar ATV16?

Issue: How can you troubleshoot the display showing 888 intermittently on the Altivar ATV16?
 
Product Line: ATV16
 
Environment: All
 
Cause: Display 888
 
Resolution: First mount keypad directly onto drive then, swap keypads with known good one, replace drive controller as suspect failed power supply internally if swapping keypads doesn`t resolve issue.


 
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