[Amps] 87A Display Issue

N7SC n7sc at charter.net
Thu Aug 8 20:40:14 EDT 2019

Hello All...

   I'm working on an issue with the Tune-IP-HV LED display.  It works 
correctly on the tune and IP function,  however it always shows full 
scale on the HV function.

The analog voltages from the HV board up to the analog multiplexer (U13) 
on the microprocessor board look ok.  However, the multi sig voltage 
going from the A/D IC (U11)  on the processor board to the LM3914 
display always shows +5v only on the HV function.

Could this possibly be a programming issue ?? Has anyone ever seen this 
? I'm at a total loss. Hi Hi....Any help would would be appreciated !!



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