Hi Kris,dont have a whole lot of experience with the ES but do know that over
time discreet electronic bits and pieces that make up a monolithic system
can have their values change with age,called "component drift".Most times
when a single component fails,it does so in the 'open' position,no current would flow,
rendering system inoperable.Sounds like your piece is heading in that direction.To be sure,you might want to check battery vault for fouling from oxides,other crud that might inhibit current flow.
Those Cds meters are fairly easy to calibrate if they're 'out of whack',pretty much a
wheatstone bridge that just requires the trimming of some varible resistors to bring them back to acceptable level.If you could find a service manual,should be able to
get a little more info than I can offer in this regard.
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