Re: Racal Dana 9916 Frequency Counter.
As you say above, it's unlikely that all the 7-segment displays have failed at once. More likely it is something common to all of them. It could as simple as a power supply issue, or possibly either the 7-seg driver (that drives each digit in parallel), or the multiplexing strobe signals, that select each digit in turn. Or, worst case, it could be the large LSI chip.
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Regards,
Richard, BVWS member
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