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Old 25th Nov 2020, 10:46 pm   #22
g0hze snowy
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Join Date: Oct 2013
Location: Peterborough, Cambridgeshire, UK.
Posts: 140
Default Re: Racal Dana 9916 Frequency Counter.

Good evening Peter, thanks for your reply, i have ordered some replacement 74247 led driver ic's, i have 7447, these are the older types, probably no built in protection or something, i will have to check the pinouts.
I have had the display board off looking for any sort of problem and fitted a socket for the new 74247 when they arrive.
Did you see the comment re damaged trace under a red dot of some marker pen fluid or something, this feeds IC1 but as i am unable to add a pic ( dont know how to) to show everybody the affected area i am not sure if it is a data line, all i can say for certain is that it goes to the edge connector feeding the display board.
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