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Old 30th Jul 2020, 10:02 am   #13
Dickie
Octode
 
Join Date: Sep 2004
Location: St. Albans, Hertfordshire, UK.
Posts: 1,099
Default Re: Marconi TF2431 Counter Service Manual / Schematic

I wonder if the schmitt trigger is not working correctly? If you connect a 50R resistor across the input it should kill any pickup. then you can put an LF signal in and check the correct operation of it with a scope.
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Richard, BVWS member
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