I bought a used Lutron FC-2500A frequency counter from eBay. Its channel B input was faulty and I repaired it. Now I'd like to align it to get a better precision and I need the service manual or at least its schematics.
It was also sold as BK Precision 1875. I contacted both Lutron and BK Precision and they both refused to provide the service manual.
Does anybody have the service manual I need?