I would remove the Fluke and manually check the line to verify the short. Check the line both with power off and power on. (One of the gates with an output connected to the line may have something driving it's input such that it's output is pulling the line down. A hard short will be there even with power off.) Then use a HP Current Probe to see where the short is.
I haven't successfully used my current probe to isolate shorts. Any tips? Of course I got it off ebay with no manual, so I just made an educated guess on how to use it. JB --James Bright www.QuarterArcade.com Restored Arcade Games for your Home If you ever want to (un)subscribe yourself with TTL, you can send mail to: <Majordomo@flippers.com> with the following command in the body of your email message: (un)subscribe techtoolslist or from another email account, besides xxx@yyy.com: (un)subscribe techtoolslist xxx@yyy.com