[vcf-midatlantic] Schematic work needed

RETRO Innovations go4retro at go4retro.com
Wed Aug 29 11:05:10 EDT 2018

On 8/29/2018 9:49 AM, Kyle Owen via vcf-midatlantic wrote:
> Why would ohming out this board not yield a 100% correct schematic? I see
> no tricky components that would confuse an ohmmeter except the address
> switch, which could be unsoldered.

Many of the signals go under the ICs.  Sometimes, you can hold to a 
light and see through the PCB and validate where they go, but other 
times, I have missed wires connecting to more than 1 pin of the IC under 
the IC.  Ohming, if applied verbosely for each signal around the IC 
compared to each IC pin, should find all of them, but I don't think I 
would promise 100% perfection without spinning a PCB and testing the 
completed unit.

Maybe everyone else is better at ohming out boards and the hidden 
signals under ICs never bother anyone else, but I've gotten hit twice by 
them on two different efforts.


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