Attendees: Bill Newman, Bob Erickson, Douglas Martin, George Ahearn, Joe Preston, Ron Williams, Stan Paddock, Robert Gardner and Allen Palmer
Visitors: none today
Allen Palmer re-joined us after a long term absence.
Joe Preston continued his work on the third tape drive of the German Machine. He misses Glenn Lea's help.
The rest of us continued to work on the card reading problem with the Connecticut machine. After checking the 20 volt, the 30 volt and the differential power supplies to no avail, we looked at the voltages at the read brushes.
The roller is suppose to ground the brushes when a brush falls through a hole in a punched card.
If more that 60 columns have the same punch in the same row, it is not able to do this. We have seen this on a scope with the advancing width cards.
Bill Newman is looking for replacement transistors for the ones in the 1402 that may be failing.
We ran the same test on the German machine and did not seethe failure pattern.
While I cannot say this is the problem, we will know in two weeks when we get back and try the fix.
Stan
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