hp 82104A only reads 67/97 cards

[John Garza (3665)]

PROBLEM SOLVED

Apparently the replacement I used for the old gummy drive roller was 'out of round'. I replaced it and it worked!

Also apparently, the 67/97 data is likely of lower density on the card than 41C data and therefore more forgiving to variation in card speed. At least that's my best guess.

I use model aircraft fuel-line tubing for these repairs. I've found it superior to o-rings - more grip surface, no glue, looks like the original, etc. I've repaired about a dozen 65/67/97 card readers over the years, but this was my first 2 repairs of the HP82104A. I'm wondering now if this problem was a fluke or if the fuel line tubing has enough normal variation to make it problematic in 82104A repairs - yet 'good enough' for 65/67/97 repairs.

-John