HP-67 Card Reader & Sense Amp problem

[mikemorris]

I'm still working on this sense amp board problem (Is "Sense Amp" the right term?). I think I've found a discrepancy in the schmatics for the HP-67.

- Someone developed a set of schematics which are hand drawn, I'm not sure who the author was. Those schematics show 22uF capacitors connecting pins 4&6 (HAC, CA), and also pins 8&10 (HBC, CB). The pick up coils are shown connected directly to pins 4&5, and 8&9.

- There is another set of schematics drawn with some CAD tool making them look very professional. This set of schematics shows pins 4&6 connected to each other directly and the capacitor is in series with the pickup coil. Pins 8&10 are wired similarly.

I have not traced our my Card Reader PCB completely and I think this is not material to my current draw problem. Can anyone help clear this discrepancy?