HP 65 Card reader task

[jftman]

Swapped.
Both boards work in the known working card reader.
Neither board works in the troubled card reader.
So, the CPU boards can be eliminated.

I suppose I could now jump to swapping the two boards that have the leaf springs?
Although as previously tested the MTR leaf at trace 9 seems to close OK. From reading this puts ground into the MTR circuit, and removes the High VOLTAGE, right?

If the multimeter test isn’t as much concerned with timing put only open and continuity, I should try something else besides swapping the leaf switch boards at this time. Correct?