HP-65 more on the card reader

[albertofenini]

Hi everyone, thanks for all the ideas.
Last weekend we worked on our HP67 units, these were also in need of a restoration, and we
will post separately what we did, as it may be of help for someone.
We didn't work on the HP65, and we will try over the next few days.

As per Geoff suggestions :

Even in our HP67 the card reader PCBs are a little warped, without any problem.
As per the wiring, we used the same system with the other HP65 we restored, without any problem.
We do this so that we can capture at the same time the two channels RA and RB or WA and WB with the scope.
However, now that we know that the only bad channel il WB we may as well remove them.
Please consider that once the unit is in the case, WB is noisy even if measured at the Amplifier pin level, which would exclude
the wiring being responsible for the noise.

We'll try to clean ad reinforce the pins, which are however well aligned and cleaned.
We may as well try this particular card reader with and HP67 and see if it works.

We'll do more tests and we'll post the results !
Thanks everyone !!