HP-67 weird behavior after reading a card

[albertofenini]

Thanks to you and everyone’s help we did a good work
Now will try to fix the last one
BTW trying to fix it the display showed the same -000000000000
the we had last night replacing the first couple or ram chips so
a good candidate could be the ram chips
We still have a good couple of the 0231 e 0232 so tomorrow will try
Thanks again !!!!!