HP-65 goes on hold after reading a card

[teenix]

(12-01-2020 11:01 PM)albertofenini Wrote:  Hi Tony, Hi Everyone
we swapped the ROMs, all of them but nada ...
We put the spare ROMs in the unit with the C segments always on but it still behaves like that
At this point we took the ROMS taken out from that unit and we put them in the unit the goes on hold, but it still does it ...
I would say both types of problem do not depend from ROMs ...
Would can we try if anything ?
take care !!!

As the problem moved when you switched CPUs to a known working 65, I would say the logical culprit is the hybrid. The only other circuitry is the power supply.

cheers

Tony