HP-67 1805S02334 [RA and RB noisy, doesn't read but writes]

[albertofenini]

Hi Tony, Hi everyone,

I did change the two 22microF capacitors on the card reader PCB
I have also cleaned the contacts as this is a plug versions
but the behavior it's exactly the same

I have also uploaded more pictures and besides the missing battery connectors
both the keyboard PCB and the card reader PCB had been reworked because of
the corrosion

I have soldered very thin wires to replace the corroded traces, so may be while I
had been quite careful in doing this, this wires and soldering could be the origin
of the noise

Would have been better to use a silver conductive pen rather than soldering wires ?

The next steps could be opening a known working (plug version) calculator and try this whole
card reader assembly in that unit, and eventually do the same with the keyboard assembly

take care !!

Updated album : HP-67 1705A01234