HP-65 more on the card reader

[albertofenini]

Thank you very much for the tips
The unit is powered from a battery, so I take it is clean
We didn't change the capacitor on the motor, we'll do that
We'll scope all of the voltages on the unit and see what we find
What do you mean with filter cap(acitor ?) on Vbsw
The PSU provides Vcc, Vss and Vgg
What is Vbsw (which I have seen in some schematics) and how much should be ?
Is that the Battery Voltage ?
I have read that :
Vbsw : Now, with the logic board removed, apply the power to the
battery contacts. You should be able to measure the battery voltage
between Vbsw and Gnd on the 28 pin connector. Disconnect the power from
the battery contacts.
Should we do as described to measure Vbsw ?
Thanks again Alberto