Re: Repairing HP 65 Message #5 Posted by John Robinson on 15 Mar 2013, 7:16 p.m., in response to message #4 by Michae Altmann
You should need a scope to do some basic determination of the card reader problem. I'd suggest firstly open the calculator, and carefully removing the card reader motor by unsoldering the motor at the motor end, and testing it with 3 volts, just to make sure the motor is spinning.
If motor is good, I'd then remove the roller, and test the contact switches by sliding a card through the slot.
Cheers,
John
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