HP-82104A Card Reader Repair Questions

[Papymouzot]

Hi,

I have tried in the past few days to bring three HP82104A card readers to life again with no luck so far for two of them. I have a similar issue, this is why I have not created a new post.

Thanks to a person I met through eBay I got some silicon tube to solve the gummy wheel issue.

One reader works fine now. I can read and write cards. When I changed the "gummy wheel" I didn't pay attention to the excentric pin.

For the other two readers the cards go through them but one reader gives me a CARD ERR message when I try to read a card, and the second gives me a MALFUNCTION message. I don't really wish to swap parts of the working reader with the other ones as I am afraid to make a mistake on the working reader.

I have not tried yet to adjust the eccentric pin to have a motor consumption of 200mA. I actually didn't find out what voltage I had to apply to the motor to measure the current if I wished to test it out of the reader main body.

I have read in an old archive that it could be a tantalum cap issue, but both readers have a vertical board assy of 82104-60007 and the post mentioned a board with vertical PCB being 82104-60025.

Can somebody help me ?
Thanks in advance