HP41 card reader repair

[David Hayden]

(11-21-2023 09:10 PM)Karel Wrote:  Thank you David.
I am aware of the wheel issue. Already got some material for repair just in case.

It is now in the state that when I plug in the reader, it is recognized by the calc. I can do catalog 2 on it.
When i insert a card, it starts behave wrongly. But I do not hear or feel the motor trying to spin.

I'm certainly no expert, but your symptoms seem consistent with a gummy wheel that's preventing the motor from spinning. EVERY card reader drive wheel turns into gunk, so if it hasn't been repaired, it needs to be. Note that you should repair the dampening couple that holds the worm gear to the drive motor axle at the same time. It's made of the same gunk.