Hp-41C card reader - dead

[teenix]

(04-03-2020 10:26 AM)Vintage63 Wrote:  tested the motor this morning and it works. Used a single AAA battery. It shrieks a bit though, does it need lubricating somewhere ?

The shriek is most likely worn motor bearings allowing the motor shaft to vibrate a bit when it is rotating. They are not repairable as far as I know, but it was mentioned in the Forum that a tiny amount of lubricant (grease??) placed on the worm gear end will help. This is the shaft end where it mates with the thrust ball bearing inside the plastic housing.

cheers

Tony