HP-65 more on the card reader

[teenix]

(02-02-2019 02:50 AM)wallyt Wrote:  Now I hope I don't jinx what I accomplished by saying this but I think I finally got my HP65 card reader to work. After adjusting the eccentric cam for minimum current drain I replaced the original 5.11k ohm motor speed resistor with a pot and found the sweet spot to be 5.0k ohms. I assume a change was needed here because of the very slight difference in the diameter of the newly replaced pinch wheel from the original gummy wheel. I can read-in and execute per-programmed cards as well as record to blank cards and read/execute those too. I need to find a 5.0k 1% precision resistor to replace the temporary pot. I'm keeping my fingers crossed that this operational functionality lasts.

Could be what is wrong with Alberto's too.
I don't know if they make 5K, but 2 x 10K 1% 1/2W metal film resistors in parallel would do.

cheers

Tony