Adjusting HP-97 card reader



#3

In his great write-up on replacing the rubber drive wheel, Mike Davis says "Adjust slotted shaft until the card reads and writes properly."

What's being adjusted here? Perhaps the slotted shaft, which is the axle for the gear roller and gear, is slightly excentric so turning it moves the gear closer to or farther away from the worm on the motor shaft?


#4

Yes, the shaft is eccentric, but what is being moved is the rubber wheel against the card to increase are decrease the pressure. Too much pressure and the motor will strain and the card will pull through too slowly. Too little pressure and the card may slip and not pull through smoothly. The service manual uses the current draw in the motor as the card is held back in the reader to determine the proper adjustment.


Possibly Related Threads...
Thread Author Replies Views Last Post
  Reasonable price for a 41C, Quad Mem, Time, Navigation and Card reader module? Eelco Rouw 10 2,064 12-12-2013, 01:52 AM
Last Post: Eelco Rouw
  hp-67 card reader problem. Marcel Samek 5 1,290 12-09-2013, 09:09 PM
Last Post: Paul Berger (Canada)
  HP-97 card reader pinch roller axle davorin 2 721 09-15-2013, 08:47 AM
Last Post: aj04062
  HP-97 Card Reader davorin 3 784 09-13-2013, 04:21 PM
Last Post: Stephan Matthys
  HP-67 Card Reader Repair Question aj04062 1 620 08-08-2013, 11:15 AM
Last Post: Randy
  Hp-67 card reader: tantalum capacitor identification Ignacio Sánchez 8 1,496 06-02-2013, 07:26 PM
Last Post: aj04062
  Testing card reader motor for 65 Michae Altmann 2 719 03-17-2013, 09:24 PM
Last Post: Randy
  Repaired HP-97 card reader doesn't show any signs of life jbssm 6 1,108 02-17-2013, 03:15 AM
Last Post: Alberto Fenini
  HP 65 card reader problem H Fischer 3 732 11-24-2012, 12:11 PM
Last Post: H Fischer
  41CL and Card reader Prabhu Bhooplapur 3 738 10-18-2012, 07:40 AM
Last Post: Ángel Martin

Forum Jump: