Which resistance controls the card reader speed on a HP-97

[AndiGer]

@Bouw
You can test the reader without assembling and disassembling every time.
Look at that repair guide, picture 19 + description:
http://www.rskey.org/CMS/index.php/the-library/102
"To test the card reader, assemble the frame and case as shown. Don't forget to connect the keyboard and display connector. Then, pull the ribbon cable through the frame and attach the card reader. This makes it easy to test without assembly and disassembly. Adjust slotted shaft until the card reads and writes properly."
Andi
BTW: Recently I encountered the same problem too. So we are 3.