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

[Geoff Quickfall]

Ah, important info, that means the 97 write circuit is correct.

Starting to sound like the read circuit is the problem in the 97. Have you written a card in the 67 and tried reading it in the 97.

Geoff

I have had quite a few read only or write only readers and have corrected all with shaft adjustment. I tweak the shaft turning only a few degrees at a time and testing. Less then a 1/32 of an turn per test.