HP 67 drawing a lot of current when reading a card

[cncjerry]

Thanks, the reader was rebuilt by me years ago. I've repaired 6 or more calculators, both HP and TI, that read cards. I have a 65, 67, two 41s with readers, and three or 4 excellent TI 59s. My TI 59s look and work like new. Hard to believe how much they cost back then. My 67 is, or was, my favorite, but now it seems like it has a problem in the sense amp. I note it has a resistor above the sense amp on the board. It is labeled as 40ohm, but measures 53.37 in circuit. Dont know what it does in this circuit, but I will probably replace it with the proper value. The motor sounds like it is hitting a high spot on the wheel so I replaced the silicon tube that I've used in my repairs successfully. I've tried using o-rings but they dont seem to be as consistently round as the tubing I have.

Thanks for the reply.

Jerry