HP67 Voltages on Card Reader IC 1826-0322 (card reader sense amplifier)

[teenix]

Also make sure there is a tiny bit of backlash between the worm and drive gears. The worm shaft should move back and forth a tiny bit. If the shaft is sitting tight, it will stress the motor bearings.

Some molybdenum grease on the little ball bearing at the end of the worm gear helps it along too.

cheers

Tony