Texas TI-59: A tale in pictures

[albertofenini]

Hi Jose

Thanks for your reply
Will try to replicate and see what happens
But if it was disconnected how did you power it up ?
Take care Alberto

(03-26-2021 06:46 PM)jebem Wrote:  Hi Alberto,
I can't remember the exact procedure after all these years, but after reading my posts, I am quite confident that those readings were taken in open circuit, no load at all on each coil, when I was testing the motor and checking the coils impedance values, when the card reader assembly was disconnected from the main PCB. So I must have connected the gnd terminal of the scope probe to one coil wire, and the input scope probe to the other coil wire, checking each one of the four coils for a reading.