Adjusting R8 to Increase HP-97 Printer Intensity

[teenix]

(02-17-2021 06:46 AM)James Linder Wrote:  I ordered the PCB mount potentiometers. I see they have 3 connectors.
Is the third connector just for a ground wire? I assume if yes, is this 3rd
connector the middle prong? Do I Just connect the middle prong to the black
wire going to the battery? Are the other 2 connectors bidirectional (does not matter
Which one is connected to R8 and which end is connected to the PCB connector?

Same setup as in the previous diagram. Usually the end connectors are the extremes of the pot resistance, and the center one is the wiper which slides across the resistance and gives the change as you rotate the shaft.

Definitely, no ground or battery wires connected, just to the disconnected R8 end and the PCB pad as mentioned previously.

If in doubt, and you have a multimeter, you can set it to ohms mode and measure the resistance between any end pin and the center one. You should see a change when you rotate the shaft.

cheers

Tony