Quoted from Nacman:I’m still chasing the chattering issue an since the solenoid in question sits on the auxiliary driver 8 board I’m focusing my efforts there.
The original Williams board blew a transistor so I replaced it with a rotten dog board. I don’t know if that figures into the equation of the chattering issue I have. So the only way that I have to test that theory is put the original board back in. I decided to test every component on the original board to see if burning up the tip102 had any other casualties.
There are 8- 2.7 Kohm resistors behind the diode behind the TIP102.
I only have two that register 2.7 K and the rest are around 2000 with one being 1800. I’ve also checked the pre-driver transistor and all of them check fine per instructions I found on here. All the other components which are mostly diode’s and transistors check within one percent of tolerance.
So my question is should I change out the ones that are way off and what is their real purpose?
Resistors are rated for accuracy, commonly from 1% to 10%. Most commercial products use 10%. Your values are way off for ANY tolerance marking! The fourth band is a color, usually gold for 5% or silver for 10%. Eliminate a variable and swap the out of spec resistors. Get some 5% replacements. Metal if you can find, since carbon tend to drift over time.