Testing DC Voltage in a Washer

 All right, so what you're looking at right here is a DC, uh, DC driven... I guess we're gonna look at DC driven circuitry, okay? And we'll also talk about the color code as well. So two, uh, two boards that communicate with the main control board are gonna be obviously your inverter and your user interface, and we talked about that, but now we're gonna get into the details.

So let's talk first about the connectivity between the user interface and the main control board. And again, we're gonna go ahead and zoom in right to that section right there. Now, the main control board, right, the connector that comes, um, where the wire harness comes from on the main is connector J615.

Again, I'm just gonna reiterate, it is a nine-pin connector because it's a box with n- nine numbers. Uh, only four of those pins are utilized, okay? Pins number two, three, four, and eight. Now, on the other side, which is the user interface, you have a five-pin connector, and that is J101, where four of the pins are utilized, pin two, three, four, and five.

So the first, uh, I, I guess the most, uh, critical point here that we need to measure, and it should stand out, is that 13.5 volt DC line right there. So if you measure at the main control board, you're gonna be going to pin number eight. And if you were to measure at the user interface, you would go to pin number five on

that connector. That is a B22, so we talked about that earlier. What does B stand for? B is black. And the gauge is 22. It's a little bit higher number, which means it's a skinnier wire, okay? Very important that you understand that with gauge, a lot of you know this already, but I'm just gonna repeat it for those of you that don't, if the gauge number is higher, it's a thinner, skinnier wire.

If the number is lower, it's a thicker wire, okay? And that's how you would be able to tell whether it's AC or DC, in some cases, not every single one. So either way, just make sure you look at the schematic. All right. Now, it's complementing ground line is actually this red wire over here, which is on pin number four.

Uh, and it doesn't matter whether you go to the u- uh, to the UI board or the main control board. It's kind of weird how they switch the colors over here, uh, where, you know, typically red is gonna be the voltage and black is gonna be ground, but that's how we did it in this particular case. Uh, don't ask me why.

It's just the way that it is. Now, if you were to reverse your leads, the only thing you would see is a negative 13.5 volts voltage, but, um, it doesn't really matter. As long as you have 13.5 volts DC at, uh, at that point, whether it's the main or the user interface, then you know you have voltage. If you measure...

For example, if you have a dead user interface, and you measure pins number nine and four on the, on the main control board and you get nothing, guess what? You have a bad main control board. And what I would do just to go a step further, I would detach the connector from the us- from the... that goes to the user interface to the main