Appliance Repair

Main Control Board: Reading AC Circuits

Name: Main Control Board: Reading AC Circuits
Uploaded: 2026-09-09T01:09:16Z
Duration: 1 min 57 s
Description: Learn how to use a washer schematic to identify AC circuits on the main control board. Using the drain pump and water valves as examples, this lesson shows how connectors J512 and J514 relate to the schematic and where technicians can begin taking voltage and resistance measurements.

Learn how to use a washer schematic to identify AC circuits on the main control board. Using the drain pump and water valves as examples, this lesson shows how connectors J512 and J514 relate to the schematic and where technicians can begin taking voltage and resistance measurements.

Hard Skills

Appliances

Electrical

Juan Morales

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Transcript

And of course, we cannot forget about our pressure sensor, which is right there. And if we zoom in, let's take a look at what that looks like. There's our pressure sensor. It's an eight-pin con- uh, circuit, right, chip, with a little hole at the top. That's where the hose would go. So very, uh, very important that you're careful in that area, you don't yank that hose 'cause you could damage the pressure sensor.

So with that said, I don't wanna overwhelm you with 1,000 connectors over here. We're gonna focus on two major ones, okay? And the reason why I'm picking connector 512 and 514 is because these are the two connectors that are gonna operate your drain pump and your water valves. All right? So that's, uh, that's why we're picking these two right here.

We're gonna start off easy. We're just gonna show you, uh, how to identify where, for example, if you wanted to measure resistance or voltage for your drain pump or your water valves, where you would go. So the first, uh, part of the actual looking at the schematics over here is we're gonna identify AC circuits.

Okay? AC circuits. So let's go ahead and take a look at the, what the AC circuits look like. Now, what I've done here, just to give you an overview of this, this particular slide here, is I've taken a small piece of the schematic. So the schematic's bigger. It's got a lot of different sections to it. But we've taken the sections that are displaying the connectors for the drain pump and for the water valves.

Now, as you can see right now, there's two connectors. There's connector J512 and 514. In the middle, you see connector J513. That's for your door lock. But, uh, we're not gonna talk about that just, just yet. We'll, we'll get to it in a minute. Let's focus on the drain pump and the water valves first. Now, in your world, you're not gonna have a nice beautiful picture of the drain pump and the water valves like I, like I'm showing over here.

I'm only showing this so that you can identify what we're talking about. In your world, it's simply going to be a box that says drain pump and another box that has a bunch of numbers with a connector number