Susan Brown

[Susan Brown]

Do you mean where I put the “x” below?

If so, the “Zen trick” will determine this for you… what do you think? Label the parallel circuits 1, 2, and 3. (Circuit 1 would be the one closest to L1, circuit 3 closest to N)

Good question, by the way.

[Susan Brown]

Hi Ed,
I’m having a hard time figuring out what you’re asking. Are you talking about these diagrams?

[Susan Brown]

Hi Duane,

It’s because that is what the 4031 error code identifies as the suspect load when we did the diagnostic mode (see the previous unit- look especially at the explanation for Question 3 in that quiz).

[Susan Brown]

Hi Tim,

Here’s a video that shows the calculation (using different values for the resistances). See if this helps.

Also, some people get a slightly different answer from us, depending on how you treat the decimal numbers (if your round them off differently than we do).

https://www.youtube.com/embed/iHB3lxdc68E

 

Let me know if this helps.

[Susan Brown]

Hi Robert,
That question is best to handle by email – I’ll send you a note now…

[Susan Brown]

Hi Robert,

A noble goal!

You’ve already got a great start, by taking the Core course. That gives you a solid introduction. I would encourage you to watch the videos in Basic Electricity and the Troubleshooting Module more than one time. Also, ask us questions here if there’s anything you don’t quite follow.

We have other courses that will give you more training and practice: Advanced Troubleshooting and the Oven & Range Repair.

We also have dozens of hours of webinar recordings that you can watch at Appliantology. Many of them involve going over schematics, or doing case studies using schematics, etc.

There are no short-cuts to becoming proficient at reading and using schematics. It takes time and practice. Just be sure to use all of the resources you have available both at Master Samurai Tech and Appliantology!

[Susan Brown]

Hi Davy,

In a split phase motor, the start direction of the motor depends on the polarization of the start winding relative to the main winding. (Polarization of the winding is which end gets Line and which end gets Neutral.)

In order to reverse the direction, the motor has to come to a complete stop, then restart with the polarization of the start winding reversed from the original direction. This is what cams 2 and 4 are doing.

Make sense? We do cover this in more detail in the Washer & Dryer course.

[Susan Brown]

“Big” heat sink with aluminum fins 🙂

[Susan Brown]

Hi Darren,

Good question, and you’ve basically got it correct.

The Ribbon connector (from the low voltage board) provides the power to energize the coils in the relays, which creates a magnetic field that closes the switch(es). When a switch closes, that provides L1 up to a load. (Neutral is connected to the other side of the loads.)

Just a couple of other things to make sure you’re thinking of it clearly:

When you think of L1 “flowing” through the switch, make sure you are thinking current (electrons moving). (Voltage does not “flow”.) Also, since this is AC power, the electrons will move back and forth through the switch, not just in one direction.

Make sense?

[Susan Brown]

Hi Chase,

For Question 2, look for a little table on the tech sheet that’s titled “Temperature Switch Circuit” (it’s kind of in the middle of the sheet).

For #10, here’s a close-up of the schematic to make sure we’re looking at the same load. What do you see coming in to either side of the motor?

[Susan Brown]

you’re welcome!

[Susan Brown]

You want to look at the diagram labelled “Schematic Diagram” at the top, not the “Wiring Diagram”

On that schematic diagram, the lights are called “Hot Ind Lights” and the LOI is the one labelled LF-Y.

As you correctly answered on a previous question, there’s a yellow wire on the L1 side of the light, and red on the L2.

For Question 2, we ask how the light gets L1, and there are two correct answers out of the choices we give you. After you took the quiz for the first time, we also gave you the following tip – did you see this?

When the surface element is first switched on, the light gets L1 through the L1 to H1 contacts of the infinite switch and the black jumper wire. This can be easy to miss because the two ends of the black jumper aren’t explicitly shown as being connected.

During the element’s operation, once it gets hot enough, the light’s bimetal switch closes, providing another path for L1. This means that even after the infinite switch is opened, turning the element off, the light stays lit until the element cools off enough for the light’s bimetal to open again.

As for Question 3, how it gets L2 – that’s pretty straightforward if you look at the schematic and not the wiring diagram.

[Susan Brown]

VDCs are old technology, found in radio transmitters and the old cathode ray tube TVs, for example. The only common application at this point where you’ll encounter it as an appliance tech is in microwaves.

There is still a transformer in this circuit, which steps up from line voltage to about 2000vac. Since power in has to equal power out (minus heat losses) in a transformer, the transformer is what determines the current (since P = I x E)

If you have any other questions, let me know.

[Susan Brown]

Hi Ed,

Most people struggle with this question when they are looking at the wrong light on the schematic. You are looking for the Left-Front hot indicator light on the schematic. It is one of 4 lights (one for each burner).

How is the light you are looking at labelled?

[Susan Brown]

I think if you go on and read the next bullet point, it’s clearer. The capacitor and rectifier work together to approximately double the voltage. We don’t go into detail about how that happens, we just want you to have a functional understanding of how these components do what they do. FYI – It is called a Voltage Doubler Circuit in the industry. This happens because the rectifier prevents the capacitor from discharging every half cycle, which is how the charge is roughly doubled in the capacitor.

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