Susan Brown

[Susan Brown]

That’s correct!

There’s a longer explanation of why that is in this Forum thread, if you’d like to check it out:

https://my.mastersamuraitech.com/appliance-repair-course-support/student-forums/topic/equivalent-resistance-in-parallel-circuits/

[Susan Brown]

Hi Nate,

Question #7: The two main temperature sensing applications are:

We’re not asking for the names or types of the temperature sensing devices, but for their application – what they are used for in the appliance. We discuss this very early on in the video in that unit – a couple of slides in.

Question #11: A common place to find bimetal temperature sensors is ____.

I selected “inside oven cells for temperature measurement” because at 10 minutes into the 90 minute video, he said, “there is bi-metal inside the gas valve in top service ignition” so I was thinking it was related to the oven.

“Inside oven cells for temperature measurement” is not the same thing as inside the gas valve for ignition.

Can bi-metals measure temperature?

Around 9:40 he does say in old school fridges we can find bimetal, for overload protection, related to defrost.

Now you are getting somewhere!

[Susan Brown]

Hi Nate,
Sure – I’ve reset you.
A lot of students miss this question. We have ones like this here and there that require paying attention to wording or other details, like units. It’s good practice, since that’s something a technician needs to do!

By the way, if you should need a reset in the future, you can use the Quiz & Exam Reset Request form (it’s in the submenu under “Contact Us”. Here’s the direct link: https://my.mastersamuraitech.com/quiz-exam-reset-request/ ) rather than post here. it’s a bit more direct that way.

[Susan Brown]

And earlier in the class, I thought I learned that if you have current in a closed circuit, that the circuit will read “zero volts” if you check the voltage within the circuit. But if it’s open at some point in the circuit, then you’d read, say, 120 volts at the point where it’s open, because there’s the potential for current there.

Any properly-functioning circuit will have a load in it, and there will be voltage drop across the load that is equal to the source voltage. (If there are multiple loads in series, the voltage drop will divide up among them. See Mod. 3, unit 8, if you don’t remember this.)

If you measure along a wire with no load in between the probes, then you would measure 0 volts. But you will measure voltage if you put your probes on either side of a load (when current is flowing).

When you see us tracing Line (with red) and N (with blue), those lines will always be connected to a load. Otherwise, how does it switch from L1 to N?

[Susan Brown]

Hi Nate,

Putting your training to use in real life is part of the learning process. It definitely takes practice to get really good at making electrical measurements. But, you are building a strong foundation to grow from. You’ll also get more practice in our Oven & Range course and Advanced troubleshooting.

I’ll ask Sam if he can help you further with #5.

[Susan Brown]

Can you tell me which video and the time stamp where we discuss this?

[Susan Brown]

Hi Nate,

It looks like you already retook this quiz and got everything correct except #5.

Question #5: At what locations in this diagram would you make the test that you indicated above?

Answer: The explanation says “You’re checking to see if the noise filter is capable of putting out 120 V AC. Looking at the schematic, the output is at the points labelled L2 to N2.”

So I would test from L1 to L2?

The correct answer is given in the explanation – L2 to N2. If that doesn’t make sense, let me know and I’ll get more help for you!

[Susan Brown]

Hi Nate,

The timing chart tells you which timer switches are closed for the cycle and load of interest. You will then use that information on the schematic (which switches are open or closed) to trace out Line and N for the load of interest (in this case, the pump). The closed switches determine the paths.

Here’s an image that might help you to understand which contacts are where.

T17 is only present up to the switch node I circled and labeled T17. Same thing for T18. T16 comes up to the node labeled T16. If you look at the whole schematic again, you’ll then see that it goes down to Cam 8. With that in mind, hopefully you’ll understand why Scott drew the neutral line the way he did, based on the timing chart saying Cam 10 would connect 16 to 17, and Cam 8 would connect 13 to 16. Does that help?

[Susan Brown]

You’re welcome!

[Susan Brown]

Yes, you are allowed to do that, although it is good to push yourself to try to first answer a question from memory. But if you are stumped, looking at the course material during a quiz is fine. We’d rather you do that than simply guess at the answer!

If you do that, be sure you don’t navigate away from a quiz once you’ve started it. If you need to look in a different unit than the one the quiz is on, open it in a new tab or window.

Thanks for asking!

[Susan Brown]

Hi Art,

I’m not sure what you mean about getting the answer correct but not getting credit for it. I’ll send you an email – that’ll be an easier way to get this straightened out.

By the way, we encourage students to get 100% on as many quizzes as possible. We are quizzing you on important things to know for your job, and we give you two attempts to figure out the correct answers. The more you figure out now, the more profitable you’ll be in your work!

[Susan Brown]

Hi there! I’m always glad to see students thinking these things through.

Yes, we suspect that we’ll measure OL, but anytime we do an electrical measurement we want to know what the spec is and compare the measurements to that. The spec is what we expect. It’s a fine point, particularly in this scenario, but we like to have a consistent approach when it comes to interpreting measurements.

[Susan Brown]

Great job, Nate – you’ve got it right for both of those. The only other thing I like to see mentioned for Question 9 (just to really nail down the details) is what do those measurements also mean in terms of current flow for the circuit?

[Susan Brown]

I’m really baffled by why you want to argue about this so much. You also don’t seem to be reading my replies carefully.

No- the first systems you checked were
1. the air distribution system (“not hearing the evap fan motor”)
2. the refrigeration system (“put ear against fridge to listen for any humming”)

In the quote above, I was summarizing what you did in your example scenario. Pointing out that you did not in fact check the controls first, as you were saying that a tech should do before the refrigeration system. This was meant to show that what you and I are saying is not all that far apart.

I then went on to point out that:

BTW – it is fine to note whether or not the evap fan is running while you are shooting the compartment temperatures to verify the complaint, but it is a very weak piece of information – you can’t really do anything diagnostically with that at this point if both compartments are indeed warm.

I don’t know how you read any of this as an endorsement of starting your troubleshooting of a warm freezer/fridge at the air distribution system. I have consistently been saying that the compressor is the first thing you want to know about.

[Susan Brown]

I think you are reading things in our statements that are not there, which is why you think there’s a big disagreement here.

You already told us that you yourself first listen for the compressor (which is part of the refrigeration system) before tapping the cold control (which only works on a small group of refrigerators, by the way). If you heard the compressor running, you wouldn’t bother to tap the cold control, right?

A tech’s first check on a warm box should be to see if the compressor is running – period.

And that is what we mean by checking the refrigeration system first.

before bothering to test if all the refrigeration system components are operating.

We have not said that you’ll check each and every component in the system before turning your attention to the other systems, no matter what you find.

For example, on a warm freezer/ff compartment complaint, if the compressor is not running, then we would not proceed to check the rest of the sealed system. Instead we would then turn to the control system.

Thinking in terms of systems helps techs approach all of the refrigerator models out there, even newer ones, in a logical and efficient way. You want your troubleshooting to be systematic, not idiosyncratic, and grounded in a fundamental knowledge of how the systems work with each other in the appliance. Knowing model-specific tricks like tapping on a cold control is icing on the cake – but it is not the cake itself. And I think if you carefully compare what we are saying to what you actually do on a service call, you’ll see a lot of agreement.

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