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Quick Tips for Reading Unclear or Ambiguous Schematics
Sometimes, the schematics that manufacturers give us aren't as clear as we would like them to be. Take this refrigerator, for example...
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Do you know the most efficient way to troubleshoot this washer motor, or would you go through unnecessary disassembly? Watch this webinar excerpt to find out.
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Can Low Water Pressure Cause Solenoid Valves to Leak?
We run into water inlet solenoid valves in many different situations -- washers, dishwashers, refrigerators -- so it's important to have a firm grasp on exactly how they work. For example, I just talked with a tech recently who was wondering why low water pressure can cause inlet valves to leak.
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In this short, informative video, the Samurai walks through the steps of the patented Timer Chart Cha-Cha -- a system for reading and applying timer charts to schematics so that you can make sense of what's going on in the circuit. In just 2 minutes, you'll learn the steps of the Cha-Cha which empower you to troubleshoot timer-controlled circuits with ease.
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In this excerpt from one of our many illuminating webinar recordings, the Samurai traces out the circuit for a refrigerator evaporator fan. Interestingly, the neutral side of the fan's power supply goes through both the defrost terminator and the defrost heater. How can this be?

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GFCIs, AFCIs, and Nuisance Tripping
The most basic circuit safety device that everyone is familiar with is the circuit breaker. All a breaker has to do is detect if the amperage in its circuit exceeds a certain threshold and open the circuit if it does. Simple and effective, but not every electrical hazard involves excessive current. In fact, having less current than you should can also indicate a serious safety issue. Enter the GFCI and the AFCI.

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Push to start switches are extremely common technology in dryers, but do you actually know how they work? And do you know the fatal troubleshooting error that can lead you to misdiagnose them? Watch this short excerpt to find out.
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After 8 months of appliance hell, I stumbled upon the Master Samurai Training Tech Academy. Within one month of applying the teachings through the courses I excelled as a real deal appliance diagtician. I went from being the laughing stock of the parts house to them asking me for advice. 
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What Does "Split-Phase" Really Mean in Motors?
You're probably familiar with the term "split-phase motor", but do you actually know what it means? That's exactly what we'll dive into in this post.
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BLDC Motor Configurations, FG signals, and PWM signals
BLDC motors aren't new technology in appliances anymore -- in fact, they've become the norm. As such, it's important to be aware of the different configurations you'll see these motors in across appliances. These configurations fall into three categories: 2-wire, 3-wire, and 4-wire.

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Bubble, Dew, and Glide in Refrigerants
Superheat, subcooling, bubble, dew, and glide in refrigerants.
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Diodes in AC Circuits
Put simply, diodes are devices that only allow current to flow in one direction. In DC circuits, this means that a diode can either act as a conductor, just as a stretch of wire would, or as an open in the circuit, depending on the configuration. But what happens when you put one of these devices in an AC circuit?
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If you want to troubleshoot like a real tech, you use EEPs -- that's Electrically Equivalent Points. Identifying EEPs requires both being able to skillfully read a schematic and having a solid understanding of how electricity works. By doing this, you eliminate all unnecessary disassembly, increasing the profitability of your business by saving time and money.
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Is 120 VAC Really 120 Volts?
Let's take a look at the sine wave you would see if you hooked up an oscilloscope to a typical household power supply. This is showing reading line with respect to neutral.
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Know your Multimeter: a Short Breakdown of Every Meter Function
Let's take a look at a multimeter and talk about what each function does and what it's good for.
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Spot the Error in this Schematic...
Here's a timing chart and a schematic. See if you can spot the problem... (HINT: it's in the motor circuit.)
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Self-clean sounds like a great idea, right? Just push a button and watch your oven burn away all that caked-on grease and charred food.It certainly makes for a good selling point. But is this no-hassle cleaning feature really all it's cracked up to be? And what is the best way for the customer to use it (if at all)?
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How to Identify Unfamiliar Parts in Schematics
Take a look at the cooktop schematic below.


I don't know about you, but "tranformator" isn't a familiar term to me. it certainly sounds like a transformer, but why would a transformer be necessary in a 240 VAC cooktop element circuit?
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Internet-connected appliances aren't a niche anymore. They're made by just about every brand out there, from Samsung to Whirlpool and beyond, so if you want to stay in the appliance repair game, you've got to know how they work. Lucky for you, this post is going to break down what you need to know to work on them.
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Identifying Sensing Wires in Schematics
Have you ever noticed some connections on a schematic that just look plain unnecessary? Take a look at CN1 on this diagram.
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When it comes time to perform the repair and install a new part, the last thing you want is a surprise throwing a wrench in your plans. All the unexpected twists and turns should have already been dealt with during your troubleshooting. Ideally, performing the repair itself should just mean doing as little disassembly as possible, installing the new part, and collecting your repair fee.
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PSC (Permanent Split Capacitor) motors are nifty pieces of technology that you'll most often encounter in Whirlpool's VWM washers. They operate a bit differently from your typical split-phase motors. Rather than having a dedicated start winding and run winding, with each winding having different specifications, PSC motors have two windings that are physically identical. The only difference between them is in what direction the windings are wound.
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What are TMR sensors and how are they different from Hall Effect sensors?
New technologies are never invented specifically for household appliances. We always get hand-me-downs. But just because a technology was used first in a different field doesn't mean that we're familiar with it already when it reaches appliances.

TMR (tunnel magentoresistance) sensors are one such example. Coming to us from the world of computer electronics, they serve the same purpose as Hall Effect sensors but work completely differently.
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All of us techs are carrying around multimeters these days, and that means we have several different voltage measurement settings available to us at any given time. Usually these are DC voltage, AC voltage, and LoZ (low input impedance). Each of these functions has a specific use, and part of taking a voltage measurement is picking the correct setting for the job.
 
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Watch Out for this LG Control Board Booby Trap
Not all LG control boards can be updated after a universal compressor is installed. If you're planning on doing sealed system work on these machines, you're going to want to check the list below to see if your model's PCB can be updated. Otherwise, you might be in for a nasty surprise.
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