Diagnosing a Refrigerator Sealed System Problem using an Ammeter and an IR Temperature Gun

Posted on March 17, 2015 by - Tech Talk

Join Samurai Appliance Repair Man on a trek into the sealed system bowels of a warm refrigerator. Watch with amazement as I show you how to make a definitive diagnosis of a sealed system failure in this fridge using common, inexpensive tools that every appliance tech (who's worth their salt) and most DIYers already own: a clamp-on ammeter and an IR temperature gun.

Howl, o ye nations! Clap your hands, o ye peoples! No need for line piercing valves and pressure gauges IF you understand how sealed systems work, which we teach in stunning multi-media detail in the Refrigerators Troubleshooting and Repair Training Course here at the Samurai Tech Academy.

 

 

So let's look at where that current draw comes from and apply that to the compressor in the video.

Compressors are rated by horsepower. Horsepower is a measure of mechanical work. Watts are also a measure of work but the work in this case is electrical. The nameplate rating on compressors and motors gives the horsepower of the motor because you're usually interested in how much torque that motor can produce at a given voltage.

Horsepower is a measure of mechanical work just like watts is a measure of electrical work. You can convert horsepower to watts using the following conversion:

1 horsepower (hp) = 746 watts

The compressor in the video is an Embraco EGZ80HLP, a typical 1/3 hp compressor. 1/3 hp = 246 watts. Let's ignore mechanical inefficiencies in converting electrical work (watts) into mechanical work (horsepower) and run the numbers:

P= I * E => I = P / E = 246 watts / 120 vac = 2 amps

So that's where the "2 amps or maybe a little less" statement comes from in the video.

Let's compare this calculated current draw with a measured draw from the exact same compressor model (1/3 hp) in a different refrigerator, different service call, shown in the video below starting at 3:05 in, go ahead and fast forward:

 

 

I measured 1.6 amps in the video above but calculated 2 amps. Some of that difference is due to the run capacitor installed on the compressor. The purpose of the run cap is to smooth out the pulses in the motor and help it draw less current while running. But I'd say that qualifies as "2 amps or maybe a little less."

So what's to be done for this wayward fridge? Take it to da dump!

The cold, economic reality is that the EPA ozone depletion regulations have made doing sealed system work so prohibitively expensive (if it's to be done legally, correctly, and charged at a fair rate) that, in most cases, it simply does not make economic sense to do it anymore. Unless the fridge is either a built-in unit or is under some type of warranty, then sealed system failure is, for all practical purposes, a "total" event as far as the customer is concerned.

A Master Samurai Tech Presentation: Troubleshooting Appliance Electronic Control Boards

Posted on March 10, 2015 by - Presentations, Tech Talk

A Master Samurai Tech Presentation:
Troubleshooting Appliance Electronic Control Boards

 

Learn from the Samurai and become a troubleshooting master!

Using a Whirlpool dishwasher as a case study, the Samurai explains each step in the process of troubleshooting electronic control boards in appliances, revealing the schematic mysteries to all who want to learn.

In this 38-minute video, you will learn:

  • Basic troubleshooting techniques with broad applications to all appliances
  • How to use tech sheets properly
  • How to get those control boards to talk to you
  • How to identify suspected problems using the schematic diagram
  • How to formulate a troubleshooting strategy based on schematic analysis
  • How to identify where to make electrical measurements
  • About triac-gated neutrals in AC loads with standing voltage
  • The difference between loading and non-loading voltage meters and when and why to use each

...and much more!

You will have LIFETIME ACCESS to this video!

 

Here are a few tantalizing screenshots of the presentation...

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One small price of admission gains you lifetime access to this valuable training video as well as the ability to ask follow-up questions in the comments section. Watch it as many times as you like as part of your journey to become a Master Samurai Tech!

Note: if you are enrolled in Advanced Schematic Analysis and Troubleshooting, then you have access to this presentation in your course materials.

Pricing:
$25 Click here to begin your journey of Total Appliance Enlightenment!

Big Changes to the Academy’s Appliance Repair Training Courses

Posted on March 1, 2015 by - Academy Talk, Tech Talk

Here at the Samurai Tech Academy, we're always thinking about our students! (That's not quite as creepy as it sounds.)

In yet another example of the STA's devotion to the needs of our students, we have added new Module Exams to most of the modules in the technical courses. Many of you were asking for more challenges along the way to make sure you're really getting the material. Module Exams are a great way to revisit the info from all of the units you've studied and make sure you've nailed it before moving on to a new module.

IMPORTANT: if you are currently working through Fundamentals or Refrigerators, you will have to go back and take any exams for modules you've already completed before you can move forward. I hope you will see this as an opportunity to review and practice the material from those modules, and know that it will help you when you get to the Final Exam!

If you have already completed either course, you can still go back and take the exams for funsies!

But wait! There's more!

Another change we made was a three-attempt limit on the quizzes that come after each unit (lesson). We did this because if a student needs to re-do a quiz more than three times, there's something wrong either with the student's attention to the material presented in the unit or with the way the material is presented. Either way, we need to troubleshoot that!

So here's the drill: if a student requires more than three attempts to pass a quiz (and all unit quizzes require a score of 100% to pass and move on to the next unit) then the software sends me an email and the student's progress is temporarily stopped until we can talk either by phone, email, or the Student Forums.

After I've administered the appropriate gray matter massage, the student is re-enabled to re-take the quiz and continue on their merry way. Ultimately, the goal is to encourage more student-Samurai interaction as needed to help the student master the material.

7 Easy Steps for Signing up your Techs at the Master Samurai Tech Academy

Posted on February 24, 2015 by - Academy Talk, Business Talk

7 seven birthday anniversary celebrationWhen enrolling technicians in an MST Academy appliance repair training course, most business owners will do the registration/enrollment process themselves so that they will have the username and password for each tech, and can therefore log in as desired to check on a tech’s progress. Here’s how to do that:

1. Make sure you are NOT logged in (check the upper right hand corner of the site).

2. Go to the Enroll page.

3. Select the course or bundle you want from the pull-down menu box.

4. Now enter your coupon code, if you have one.

5. Create your tech’s profile - First and Last name, email address, username, password. (See notes below.)

6. Click "Add Billing Method" at the bottom of the Billing Method section of the enrollment form and enter your credit card information.

7. Click the red "Submit Form" button.

That’s it! The tech is ready to log in and start his Journey of Total Appliance Enlightenment! If you have more techs to enroll, simply go back to Step 1.

Notes -

1. Once you create a profile, the username cannot be changed. All of the other items can be changed, if needed.

2. Each email address must be unique, in other words, one per student.

3. If the tech’s email address has already been registered at the site (for example, to take the Sample Course), then you can’t do a new registration with that email. You can either use his existing registration (get his username and password, log in to the site with them, then enroll in a course) or contact us and we can delete his old account and you can start fresh.

4. If a tech has a company email address, then some business owners set their email client to forward messages from the Academy to them so they will see the progress notifications. (Emails are automatically sent out when a tech completes a lesson and successfully passes a quiz.)

5. Taking our courses is a very personalized experience for each student, so each technician needs his or her own enrollment in each course. For online training to be effective, students need to work at their own pace and be encouraged to repeat lessons and videos as needed. The goal is mastery of the material, after all! And each tech comes to their training with their own unique mix of strengths, weaknesses, and experience.

If you have any questions at all, please contact us!

5 Tips for Success in Your Online Appliance Repair Training Program

Posted on February 19, 2015 by - Academy Talk, Career Talk

Online Learning on Highway Signpost.Online training courses have become a huge benefit to adult learners. From individual how-to training for a specific task (like Microsoft’s online software tutorials) to massive open online courses (MOOCS) offered by universities to students worldwide, online education brings a vast array of opportunities within reach of learners in every field imaginable — all you need is access to a computer, some time, and the determination to succeed in your chosen topic.

Like every other endeavor in life, success in your online training program depends as much on what you put into it as in the coursework itself. Even the best-designed, most comprehensive online program is only as good as the effort and commitment each student applies to making the most of the experience.

If you are considering or possibly already made the commitment to pursue online schooling, here are a few tips to help guide you through the process. Even if you are considering a career outside of appliance repair training, these tips for online courses are applicable in any industry.

1. FIRST THINGS FIRST — A journey of a thousand miles starts with the first step, and the same is true of learning appliance repair. (Don’t worry, though: it won’t take a thousand miles.) Like anything else, appliance repair has a number of fundamentals that must be mastered before you go on to more challenging tasks. First, you must thoroughly understand the principles of electricity, electronics, gas, and so on. You need to be able to read schematics and extrapolate those diagrams into the inner workings of a refrigerator or stove or dishwasher before you ever open an instrument panel. And if you already have some experience working with appliances, don’t pooh-pooh the basic courses — chances are there’s a wealth of useful information your seat-of-the-pants experience never gave you. Besides, you don’t know what you don’t know, right?

2. DON’T BE AFRAID TO ASK — You’ve often heard it said that there’s no such thing as a stupid question. If you’ve tried and tried to master a concept on your own but just can’t seem to make it click, ask your instructor or advisor. That’s what they’re there for, and a few back-and-forth emails or perhaps a Skype conference can lead to that Aha! moment that will help you rise to the next level of achievement in your training. (And cordial relationships with your instructors can be advantageous when they are asked to recommend students for any job openings.)

3. DEVELOP DISCIPLINE AND PERSISTENCE — Whether you’re employed or you’re currently out of work, it’s crucial to set aside dedicated times to pursue your online studies. Perhaps you can get up earlier or stay up later to complete your coursework — or less ideally, study at various free times during a day — but it’s important to make your education a priority. Try to find quiet times and places, free of noise and interruptions, where you can really focus on absorbing the complex information you’ll need on the job. And no matter how hard it may seem at times to keep on track with your commitment, don’t give up. Keep your goal in mind and don’t let setbacks keep you from moving forward. You CAN do it!

4. KNOW YOUR LEARNING STYLE — Some of us are visual learners who need to see and interact with how things work, while others grasp concepts more readily through listening to lectures or reading. Your training provider may offer a variety of tools such as videos, manuals, syllabuses, or hands-on practicums geared to learners of every type. Choose your preferred method, but don’t overlook other modes — the more types of input you take advantage of, the more concrete your knowledge base will become.

5. DON’T RUSH — Did you read No. 1 above? Good. Yes, we all want to get out there, roll up our sleeves, and delve into the inner workings of every appliance we have learned about. Your instructor will let you know when you’re ready for hands-on work. When that eagerly awaited time arrives, it’s a good idea to try to find an apprentice or assistant position with an experienced repair technician who can help you develop in a real-world setting the manual skills you need to apply your theoretical knowledge. If you are already working in the field, your employer will be impressed with your new expertise and determination to get ahead and will assign more challenging responsibilities.

Master Samurai Tech allows students to gain a comprehensive foundation of knowledge that students may not receive through basic hands-on training. We teach each student how to think critically through any situation for a deeper understanding of the issue at hand. This prepares our students for anything this industry might throw at them, not just particular topics covered in training.

If a student approaches their online learning with this in mind, whether it is appliance repair training or computer programming, they will be successful in the “classroom” as well as any future career opportunities it leads to.

Good luck!