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No Output Voltage ln Domestic Automatic Voltage Regulator

By on October 28, 2021








This 5 Kilo Watt voltage stabilizer was brought to my shop with complaint of not working. To be sure of complaint, I did plug it into a/c wall socket, the “ln Use” led lit up, indicating the transformer is o.k, but no output voltage.

I opened up the case and to my surprise, the inside was very dirty and dusty, so I did a good cleaning, see picture:
how to fix a broken avr
Then  did virtual check on psb, observed all variable resistors rusted. Use my blue ESR meter to check all e-caps , some are out of ESR range, check other components: resistors, switches, transistors, diodes etc,all are good except variable resistors, few e-caps, switches.
So l did change all bad components, see pictures below:
how to repair avr
broken electronic components
Now is “moment of truth”,I plugged appliance into a/c socket and I heard
some clicking sound from relays, the stabilizer came alive again, see pictures below:
how to fix a broken avr
I connected it to my deep freezer for 5 days and it worked perfectly, called the client for his “finished repaired work”.
imoudou onwuwah

This article was prepared for you by Imoudu Onwumah from Nigeria. He is 62 years old and has just 3 years experience in electronics repairs. I started career in hotel industry as a chef, but then I was doing repairs only in electrical repairs as a  hobbyist. In 2018, I decided to learn about electronics which through Jestine’s electronics e-books and holding my hand, am an electronics techie today.

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Note: You can read his previous article on Insect Mosquitoes E-Killer Repair



  1. Yogesh Panchal

    October 28, 2021 at 6:01 pm

    Imoudu Onwumah,

    Good repair!

  2. Albert van Bemmelen

    October 28, 2021 at 8:59 pm

    Impressive repair you pulled of Imoudu, knowing you only started in electronics repair just 3 years ago! And fixing a 3KW device voltage regulator must also be one of the first this large that was published.

    • Albert van Bemmelen

      October 29, 2021 at 12:32 pm

      Oops it was even bigger with 5KW. Incredible! In my home and many other homes in my country that device probably will blow the main fuse as most power groups only handle max 16A which equals about 230V x 16A = 3680 Watt! And my main fuse is just 25A. Which also is too small to power a spot welder or other high power device like the Sunkko 709a 3.2KW spot welder that instead uses likely well over 4 KW power in my machine!

  3. Lynn Blakely

    October 28, 2021 at 10:31 pm

    Sir Imoudu Onwumah: There is always a good feeling when you repair, and have confidence that it will last a good while. Good Job and it pays to be thorough.

    • Imoudu Onwumah

      October 29, 2021 at 5:40 pm

      I appreciate your comments,thanks.
      The use of this 5kw is common in homes in my country since power from power grid is never stable,some use it to power their whole appartment.I use it to power my window a/c.

  4. moshe jacobson

    October 29, 2021 at 6:35 am

    Nice...very very nice job!

  5. Parasuraman S

    October 29, 2021 at 5:04 pm

    That was a real hunting job, resulting in ultimately accomplishing the job satisfactorily! Well done!

  6. Imoudu Onwumah

    October 29, 2021 at 5:44 pm


    Thanks for your comments.Have a nice day.

  7. Imoudu Onwumah

    October 29, 2021 at 5:50 pm


    Thanks for your comments,I try as mush as possible to satisfy my customers so they live smiling.Just as the saying "First impression goes a long way"

  8. Joshua Oloo

    October 30, 2021 at 6:21 am

    Thanks for a nice and educative repair article.proud of you and keep the spirit.

  9. Abraham Getahun

    November 6, 2021 at 7:26 am

    Is ESR meter most important in electronics repairing? I'm not financially well stabled to possess one. I only have a multimeter. I only use my God given tester, my eyes to look for bad e caps.

    • Mr. Famicom

      December 2, 2021 at 5:57 pm

      I'm a hobbyist and I'd say it's a must-have test equipment for a repairer like you. I don't have it my self though but I can see how handy it is to speed up our repair jobs. I'm on my way to have one and so should you.


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