Von HotPoint Microwave Oven Came In With “No Heating” Problem Now Repaired
I received this microwave in my shop from a client who wanted to see if it will ever work again, according to her she had given up on it and it has stayed in her house for over one year but before throwing it away to the dustbin decided to try a technician for the final word. Upon opening it I also almost give up on it as you can see the picture below:
Too much dirty from cockroaches and lots of area with signs of stress and I almost returned it as not repairable.
I was also not particularly happy with this connector to the magnetron as you can below:
So where do I start? First I wanted to see if the low voltage circuit was working well and the best place to do this test is to disconnect the high voltage transformer primary input (two wires) and connect the meter in AC mode, operate the microwave normally and observe the meter reading.
This is what I got, 227.4 AC. This means the primary circuits are working well and therefore I can proceed with the high voltage circuits.
High voltages circuit in microwave oven includes magnetron, high voltage transformer, high voltage diode, high voltage capacitor and high voltage fuse. I have done detailed analysis and how to test these components in my book microwave repair made easy sold here.
First I checked the high voltage fuse and it was open circuit, next I checked the high voltage diode and also found it dead short. Using multi-components tester to test high voltage capacitor and I also found it dead.
After replacing these components I decided to test the machine using the old magnetron, the best test for magnetron is direct replacement but I decided to use the same.
I re-assembled everything including the back cover since it is not recommended to power the microwave oven without the back cover for safety purposes.
I used a glass of water and I applied power to the microwave and set the time to one minute, after the lapse of one minute I decided to see if there is any hope, to my surprise the water was extremely hot.
I contacted the customer about the machine and she was so happy by success report.
Thank you
Stay safe
Humphrey Kimathi is from Nairobi Kenya and the author of:
1) Lcd-Led television repair guide
2) Microwave Oven Repair Made Easy
3) CRT Television repair course
4) Basic Electronics Course For Beginners
5) Basic Electronics course.
He is also a blogger at Electronicsrepairmadeasy.com
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. If you have electronic repair articles to share with us, please contact us HERE.
P.S- If you enjoyed reading the above article, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
Note: You may check out his previous post on 32 inch LG Television Model 32LH20R Dead, Now Repaired
(63)Dislikes
(0)
16 Comments
Leave a Reply
Parasuraman S
February 12, 2022 at 9:53 pm
Excellent step by step guide! I presume you have cleaned up the inside very well before completing your job!
Humphrey Kimathi
February 13, 2022 at 12:25 am
Oops! I forgot...next time i promise to careful Parasuraman.but for the couch roaches dropping i did quite some work clearing it, issue was the stains everywhere.
Regards Humphrey
Tayo
February 12, 2022 at 10:07 pm
Well done. I will use this opportunity to lookup how microwave ovens actually work. This article has made me want to understand how the magic happens!
Humphrey Kimathi
February 13, 2022 at 12:34 am
Microwave repair is quite easy Tayo,but also most dangerous when repairing, so you must not attempt to repair microwave without first familiarizing with safety measures around them.
Regards Humphrey
Albert van Bemmelen
February 12, 2022 at 10:25 pm
Good job done with safety measures applied as a precaution to the magnetron tube's 2400MHz high power emission and absorption radiation!
Humphrey Kimathi
February 13, 2022 at 12:38 am
Exactly Albert.
Regards Humphrey
Babu M S
February 13, 2022 at 12:17 am
Fantastic job,shown the steps to attend the fault with safety measure.Thank you very much for sharing.
Humphrey Mndaka
February 16, 2022 at 8:22 pm
Thank you Babu for your feedback, I appreciate it.
Regards Humphreyh
Tito Kanshulu
February 13, 2022 at 12:31 pm
Good job Humphrey, and a well step by step explanation. I love it. Thanks
Humphrey Mndaka
February 16, 2022 at 8:24 pm
Thanks my friend Tito, you are much welcome.
Regards Humphrey
Imoudu Onwumah
February 14, 2022 at 12:33 am
I gain something from this article,Thanks for sharing.
Humphrey Mndaka
February 16, 2022 at 8:26 pm
How are you my brotha from Nigeria Ooo...good to see you here.
Regards Humphrey
Edwin
February 17, 2022 at 2:00 am
There are ways to test the magnetron..always first confirm its ok otherwise there is risk of damaging the new components in case magnetron is leaking or shorted
Yogesh Panchal
February 14, 2022 at 11:44 pm
Good Fix! Sir.
Humphrey Mndaka
February 16, 2022 at 8:27 pm
Welcome sir Yogesh.
Regards Humphrey
GIFT ELIJAH
February 24, 2022 at 3:03 pm
Thanks for this article.