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A Water Pumping Motor Repaired On A Teeth Planting Device

By on February 4, 2022










A few dentists that I fixed devices for recommended me to this salesman and because of that; he brought me this device for repair.

motor repair

The device was powering on but the main issue was this motor that you see in the photo; it was not spinning. Usually the fault of these devices is caused by water damage.

When the dentist drills holes to plant a tooth, he uses water mixed with some kind of chemicals and usually it spills inside the machine and causes either a dead device or some parts in the device to stop working and I think this is the cause here.

servo motor repair

You can see the white residue on this motor and lucky me or should say the customer’s luck that this motor was not faulty because when I applied an external 12 DC  to the motor, it started to spin which explain one thing, the motor was not getting any power to run.

dry joints ic

I powered on the device and pushed the motor paddle to provide the motor socket with power but as expected, there was no power reading there.

I checked all these components and all checked fine.

pcb board repair

I took the board off and traced the power to the back of it and I found a lot of these components have cold soldering joints. Take a look

how to fix a dental equipment pcb

As seen in the photo, these soldering joints are not healthy and needed some tender loving care. I cleaned the area and used flux on all these connectors and applied fresh solder and hoped for the best.

pcb circuit board repair

This is the final re soldering results and I can see a lot of improvement but will this bring the right voltages to spin the motor, I was very optimistic.

motor not spinning repaired

Before I applied power, I saw some rust on the top of the motor rod so I cleaned and applied just a tiny drop of oil and powered up the device.

Yes, the motor started to spin and that was music to my ears. I called the guy, informed him of the good news and he came to pick up the device and I can tell he was happy with the outcome and paid very generously.

Mission Accomplished. 


This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous article on A Dead Welding Machine Was Brought Back To Life




  1. Tayo

    February 4, 2022 at 10:27 am

    Very nice.
    Im learning to reflow all old joints on any PCB that has that dull lead look to it.

    • Waleed Rishmawi

      February 4, 2022 at 1:45 pm

      Tayo: that is a very good procedure. Have a blessed day

  2. Parasuraman S

    February 4, 2022 at 12:59 pm

    Another laudable device saving work done by you! Great!

    • Waleed Rishmawi

      February 5, 2022 at 2:55 pm

      Parasuraman: thanks man. have a blessed day

  3. Albert van Bemmelen

    February 4, 2022 at 1:46 pm

    Good job! Just to make sure it doesn't happen again it would be a good idea to also like in Washing machines and Dryers is common sense to varnish the pcb with some protective layers against rust from moisture.

    • Waleed Rishmawi

      February 5, 2022 at 2:57 pm

      Albert: thanks man. varnish is a very good idea but customer no interested and inssisting that he will keep the hose that drains water and chemicals aways from the device. have a blessed day

  4. Mathew Charles Karonga

    February 4, 2022 at 2:44 pm

    Greetings Waleed Rishmawi

    Excellent repair

    Our suspicion is the starting point to any repair

    well explained and well done

    • Waleed Rishmawi

      February 5, 2022 at 2:59 pm

      Mathew: hi. thanks man. a very true statement and always look not just to the fault but what is causing the fault. have a blessed day

  5. Imoudu Onwumah

    February 4, 2022 at 2:54 pm

    Good repair!!!without adequate experience one wouldn't have thought the problem is just desolder.well done friend.

    • Waleed Rishmawi

      February 5, 2022 at 3:00 pm

      Imoudu: thanks man. indeed. have a blessed day

  6. Babu M S

    February 4, 2022 at 9:47 pm

    Fantastic repair work.Learned how to solve the problem.Thank you very much for sharing.

    • Waleed Rishmawi

      February 5, 2022 at 3:00 pm

      Babu: thanks man. you are most welcome and have a blessed day


    February 5, 2022 at 11:31 am

    Its very good idea additional improvements for the newly technicians with details datasheet.
    Thanks Mr Waleed.

    • Waleed Rishmawi

      February 5, 2022 at 3:01 pm

      Fernando: thanks man. you are most welcome and have a blessed day

  8. Yogesh Panchal

    February 5, 2022 at 7:34 pm

    Waleed, Every time you providing us new adventure By repairing stuff like this.

  9. Waleed Rishmawi

    February 7, 2022 at 6:36 pm

    Yogesh: you are most welcome my friend. I am glad you licking the articles. have a blessed day


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