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A Dental Drilling Device Powers On But The Drill Not Rotating Repaired

By on December 16, 2023
A Dental Drilling Device Powers On But The Drill Not Rotating Repaired






A technician guy brought this device for repair. He said that this device has been sitting in the storage room for a while and when he tried to use it, the drill was not rotating.

dental driller repair

That is an expensive device; it has dual voltage setting and a foot switch to control the drilling.

It might be a power supply, foot switch or the actual drill issues and there is one way to find out. Let the repair begins.

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I dusted it as much as possible so I can see what I am doing. I could see a shiny capacitor in this device and I wonder if some worked on this device before.

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There was not voltage reading coming out of this device which gave me the indication that the power supply is the main fault so I am going to start with that.

The green LED light was not coming on and I could see a lot of cold soldering joints on that board. So I am going to reflow all these joints and hope for the best.

repair dental drilling machine

First I replaced the green LED light with a red one and I also replaced the main capacitor. Since it has been sitting in the storage room for a while so I thought replacing that capacitor, even it looks new, is such a good idea.

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I powered on the device and I could see a red light coming on and I could see voltage readings being registered on my multimeter and that is a very good sign.

how to repair a broken dental drilling device

It seems like 1.3 is the lowest voltage setting I think it goes all the way to 30 volts.  I connected the drill to the machine and for some reason it was not rotating. I connected the drill to my external power supply and added 15 volts to it since it can handle 1.3-30 DC volts but the drill was not rotating. I asked the customer to bring a working drill and it worked just fine.

The customer was happy with the outcome and he mentioned something about buy a new drill to be used on this machine.

Mission Accomplished.

waleed Rishmawi

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 Toaster Oven With One Of A Heating Element Not Heating Up Replaced




  1. Parasuraman S

    December 16, 2023 at 3:02 pm

    These drills collect dental plaque, blood and other hard particles whenever a procedure is done. Unless the drill is cleaned immediately after its use, this gets dried up inside and it would prevent free movement of the rotor. Then the torque increases and the motor would stop if there is a protection circuit or coil might get burnt. Well done!

    • Waleed Rishmawi

      December 19, 2023 at 2:34 pm

      Parasuraman: thanks man. yes it was nasty inside the drill but since he had an brand new to use I did not bother with the drill itself but focused on the power supply that provides the right voltages to operate. have a blessed day

  2. Yogesh Panchal

    December 16, 2023 at 4:48 pm

    Good repair! Waleed

    • Waleed Rishmawi

      December 19, 2023 at 2:34 pm

      Yogesh: thanks man. have a blessed day

  3. Albert van Bemmelen

    December 16, 2023 at 7:44 pm

    Since both the drill and the adjustable voltage power supply were defect the drill motor likely destroyed the power supply. Why probably the primary fuse was still intact because of the power regulator chip that prevented more damage. Luckily the customer had a good working drill to test the power supply with afterwards, to make sure the repair was successful.

    • Waleed Rishmawi

      December 19, 2023 at 2:36 pm

      Ablert: yes indeed totally agree with that my friend. thanks for your input on this. have a blessed day

  4. jai Etwaroo

    February 9, 2024 at 10:21 am

    Nice job Waleed.


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