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Hand Drill Not Rotating In Dental Device Repaired

By on December 29, 2021
harpoon1 repair








A technician brought this device for repair; he explained that the hand drill attached to the foot paddle that gives the command drill to rotate not working and needed a checkup.

adin harpoon1 repair

With the hand drill attached to the foot paddle and the main device,

I powered it on and I got this message on the display of the device.

how to fix harpoon 1

This is the foot paddle device that gives the command to the hand drill to rotate but something was wrong. The logical thing to do here is locate where the fault is; is it the paddle or the actual motor or the wiring? Let us investigate and find out.

how to repair harpoon 1

According to specs, I was supposed to get 5 DC volts here and I according to my meter, everything according to specs.

The next step is to check the wiring and find out if I was getting the right voltages there or not.

how to fix and repair harpoon 1

This is the inside of the actual hand drill and as seen, the control pins and the voltage pin are located. If you look closely, you would see the V sign and when I checked for voltage reading there, there was none.

connection problem

As seen in the photo, the red wire that supplies the voltage to the motor was loose and when I cleaned the area and re soldered the wire back, I got this message on the display. Take a look

how to fix a broken dental equipment or device

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.

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Note: You can check his previous article on An Iphone 5C With A Bad Speaker Replaced




  1. Babu M S

    December 29, 2021 at 10:37 pm

    Your really great,attending the fault very quick in logical way. Thanking you very much for sharing.

  2. Albert van Bemmelen

    December 29, 2021 at 10:54 pm

    Quick and professional repair. Another expensive dental device made ready for duty!

  3. Anwar Y Shiekh

    December 30, 2021 at 1:38 am

    One gets a feeling that moisture got in; I'd be tempted to spray in some silicone oil to help repel moisture. Then again, not all my ideas are sensible.

  4. Gary Gemmell

    December 30, 2021 at 5:22 am

    Most of the time its the easiest thins to check first like loose wires or bulging caps!

  5. Parasuraman S

    December 30, 2021 at 11:04 am

    Very precise troubleshooting as usual by a professional! Another lucky customer!

  6. Yogesh Panchal

    January 2, 2022 at 5:06 pm

    waleed, good quick fix!


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