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Drilling Machine Repaired

By on January 14, 2022
drill repair

A customer brought this drilling machine for repair and explained the issue to me. He said if he wiggles the power cord, the machine would work but he starts to see sparks then the machine goes into shut down.

handrill machine repair

The customer put an electrical tape around the cord and according to the customer it worked for awhile then the problem started.

I think it is a power cord issue but let us find out for sure.

bosch hand drill repair

There were three screws holding the black cover piece and once these were out I was able to see where the two wires meet with the power switch.

how to repair bosch drill

As seen, very dusty areas near the power switch but I will clean that area later one once the repair was done.

how  to fix hand drill bosch

I connected the drill to my current limiter and powered on the drill machine and right away I could see smoke coming out from power cord area but not near the power switch.

Once the defective area was found, it was time to trim it out and connect the good part directly to the power switch.

broken cable

This is the defective part of the power cord and after cutting it off.

power cable cut off

The defective part of the power cord was the brown wire and you could see burnt marks on that.

fixing cable

Before connecting the power cord to the power switch I decided to add these metal shields for better stronger joints.

how to fix a broken bosch hand drill

I added and pressed the metal shield parts on the two wires, connected both of them to the power switch and fired up the machine; it worked like a charm. I put everything back together and called the customer for pick up.

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 Faulty Transistor Caused LED Blinking



  1. Anwar Y Shiekh

    January 14, 2022 at 7:39 am

    I once got a refurbished power drill that would now and again stop working; turned out one of the carbon bushes was not running easy in its carrier. A little sanding and some silicone oil and it's been fine ever since; guess that is why it we returned in the first place.

    • Tayo

      January 14, 2022 at 12:20 pm

      Wait... wouldn't lubricating the brushes with grease cause the brushes to lose contact with the commutator? Or cause carbon buildup?

      • Waleed Rishmawi

        January 15, 2022 at 1:49 pm

        Tayo: I totally agree with you, lubricating the brushes with grease not needed in such machines. the only part needed lubrication is the motor itself but only a one dot of oil, nothing more. have a blessed day

    • Waleed Rishmawi

      January 15, 2022 at 1:47 pm

      Anwar:I do not think silicone oil was needed to crease the bushes, sanding alone would have done the job on its own. any way, thanks for sharing and have a blessed day

  2. Parasuraman S

    January 14, 2022 at 10:13 am

    Very professional fix! Well done!

    • Waleed Rishmawi

      January 15, 2022 at 1:50 pm

      Parasuraman: thank man, you are such an encouragement to me. God bless you and have a blessed day

  3. Gary Drumm

    January 14, 2022 at 1:34 pm

    Good article, and I especially liked the addition of the metal shields. I had never seen or heard of them before. I will look for some on ebay.
    I always enjoy reading your articles, and those of Parasuraman. They always deal with do n to earth type problems. Keep up the good work.

    I am adding this footnote, because I believe that things are soon to reach a fever pitch worldwide, and I want everyone to get right with God before the end comes. Please accept it in the admonition with which it is given. Thank you, and I admonish you to believe in Jesus Christ, that he is the only begotten son of God, and call upon him to receive salvation, and you shall be saved, and all of your household.

    • George Nutzul

      January 14, 2022 at 4:56 pm

      Right you are, Gary... we are in the end times. Jesus is the key to eternal life.

    • Waleed Rishmawi

      January 15, 2022 at 1:54 pm

      Gary: thanks man. these metal shields are easy to find and very important to use on such wires. I am glad you are enjoyng the articles and that is a very big encouragment to me and I am sure it is for Parasuraman.
      Yes, I accepted Christ as my saviour when I was 18 years old, I am now 55 years old and since then the Lord is good and have been blessed with a lot of things, an amazing family, job and most of all everlasting life with Christ when He comes back to take us home. thanks for sharing that message of hope. God bless you and have a blessed day

  4. Albert van Bemmelen

    January 14, 2022 at 2:02 pm

    Good repair Waleed. Although it hardly requires your excellent knowledge in electronics, and neither really is about electronics either.

    • Waleed Rishmawi

      January 15, 2022 at 1:56 pm

      Ablert: thanks man. Yes I know this repair it not an electronic repair article but there a lot of people out there need such repair because it happens all the time. have a blessed day

  5. Imoudu Onwumah

    January 14, 2022 at 2:58 pm


    Thanks for that short piece of admonition.You are very right.

    • Waleed Rishmawi

      January 15, 2022 at 1:56 pm

      Imoudu: thanks for your comment and have a blessed day

  6. Yogesh Panchal

    January 14, 2022 at 3:29 pm

    Good Job! waleed

    • Waleed Rishmawi

      January 15, 2022 at 1:57 pm

      Yogesh: thanks man. have a blessed day

  7. Lynn Blakely

    January 15, 2022 at 12:18 am

    Thanks as always to those that share their experience with other techs.
    This shows Love to our fellow man. Yes we are to forgive also,as Jesus forgives us,if we ask.

    • Waleed Rishmawi

      January 19, 2022 at 4:38 pm

      Lynn: you are most welcome. yes, very true to forgive others as Jesus forgave us. have a blessed day


    January 17, 2022 at 11:14 am

    Good job Mr. Waleed

    • Waleed Rishmawi

      January 19, 2022 at 4:39 pm

      GIFT: thanks and have a blessed day


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