Mosquito Racket Repaired
Fault Symptom: Battery gets discharge quickly and output spark is also low.
So on physical inspection everything seems ok & no burn marks or any physical damage. So first I took battery charging section for checking battery draining fault.
First I have checked the Battery it shows 2.4V DC on multimeter this reading matches as per printed value on the battery. I.e. Battery is ok.
I have traced the circuit and checked diodes, transistor (Suspected Leakey but found ok) and resistors found ok. So it is time to check the Hi voltage capacitors.
so I took out capacitor belong to the battery charging section as well output capacitor which is connected to mesh
Checked this capacitor on ESR Meter look what it shows 470nf capacitor is showing 196.3nf that is out of range so conclude this capacitor is bad
So replaced both the capacitors
After replacing the capacitors I have reassembled the racket and kept the racket for the charging for 5 hours after that I have been using it for one week without charging that means problem is solved.
Because bad capacitor it is not passing voltage & required current for battery charging.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Jestine Yong works as an Electronics Repair Lecturer in Kuala Lumpur Malaysia and his training website is http://www.NoahtechElectronicsTraining.com. You can check out his repair blog at http://www.JestineYong.com
17 comments on “Mosquito Racket Repaired”
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It’s great to me I get more experience thanks very much.
You are welcome!
Watch out Mosquitoes..well done on the repair.
Thanks for comment waleed.
Those bad capacitors are always spoiling a otherways good product! In my country these Rackets are sold without rechargable battery. Two penlight batteries are used instead and placed in the handle. They are easily replaced by rechargeable ones if need be.
Albert, I had plan to put one 18650 single Battery Cell which i have salvaged from some of bad laptop battery pack but size is issue.
A job well done!
Can you tell me about the ESR meter that you’ve used?
Thanks for comment Ghashaan ,
This is LCR Meter M328 Series, My niece and his Team has bought this meter for troubleshooting their College robotics projects.
Excellent & very useful guidance
Thank you Sir.
Thanks many for this fix. I have a racket with similar problem if not same will use this to repair of racket.
You are welcome! Jams
Basic Troubleshooting Fundamental is same.
Good repair Yogesh. Congratulations.
Thanks!
Humberto
Good job.
Thank you! Devon
Thanks for your excellent way of explaining the issue and addressing the same.Hats off.