Mosquito Racket No Spark Repair
On visual inspection everything seems OK. no physical damage. while pressing high voltage trigger switch Red LED Light up.
still no spark while touching the net using screw driver.
So for further inspection I disassembled the Racket.
RED LED Lightup when pressing Trigger switch it indicates Up to Battery charging circuit ok. Checked Diode /Main Transistor /Transformer on cold testing seems OK.
Now need to check High Voltage circuit. Checked diode on charging circuit side found OK…..
Checked Diode On High voltage side all of three Diode showing Open circuit……
I found the culprit & desoldered the Diodes & I arranged 1N4007 diode from my parts box …suddenly I checked printed code on the Bad Diode, it is RFC 4K (It is 4000v Diode) & you cannot check the high voltage diode on normal diode test mode in Multimeter for open circuit.
So re soldered these diodes back on its location…… so how to check high voltage Output more than 1500V DC.
So what I did, for testing Spark on high voltage O/p Capacitor I removed one side wire of the Net from the high voltage o/p capacitor.
There are 3 Nets Installed & Plastic insulator fixed between each net which work as net separator. So that one net is not get touch with another net. If nets are shorting to each other, then Battery will drain fast & Racket is becomes useless till you charge it again.
& by pressing trigger switch I touched O/p capacitor pins & I got loud bang spark noise with spark of light.
It indicates High voltage is Ok ……then where is problem ……May be wires connected on the Net is damaged …. I opened the net housing check wire for continuity everything is Ok……. now what why there is no spark on the net……????
I am also confused……. now I am thinking & playing with Multimeter…. I exclaimed what is this??
Playing with Multimeter on beep mode and touching both the lead which produce beep sound & arranging some block in my mind for any clue I just put both the probe on one outer net on beep mode. but it does not reflect any result i.e. any resistance or beep …. wait a minute …. this is Aluminum Net & it should beep while touch …. I scratched one wire & checked again now it beeps….it means Aluminum is fully oxidized because of Moisture… (it is rainy season is going on.).
Now disassemble and scrub all the 3 nets is time consuming…so for saving the time what I did; I started my Gas stove & slowly moved the net side on it so that Moisture get cleaned…. after the process I checked for the spark & I got bang noise Spark everywhere on net wherever I touch with screw driver & it works like new.
Racket is repaired successfully.
Now my block arranging work is finished in mind & look what I noticed….
This is how I saved my time…. Lol
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles on Repaired HDD Which Continuously Going To Auto Recovery Mode In Windows 10 With Blue Dump Error
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Parasuraman S
August 5, 2023 at 4:30 pm
Very strange experience for an electronic technician! Good that you could fix it at-last after putting in a lot of effort. This is the first time I heard about this possibility and now I know why a few bats did not work after I did what best one can do! Many, many thanks for this wonderful tip!
Yogesh Panchal
August 7, 2023 at 3:03 pm
Thank you! Sir
Some time problems are beyond our imagination.
Waleed Rishmawi
August 5, 2023 at 4:58 pm
enjoy zapping flies..etc. thanks for sharing. I never opened one before. have a blessed day
Yogesh Panchal
August 7, 2023 at 3:04 pm
Thank you !Waleed
Aqib Idrees
August 5, 2023 at 5:10 pm
Next time use electrolysis to clean the oxidation or strong acid
Yogesh Panchal
August 7, 2023 at 3:05 pm
Thanks! Aqib for your feedback.
Albert van Bemmelen
August 5, 2023 at 7:27 pm
Not exactly clear what you meant with the message on the last photo about the melted plastic inbetween the nets but if it was fixed is all that matters!
I use a small lithium 18650 operated DIY HV taser to zap those pesky fruit flies to kingdom come! Because hitting them with a mosquito rack is completely useless.
Jim Whalen
August 7, 2023 at 1:50 am
He heated it so it would dry faster, I believe he said
Yogesh Panchal
August 7, 2023 at 3:26 pm
You are right, my concern is to fast evaporate Moisture By heating it,
Thanks! Jim
Yogesh Panchal
August 7, 2023 at 3:10 pm
Albert, I meant Racket is successfully repaired But Inner insulator plastic design shape is gone. you can compare Second photo & Last photo.
i would definitely like to know more about your 18650 project.
Steven
August 5, 2023 at 10:09 pm
My brother in law had a small one of this mosquito zappers and found a mosquito on his CPAP machine and killed it along with the CPAP device
Yogesh Panchal
August 7, 2023 at 3:28 pm
Thanks! for your comment Steven
Anwar Yunas Shiekh
August 5, 2023 at 11:16 pm
I like how the new bug zappers are using UV LEDs; the old bulbs didn't last long.
Yogesh Panchal
August 7, 2023 at 3:31 pm
Anwar Yunas Shiekh,
Yes both having their own life span.
Imoudu.O
August 6, 2023 at 3:22 am
This is a very good attempt and you succeeded in fixing it, I once bought this mosquito net on instinct without needing it and never use it for two years, after which I brought it out for use and it never work again....Know what I did ? carbage it.
Yogesh Panchal
August 7, 2023 at 3:35 pm
Imoudu.O,
Battery used in mosquito rackets are only last when you Charging it once in 15 days...in your case I think battery was the culprit.
Thanks! for your your comment.
Imran
August 6, 2023 at 5:35 am
Good fix Mate 🙂
Yogesh Panchal
August 7, 2023 at 3:36 pm
Thanks!Imran