Caution – Never Keep One Induction Cooker On Another For Testing – A Lesson Learnt
This Prestige Induction cooker was brought to me with the complaint that it became dead. Opened the set and found a lot and lot of dirt and dust inside, which I cleaned after dismantling the main board, fan, panel and mains cord.
On checking the main board, found one 10 Ohm resistor open in the SMPS primary area. On checking the primary of the SMPS with Ring Tester ( Jestine Yong is dealing with this wonderful tool!), one LED remained lit, indicating a short somewhere. I removed the PWM, as a premonition, and rechecked again.
This time all the LEDs glowed indicating that PWM was the cause. I replaced the resistor and did a thorough retouch of all the dry solder found on the board. Provided a good quality IC socket and fixed a new IC. Replaced all the electrolytic capacitors as a part of maintenance.
Replaced all the micro switches on the panel board, as these were found to be defective. Assembled back all the parts and took it for testing to my kitchen, as I did not have a high power connection inside my bedroom-converted-service shop.
Disconnected the mains cord of my Impex Induction Cooker and kept this on top of it, plugged in and switched on and found it to be working. Boiled a glass of water and Milk, which are required for my morning coffee.
Brought it back after it became cool enough to handle, fixed the screws on its back and transferred it to the delivery room (the sit out in my house! That’s when the new twist took place! After sometime, my wife reported that the MCB tripped when she switched on our Impex Induction Cooker! I too went and tried, yes, the MCB was tripping indicating that something has wrong with our Induction Cooker! Brought it to my service table, opened it and checked for any short of the IGBT. Yes it was short! On sharing my experience in our Technicians’ whatsapp group, I learnt that many such incidents have taken place! What makes it?
The induction generated, passes through the coil of the cooker kept underneath and reaches the IGBT and affects it! When I thought about it, there was a possibility! Here was the proof! I am covering the service of the Impex Induction Cooker, which I opened only after about seven years of its purchase. For the time being, after sharing this very valuable experience, let me pull the curtain, transferring the satisfaction of servicing Prestige Induction Cooker alone to the bag, filtering out the unpleasant experience!
This article was prepared for you by Parasuraman Subramanian from India. He is 69 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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