Servicing Frontech Multimedia Speakers
This belonged to my son living at Bangalore. The complaint was brought to my attention during one of my visits, that there was no output. I have the habit of buying and storing the minimum tools required for servicing in almost every relatives’ house, as one thing or other might be defective during my visits and I wanted to make my time fully utilized by the hosts. I carry all the special instruments and special tools required for intricate jobs during my tours.
I have the habit of making a service camp too, occasionally, in places like Chennai, where more number of my relatives are living. I spend around a week or more doing service there, keeping my base in my elder brother’s home, as he himself is an electronic stalwart and has all required tools and instruments for service, but does not do much because of age factor.
I believe that our talents and skills should be thrown open to our own family members, as ‘charity begins at home’ is what the old adage puts it! Life is not for making money alone, pleasure seeking alone; it is meant for doing what best each one of us can do to others, to our country, to this world! Another thing what we need to do is share our knowledge and experience with others. That’s why I put so many efforts in writing these articles! Donating knowledge to others is the most important in various known deeds!
Ok, ok, enough with my trumpet, let us get to the service side of the unit! I turned one of the study tables of my grandchildren, as service table. Used a filled stainless steel water jug as solder stand (you can see it in the background of second picture above) and such some ‘make shift’ arrangements to ease my trouble shooting.
I opened the set and did a general cleaning. There was not much dust inside it. Removing the PCB is a tricky thing, as we need to pull off the silver panel, unscrew the holding nut of volume control and remove holding screws and take it out.
Checked and found that the EP pin was open inside; the real cause for ‘no output’! Replaced the pin, fetching it from a local market and did a thorough dry solder patch up and checked ESR values of capacitors.
Found these to be out of range and replaced all that. Checked and found the unit working very well.
Added one more satisfying job to the already bulging list!
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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You may check on his previous repair article below:
https://jestineyong.com/defective-graphic-equalizer-led-array-found-in-sony-stereo-deck-receiver/
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Paris Azis
May 13, 2019 at 8:56 pm
I fully agree with your thoughts Parasuraman, beyond the repair itself.
I enjoyed it indeed!
Robert Calk Jr.
May 14, 2019 at 1:10 pm
Hi Paris. I am glad to see that you are still kick'in!
Saqib
May 13, 2019 at 9:37 pm
Nice repair. what is output AC voltage and current ratings for transformer used in this circuit?
Parasuraman S
May 14, 2019 at 6:59 am
Sorry, I forgot to note down! I think the DC required is 12V for this IC.
Ghashaan
May 13, 2019 at 10:29 pm
I'm inspired by your concern for humanity. I like the way emphasized that we can utilize any of pur skills or talents for humanitarian causes.
So far, I've enjoyed all of your technical demonstrations.
Keep it up, Parasuraman. Your heartfelt efforts won't go unnoticed.
Yogesh Panchal
May 13, 2019 at 10:42 pm
Good job! Sir
Albert van Bemmelen
May 13, 2019 at 11:42 pm
Making money is not the main reason we repair for friends and relatives. But it sadly also means we never make much money this way anyway. But being able to fix things is fun no less.
After Googling I found DIY EP Stereo 3.5mm Jack Aux to RCA. Abbreviations like 'EP' are probably well known to English speaking Audio amplifier engineers why I never heard them before. Still have no idea what EP stands for. I found 'Extended Play' but that doesn't seem to explain much?
Parasuraman S
May 14, 2019 at 11:13 pm
EP stands for Ear Phone!
beh
May 14, 2019 at 10:54 am
I 100% agree with your words about our responsibilities to transfer our knowledge to others before being too late and also about our environment and country. And thanks about article but please tell me what is EP pin?
Parasuraman S
May 14, 2019 at 11:15 pm
EP stands for Ear Phone!
BEH
May 15, 2019 at 12:03 pm
THANK YOU SO MUCH.
Robert Calk Jr.
May 14, 2019 at 1:15 pm
Good job, Parasuraman! I agree with your trumpet! I also agree with Albert in that I can't remember ever hearing of an "EP pin".
Parasuraman S
May 14, 2019 at 11:16 pm
EP stands for Ear Phone!
Parasuraman S
May 14, 2019 at 11:15 pm
EP stands for Ear Phone!
Lynn Blakely
May 15, 2019 at 2:41 am
After looking at several data sheets, Pin 2 was labeled Vcc. E normally in the US means Voltage, P means Power. So that's my understanding of the designation of "EP". Very good repair with complete description of repair.
Parasuraman Subramanian
May 16, 2019 at 10:33 pm
EP stands for Ear Phone
cipriano olivar
August 14, 2020 at 7:10 pm
tengo unos altavoz muy parecido y la información me sirve de mucho,muchas gracias hermano por todo.
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I have a very similar speaker and the information helps me a lot, thank you very much brother for everything.