Lightning Struck On Telephone Repaired
A landline telephone was brought to me with the complaint that after a lightning strike, it went dead. After opening and cleaning the set, I observed that one capacitor had bulged.
Replaced it and checked ESR of other capacitors and were found these to be in the brim.
So, I replaced all of them and connected Telephone wire and found it to be working perfectly well!
This telephone has facility of caller identity, which works when connected to the Telephone line. As we might all know, telephone works on the DC voltage that comes through the telephone wire, along with a dial tone.
These are segregated and used by a circuit inside the instrument, which works on the DC voltage. For more information on how the telephone works, kindly see the following link:
https://electronics.howstuffworks.com/telephone1.htm
A very simple task, finished so soon! (Of-course to my satisfaction!)
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/servicing-fairmate-cs650-tape-recorder/
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Andrew F. ali
May 11, 2018 at 8:16 pm
Great job, Sir.
Robert Calk Jr.
May 11, 2018 at 9:33 pm
Good job, Parasuraman.
Humberto
May 12, 2018 at 12:33 am
Good repair Mr. Parasuraman. Thanks for the website you have posted, very interesting.
Albert
May 12, 2018 at 11:49 am
Those modern electronic and other telephone devices are normally not fixable after a direct lightning struck. Mostly because of the DTMF chip that is completely destroyed. The customer was lucky you were able to pinpoint the defect on the bad capacitors. Only those old T65 Telephones survive a direct lightning struck by replacing two bigger diodes on the input lines. After that the phone operates like new as if it was never hit by lightning before!
Temitope
May 12, 2018 at 9:12 pm
A very interesting repair. Is there a good way of protection against thunder strikes through the use of electronic devices? be it small scale or large scale? I will very much love to hear from our Papa's in the house. Thanks
Yogesh Panchal
May 14, 2018 at 12:04 am
Good job Sir.
Emmanuel
May 18, 2018 at 9:56 am
Good thing I have liked it