Transformer Failed In USB Player
Those of you who have not read my previous article released in October, 2017, may kindly see the same to know the background of this USB Player: https://jestineyong.com/servicing-and-modifying-jvc-rc-ex40v-three-in-one/
This was brought back to me with the complaint that there was no display. As we all know, a fully dead condition most of the time, indicates power supply failure. So, I opened the set and checked for the fuse, which was blown! What caused it to blow was the next probe. When I checked the primary of the transformer, it was found open. It was a 230 to 7.5-0-7.5 V AC, 500mA transformer.
Most probably a spike in the input voltage could have killed this Transformer, which worked faithfully for the last 3 years! I desoldered the wires and removed it from the case. Replaced it with a new one from my stock. Replaced the fuse also. Powered the unit and found it to get back its life! Played USB and FM through my Amp and found these to be working just fine! So closed the case, fixed it with tape like before!
Mission accomplished quickly, but without any omission of satisfaction getting added to its collection bag!
This article was prepared for you by Parasuraman Subramanian from India. He is 70 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: