Return Of Panasonic RX-M70M2 Two-In-One With Mains Transformer Failure
This set belonged to one of my regular customers and he brought it with the complaint that his wife saw smoke coming out from the rear and the set became dead. This had visited me around one and half years back in dead condition. That time, I had replaced all the electrolytic capacitors in the board and did thorough dry solder patch up.
Also fixed the FM/USB module on the Cassette Door, as they did not want to use the tape. The reason for failure was dry solder and component failures at that time.
Before opening the set itself, I checked the primary of the Mains Transformer, after checking and ensuring continuity of the power cord and found it to be open. So, I knew very well what needed to be done, before opening the set itself.
After opening and doing a general cleaning, I rechecked the TX from inside and confirmed it to be dead. I had noted down the secondary of the TX during my last repair and it was 0-7.5V, 1A. I had a replacement TX with me and I removed its clamp and fit the original clamp, without which it cannot be fixed inside. Then powered it up keeping the TX outside itself and found all functions working fine. So, fixed the transformer and wired these like before.
Just kept the front cover, which had the speakers fit without fixing the screws and tried Blue Tooth, USB and its own Radio. Everything worked just fine!
In the following picture, look at the battery compartment, where you will find packets of components replaced last time and the parts of tape that I removed to accommodate the USB/FM module.
Here is the picture of the defective TX, by concluding this article and declaring about satisfaction that got added!
This article was prepared for you by Parasuraman Subramanian from India. He is 72 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 article on Bang Olufsen Tape Deck Repair