Servicing Sony TA-V10 Amplifier
This amplifier was brought to me with the complaint that one channel is not working. Checked up and confirmed it was true. Opened the set and cleaned it thoroughly and lubricated all the controls and connectors. Patched up a few dry solders and checked ESR of capacitors and found these to be in condition.
This amplifier has a relay protection circuit. So, checked up the contacts of the relay and found these also to be working fine. Fed audio signal at the input and traced it with oscilloscope at various stages and found these to be ok. Used headphone and tested the signal and found the output perfect and balanced. Perhaps some dry solder or dirt collection was the problem. Have a look the inside of this amplifier. This amplifier uses STK series module as its power amp.
Some work like this comes easy, though occasionally. When this was brought to me, I was expecting a challenge to solve, but did not provide enough thrill, though the satisfaction list got added!
This customer was a deserving person to do a free service so I did not charge him anything!
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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