Servicing Onkyo HTR-430 AV Receiver
This AV receiver belongs to my elder brother staying in Chennai. As there was no output in the set, he asked me to look into it, during one of my visits to his home.
Though I brought this heavy set with me, using foldable trolley (specially bought for this) in my return journey by train, in March, 2017, I could take it up for service only by December, 2017. The set will come on, but there was no output even in Headphone.
I opened the set and did a thorough cleaning and lubricated the various connectors and again switched it on to see whether it was working. But no. So, dismantled the entire set, which had multiple boards.
While doing this, I noticed that one .22F/5.5V cap was rusted on the tuner control board. As this is normally for storing memory in power off mode, I ordered for the part and removed it for check up, knowing very well that the ‘no output problem’ has nothing to do with this. Look at the funny value it was showing in my Capacitance Meter, which was not having the range to measure it.
Continued my trouble shooting and as a routine I checked up the Headphone socket and observed that it had a minute crack on the PCB.
So, removed the PCB and checked it and found that it had cracked from one side to another side. So, scraped the tracks and provided a jumper wire and refit the PCB.
Fed audio signal to the input and using a headphone, checked up whether the output was coming. It indeed was! So reassembled the PCBs back in its place and played a Video. It was working superfine.
I had bought two capacitors in place of the one rusted .22F, as getting that part was not very easy. So, placed the spare one keeping it inside a polythene cover and sticking it on the board, for any possible future use. Refit the cover and run the set for several hours and tested all the speaker outputs. It was working very well. I checked all its functions too.
Thus the satisfaction list continued its growth!
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-sony-ta-v10-amplifier/
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doraiswamy SR
August 9, 2018 at 1:07 pm
Sir, your contribution in reviving the discarded electronics equipments are amazing.. i enjoy the way you narrate the repair work as a story and finally the "satisfaction" sentence feels very nice. the article is very interesting and seems that i had done the servicieng by myself.
keep it up sir
i would be awaiting your articles on embedded systems equipments servicing and expecting you excel in this also
James
August 9, 2018 at 4:22 pm
You Rock dawg'', just wish the pics were more clearer 🙂 LoL but your teachings are extraordinarly fine''. 😉
Suranga Electronics
August 9, 2018 at 6:03 pm
Good Repair ! Well done..
Our Audio Expert.
Mr, Parasuraman
Tyrone Arendse
August 10, 2018 at 1:16 am
Thank you for your sharing your knowledge
Robert Calk Jr.
August 10, 2018 at 3:16 am
Good job, Parasuraman.
Albert van Bemmelen
August 10, 2018 at 4:58 am
Removing all boards and even the checking them out wired outside of the original big metal housing is a very tedious job. About measuring the ESR value of supercaps with a ESR meter, this can only be done apparently with a fully discharged supercap to prevent destroying your meter because of the high DC current. There is a great article about it here: https://www.instructables.com/id/How-To-Test-Super-Capacitors/
And there is also a supercap capacity calculator here: https://www.maximintegrated.com/en/design/tools/calculators/product-design/supercap.cfm
Humberto
August 10, 2018 at 10:06 pm
Thanks for sharing your article, Parasuraman. You are a MASTER.
R Murali
August 27, 2018 at 3:33 pm
great job. Thank you for Sharing