Return Of DENON AVR-X500 In Dead Condition
This set revisited after a gap of around five years. Kindly see my earlier article : Protection mode in Denon AVR-X500 solved
That time it was due to set going to protect mode. But this time it was a case of totally dead. I opened the set and after doing a thorough cleaning inside, looked for any bulged capacitors or damaged components. I was shocked to see that the entire board was full of rusted components, apart from a bulged and leaked capacitor.
The following pictures would talk by itself and no elaboration is necessary:
I informed the customer and sent the full snaps of all the components that I found in this condition on the board. I have limited to a few in this article. He asked me to go ahead and get it restored as he liked its performance very much. This set indeed was neglected at-least for quite some time and that is the reason for such corrosion. If a set is used regularly and getting warmed up, corrosion might not take place to this extent. So, declaring a war, I took out my soldering sword and replaced all such rusted parts on the board.
These were plenty on the Amplifier board and not much on the uController board. Even the Tuner had rusted and corroded components inside, when I removed it and checked it up after opening the case. I replaced the electrolytic capacitors in it as well. After all these exercises were done, I rechecked the board and applied power and got our protection mode problem for which this was attended to in 2015. Did the same method of troubleshooting that I did last time and located defective transistors in the Central Section. Drilled holes after removing the SMD transistors and provided equivalent transistors in its place.
After this exercise, when I switched on, the AVR was working very well. I used all its functions and speaker outputs and everything was working superfine. I used the AVR for about a week before I ventured to call the customer to come and pick it up.
Bulged satisfaction got further enlarged and before it exploded, I let it get into the collection bag! (LOL) I have skipped many parts of my service in this article, for the sake of brevity.
(Note: I am not very sure of the snaps of SMD transistors given, i.e., there could be a mix up as I am writing this article after a long gap.) Here is the snap of total number of components replaced. (Looks like it has broken all previous records!)
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 National Tape Recorder Repair