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Onkyo tx-6500 mkII needs some repairs

I don't expect this to be the problem source per se, but the circled solder joints on this board look suspect from the photo. Looks like heat stress cracks circling the pins. I'd look very carefully at these and the board holding the protection relay (bottom side of receiver). You'll need to unscrew that board to look at the traces. As was mentioned earlier, this receiver is not really for the first timer, but that's your call, not ours. There's really not enough detail in these small files to zoom in and do a better inspection over the net. Get bright light, a magnifying glass, etc to really look at those joints. I don't really see any board scorching, and your main caps look fine visually, but repeated use of a faulty system could cause them to vent if they overheat or get overvolted.

If you are determined to do some work yourself, build a Dim Bulb Tester before you power up the unit again. You'll need a 100W or even higher wattage bulb to check a big amp like this. But, it's great in preventing bigger problems from occurring while you troubleshoot and work on it. It may even give a clue as to why it's shutting down.
 
jheu02 said:
I don't expect this to be the problem source per se, but the circled solder joints on this board look suspect from the photo. Looks like heat stress cracks circling the pins. I'd look very carefully at these and the board holding the protection relay (bottom side of receiver). You'll need to unscrew that board to look at the traces. As was mentioned earlier, this receiver is not really for the first timer, but that's your call, not ours. There's really not enough detail in these small files to zoom in and do a better inspection over the net. Get bright light, a magnifying glass, etc to really look at those joints. I don't really see any board scorching, and your main caps look fine visually, but repeated use of a faulty system could cause them to vent if they overheat or get overvolted.

If you are determined to do some work yourself, build a Dim Bulb Tester before you power up the unit again. You'll need a 100W or even higher wattage bulb to check a big amp like this. But, it's great in preventing bigger problems from occurring while you troubleshoot and work on it. It may even give a clue as to why it's shutting down.
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I'll get to looking at it closer. If this becomes too much I'll take it to a shop, I don't wanna be the guy who goes Rambo on this thing only to mess it up more. I figured if it was something I could, I would try. Just seeing the inside gives me more respect for it. I think something got wet based on what I see inside. The big power adapter is my concern. But then again, I don't know Jack so I guess we'll see. I do appreciate your help. If anything I can learn some new things.
 
We have not truly determined if his relay is tripping or if he has switches and pots to clean. Learn about Deoxit, spend the money and get some and do a thorough cleaning of your switches and potentiometers well before you pull out a soldering iron. BTW, you can use Windex to clean boards etc.
 
KingBubba said:
We have not truly determined if his relay is tripping or if he has switches and pots to clean. Learn about Deoxit, spend the money and get some and do a thorough cleaning of your switches and potentiometers well before you pull out a soldering iron. BTW, you can use Windex to clean boards etc.
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Gonna have to goggle some of that stuff you're talking about. I like my tunes but this is taking things to another level for me. Do appreciate your help!
 
Search in AK. Look for Idiots Guide to Dexoit use. Learning about this first will open up a whole new world of possibilities for you and the use and maintenance of vintage stereo equipment. If you learn about the use of Deoxit and then learn about how to refoam speakers, you will be able to pick up some great gear for cheap with the confidence that you can bring it back into working shape. You will then have a shelf full of the nicest equipment anyone has ever had. That Onkyo of yours is one fine piece of gear. It is known for its power and one of the best tuners of its time, and that is saying a lot when you look at its competition in its day. I have the TX-8500MkII, freshly rehabbed by blhagstrom and, OMG, what a sound. Take your time, ask questions here on AK and you will be able to do stuff you never considered before. AK is a great place to learn
 
Agreed. I was just suggesting a closer look at the solder joints since some seemed suspect. If it was a deoxit solvable issue I would think that it would be present upon startup, not after a short delay. But one thing that can be done as a quick test, even without deoxit, is exercising the knobs and switches a bunch of time (power off) to do a minor abrasive cleaning. If things come back to normal, then you'll definitely want to do a proper cleaning with deoxit.
 
I looked at other images than posted here online where the mains caps look nice then see the ones that blew underneath noted by John. been a few in the series models with similar blown or failed of age. It all starts at the power supply and if you wish to test then the dim bulb tester is essential. I'm banking on it is the mains caps as can internally short and not blow the guts as just beyond expected cap. life. The unit was made from 79-81')

I have to credit at least the protect circuit is working and unit pretty clean. Even after mains caps replaced you or a good shop would perform other tests. So I say get it to a reliable shop or tech.

Finding some new mains caps might take some digging. but shop must assure some kind of warranty imo.
 
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