Question about Yamaha RX-497 2 Channels Receiver

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My Yamaha RX-497 bought 3 weeks ago. It was good power and perfect. I did try to connect one set of home JBL(8 Ohm) big speakers and 4 more small speakers( ? Ohms). Then 4 or 5 times system automaticaly main power shutoff when playing. Now volume power change to 1/2 and middle tone is very low volume. Almost bass and treble only. I think I made some damages on system. How could I fix the system.

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  • samjang Sep 17, 2010

    Thanks, I have the tools in my home and I am a computerized player piano install man.

    Could I fix by myself ?

    I want to fix by myself. But I am afraid a little bit.

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Damaged yes... fix yes,, well hopefully,, ok frstly it seems you blew an output IC or a filter.. now i dont have a diagram and basically one isnt needed,, you will need some screw drivers, a soldering iron and some solder..and a multimeter if you have one..

  1. open up the unt (unplug it first)
  2. look at where the speaker's connect you will notice it leads to 4 - 8 huge IC's on heat sinks.. close to the heat sinks are a few capacitors (filters) look at them and pray you find one with an oily surface.. If so remove it by soldering it, take it to the shop and get a new one to solder in place.. and then test the system to make sure it works..
  3. IF not a filter then plug in and turn on the unit.. touch every one of the 4 -8 ic's to see which get HOT!!!!!! very hot,, that one is blown (actually will be more than one) again unsolder them,, get replacements and reassemble..
  4. turn on and enjoy!!..


Posted on Sep 17, 2010

  • Rishi Roshan Ali Sep 17, 2010

    yeah sure its easy just follow the above steps,, no need to check the voltages on the IC's since the bad ones get hot quiclky,, a mere touch will do,, just be sure to take all necessary precautions against electrical shock,, nah it wont kill you (will hurt a horrid bit) and might damage the unit further.. So just be careful wile doing it.. Also look at the diodes and resistors connecting the filters to make sure none aint burnt ..

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I do know that they have a high frequency input and a full range input on each speaker.

I am going to guess that maybe you have them connected to the high frequency input.

Are you using 1/4 inch jacks connecting to the input of the speakers?

I don't remember these speakers having a input for wires.

You may have another issue using these speakers with that reciever.

The JBL speakers are 4 ohms each, it is very likely that the onkyo requires 8 ohm speakers.

Look on the back of the Onkyo where the speaker jacks are at and see if it says anything about the minimum impeadance.

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Let me know if this helps you or if you need more help.

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