Question about Yamaha RX-V395 Receiver

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Rx-v800 You posted a reply about a memory capacitor leaking on one of the boards and identified the board as a standup board. Could you help me out with a better descriptiion of just where these caps are? this problem was on an rx-v800.

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  • trbodden Apr 01, 2008

    There is no fluid in that area. The cap I see is C646. It is the only cap with a retainer clip on it. It is next to C631 and is unusually flat compared to others on board. Is there a way to disable the protection circuit until I can get a repair manual (best source?) and look into this further.

  • trbodden Apr 02, 2008

    Don't see anything. Can't ID C633. But here is some add'l info. After leaving this system alone for a while ( more than minutes) it will come back on and stay on if I don't do anything. I can do some things (change the effeect) and it will stay on; but the minute I try to change the input, off it goes and the wait starts again.

    PS does vancebaldwin have manuals?

  • trbodden Apr 02, 2008

    Bobby , I apreciate your help on this. I found the C633 inscription. It was on the front side of the board. Will the system work if it is removed?

  • trbodden Apr 02, 2008

    I have downloaded manual. In the beginning they talk about the remote control key code. Is this the remote that comes with the unit? If so, is there a table or instruction explaining how to generate the codes? In the very beginning there is a way to disable all protection with the exception of overcurrent. I would like to try this, as working on the board would try my soldering skills at htis stage of the game (age). If all else fails, I will try or it or seek professional help. Maybe send the board to you guys,eh? thank you again for your patience, I reallly do appreciate.

  • trbodden Apr 02, 2008

    OK, it is out (had to break leads).

    what kind of tools needed for this? vacuum pump? solder ******? Will 91% isopropyl alcohol do as a cleaning agent? any advice will help.

  • trbodden Apr 02, 2008

    OK BobbyJ!!! My skepticism is dead...Removed cap, cleaned area and can now change inputs without problems. You're experience here was invaluable. Couldn't see anything wrong until cap was removed and light was shed on the area at the right angle. IL guess I'll order the part but only after I see if I can live without it. Or I may put it in from the backside, where it won't cause a problem if it goes wrong. thanks again




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The capacitor is on the board that is on it's side (standing up as opposed to laying flat) it is the longest board it also has most of the input jacks housed on it. the supper capacitor is on the top side middle area and it looks like a button and is either blue or black. it is a .047F 5.5 volt super cap located at C633 part number WD294400 get it at .

Posted on Apr 01, 2008

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  • Robert Johnson Apr 01, 2008

    the electrolitic fluid is hard to see, you need magnifiers to see the corrosion this shorts the micro. you need to clean this up good. you can remove the cap and clean the board and leave the cap out, this is a memory cap used to keep the user settings when the power goes out. clean the area with contact cleaner and stiff brissel brush. try to get into those hard to reach places between leads and under components. do not use water or any thing that contains water. C646 is a .1uF 16 volt cap but the cap you are discribing is C633 and that is the cap to remove. it looks like it has a retaining clip but that is the lead. if you look along the side of it you should see the value and voltage written on it.

  • Robert Johnson Apr 02, 2008

    yes the system will work if removed as I stated in the last post, but you must clean the board!!! all this cap is for is the memory of your customer settings if the power sould be lost.

  • Robert Johnson Apr 02, 2008

    the simptom you state is the clasic leaky cap. Ive done a lot of these, infact yamaha has tech posts on this problem and the super cap is the problem.

  • Robert Johnson Apr 02, 2008

    if you find that the shut down is over current because the lines that are affected by the fluid are the sense line to the micro of the over current. that is why when you change inputs it shuts down. (mutes first then un-mutes to the amps then shut down)

  • Robert Johnson Apr 02, 2008

    I'm glad to help



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