Question about Russound CA64IL Amplifier

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I have no output on my Russound ca6.4. All lights on console and room controllers appear to function. Input double checked. Could amp be fried?

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  • schriger
    schriger Dec 25, 2012

    Marek, I have a similar problem and read this post. There is about 1.3 V across this capacitor. Is that enough to be "any AC?" The unit was fine, then became intermittent on all channels and now never plays. Thanks David

  • schriger
    schriger Dec 30, 2012

    I just changed the capacitor as Marek suggested (I used the original type because I did not hae a 4.7 uF one and I am up and running. Fantastic advice. Thanks Marek.

  • Larry Ruehl Jan 31, 2013

    Is the Cap C28 label hidden? I see a cap matching Marek spec but it is between IC10 and C29. The label is either hidden or not marked. Also, anyone try with the 4.7uF?

  • Larry Ruehl Feb 10, 2013

    Marek, Your a Genius! I replaced the C28 with the 4.7uf from radio shack which cost me less than $2. Voila, it now works and my house is back to rockin! For those interested, The C28 was sandwiched between the IC10 & C29 on the bottom board about 2" away (inward) from the board power connector. But then I have the newer 6.4 with the plug in keypad connectors and it may be different if you have the scewdown type.) Several screws of different sizes have to be removed to get to it and be sure to take note of which ones came out where cus I now have leftover screws:( Okay, off to my regular duties now. Good luck to all and thanks!

  • Jean sullivan Aug 11, 2013

    I may have same problem, but not sure about where the c28 is located on unit. Do you have a pix? Or description of how to access cap?

  • Mark Kisin
    Mark Kisin Nov 07, 2013

    I have the same symptoms with the same unit. I couldn't find the C28 although it looks like there might be a leaking capacitor around the area described by Larry. Is this the problem ?



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CA6.4 that has no sound, but all other funtcions are fine, has a problem with protection IC 10 (uPC12370). Check the Cap C28 (2.2uF/50V). If you read any AC
Volatge on that Cap, it means Cap is dry. Replace it with 4.7uF/50V and go back to
your regular duties.
P.S. Since the unit is discontinued, I would love to see basic diagram, available from the manufacturer for download, for easy troubleshooting. I had to spend feew precious minutes to fix that.

Posted on Feb 25, 2012

  • 4 more comments 
  • isaac galandauer Nov 25, 2012

    Is there any way you can specify where in the unit to find the part you are describing above?

  • schriger
    schriger Dec 25, 2012

    there are two large circuit boards. This capacitor in on the lower one. about two inches in from the main connector to the power supply circuit board.

  • schriger
    schriger Dec 25, 2012

    marek, I have the same problem as philip posted in May 2011. There is 1.3 V coming across Cap C26. Is that enough to pass your "any AC voltage test?"

  • schriger
    schriger Dec 25, 2012

    also Marek, why replace it with the larger capacitor rather than one that meets the original spec?

  • Philip Gregory Dec 30, 2012

    You guys are bliilliant

  • Anthony Pen
    Anthony Pen Oct 03, 2017

    hi i have the same problem but my cap R42 is burn but i dont know how many ohm is it can you help thanks



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What letters / numbers that appears on the screen?
If the display is normal, and you can switch to other banks, and can edit each bank, then the problem of no sound, is at the pre-amp IC input, output amp, or CODEC converter.
This is the overall image of G1X inside.zoom-g1x-theres-no-sound-all-power-2ss5ycyvkoajtv035dpuezke-2-0.jpg Next, we zoom-in the middle of picture above.
See the next picture.
IC2 (left) is input pre-amp IC (NJM2100).
IC4 (middle) is the CODEC IC (WM8734).
IC5 (right) is the IC output (NJU7082).zoom-g1x-theres-no-sound-all-power-2ss5ycyvkoajtv035dpuezke-2-1.jpg

Test whether the input IC is working normally, turn ON G1X, plug the guitar, go to BYPASS/TUNER menu. When the TUNER function could work, certainly input IC is not damaged.
Means only two possibilities, namely CODEC and output IC. That is not easily tested, except in specific ways.

May also, there are problems in the input / output socket.
Turn ON G1X. Try the following (see figure below):
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If lcd light are on (as you say), but appearing G1 or d5 or bt, and the system are hang / frozen, this is a different issue to the one described above,and dealt with in different ways too.

References IC datasheet:


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