Question about Marantz SR-18EX Receiver

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Marantz SR-18EX; Front left channel crackles

My 6 year-old receiver is making crackling/static/buzzy noises from the front left channel. I've double-checked all the connections. It does it regardless of the source; TV, radio, CD, DVD. I've switch speaker wires, so I know it's not the speaker (wish it was).

I'm wondering if this is common to this receiver, and if there's a repair that is the usual culprit, rather than spending tons of time and money tracking down the problem.

Also, are there any recommended service shops?

Thank you!
Peter in Milwaukee

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  • peter4jc Apr 20, 2009

    Thanks Guru dristi,

    I used banana plugs when I first wired things up 6 years ago, and it actually started acting up intermittently about a year ago. A couple months back, I asked a neighbor for advice. He's been into electronics all his life, and installs high-end systems mainly for church sanctuaries. So when he came over and listened to it, he suggested removing the banana plugs in favor of a direct connection. That seemed to get rid of the problem. I'm ashamed to admit that I didn't know there were different sized banana plugs, and a couple of them were small and sloppy in the terminal. So I was happy as can be that I was out of the woods. But now it's the same thing all over again.

    My connections all look good. I took off and put back on a few that looked iffy, but the problem persists. I use a piano sonata CD as my test, since it's easiest to pick out the fuzziness in my tweeter and midrange with a solo piano.

    I'm curious enough and brave enough to pull the case off the unit, just to look around. But I don't actually know what I'm looking for. Would a failed solder connection be visible or obvious? My neighbor mentioned that at a certain age, electronics have solder that is easy to do, but he doesn't have the equipment to do the newer type. He mentioned that there could be a ton of capacitors and no way to check each one without replacing them, which would be time-consuming and expensive.

    But I'm open to any and all assistance you can offer. And I'm extremely grateful for your time and wisdom.


  • Anonymous Apr 30, 2009

    I have the same problem, the front left channel crackles on speaker and headphones

  • peter4jc May 28, 2009


    Thanks for the detailed post!

    Would your recommendations still hold true if my problem is sporadic? It hasn't acted up now for a couple weeks, even if it's on for hours. Other times it'll act up more quickly. It is always only the FL channel.

    Also, I am not capable of doing the repair/soldering. Are there any shops that you suggest? I don't know Fixya's policies, but can I ask for contact information here w/o causing problems? I can be contacted at



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The f-l channel of the sr18, & sr18ex & sr19 is a common failure location due to the heating and cooling over the years. The crackling an/or distortion, is most commonly due to the amplifier going into a high idle, or d.c. offset that can no longer be controlled by the adjustment potentiometers on the board. usually the two 2sc3200 transistors become unstable, and as well a 47mfd and a 470 mfd elect. caps nearby. Also distortion is caused by one or more of the zener and germanium diodes all grouped near the big dual ceramic white resistor. The amp block is held in by six screws. first remove the cross bracket, then cut the cable tie free from the hole on the board. Ten screws hold the top board on, the pull the boards apart from the connectors. before replacing it, resolder ALL of the connector pins to BOTH boards.

Posted on May 27, 2009

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Dear Peter,
From the problems listed by you, I think there is some leakage on the power board.

But before we do further trouble shooting, please do check your speaker cabling again. Make sure that all of them are seated properly, none is touching each other or the body of receiver. Take out all the wire and put them back again if necessary..
Are you using banana plugs for connecting speaker or just directly. Some times even a little tiny frayed wire touching the receiver could trigger the protect mode or have that cracking noise. Be careful, since protect mode is sometimes not fast enough and it could blown a few trasistors in the power circuit.

If everything else seems all right and still your receiver is making the static noise then it possible that there are bad connections on the main board that are set in. This would generally happen if the system is slighly old or have dry solder. This should be a simple repair that may not require parts or maybe just the change of some capacitors.

If you can solder, you will be able to repair this yourself, I could guide you further. If not, then a local service center will change the local labor rate. Let me know if I can guide you further.
Best of luck! Thanks for using FixYa!

Posted on Apr 20, 2009

  • Sachin
    Sachin Apr 21, 2009

    Dear Peter,

    I suggest if you are not confident about soldering, then it best left alone, since you could do more damage than repair your self. But, If you friend is confident then :

    Generally, there are poor solder connections somewhere on the main board. Usually these are at the voltage regulators where there can be some heat. Look for 3-legged transistors attached metal heatsinks, If you can solder, resolder the pins on those parts. Also look for any connections that appear to be grasiny or have rings and resolder them too.

    Let me know if it help....we can then trouble shoot it further..

    Best of luck...



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