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Yamaha receiver sudden death

Discussion in 'Electronic Repair' started by JM, Aug 9, 2003.

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  1. JM

    JM Guest

    I have a Yamaha RX-350 receiver that suddenly stopped working and produces
    no output, either through headphones or the speakers. If I turn the volume
    up all the way, I can barely make out the input source in the phones.
    Anyone run into this before or have any ideas what a novice multimeter
    warrior such as myself might be able to check before getting someone else to
    look at it? I've already determined I"m not doing somethings silly like
    using the wrong input or having the tape monitor turned on, if that helps!
     
  2. [This followup was posted to sci.electronics.repair and a copy was sent to
    the cited author.]

    Have you disconnected EVERYTHING from the receiver? Maybe a cable or
    speaker wire is shorting out? Look carefully for any wire hairs on the
    speaker wiring posts. You can then try the headphones (are you certain
    they are good?) with the tuner. It might help to unplug the receiver for a
    few hours, just in case something needs to reset.
     
  3. JM

    JM Guest

    Nope, tried all that, the phones are good, and everything is unplugged. One
    thing I noticed is that it doesn't click when I turn it on any more -- at
    first I wasn't sure if it ever did, but after searching Usenet a bit I read
    that it should. Could it be that the relay is just stuck in the "off"
    position, or is there something preventing it from clicking over into output
    mode?
     
  4. JM

    JM Guest

    Turns out that's exactly the problem... after desoldering and removing the
    output relay, and taking it apart, the coil has actually been broken
    somehow... but by physically moving the contacts I got my sound back, so
    that must be the problem. I suppose it's possible I severed the coil while
    opening the relay, but I was careful while doing it... if I did do that then
    the problem must be in the circuit that throws the relay... I guess a tad
    more investigation is in order before I go looking for a new part.
     
  5. JM

    JM Guest

    Ok, so after some further testing, it looks like the coil isn't receiving
    the 24 volts it needs to throw over to the on position... When I test
    between the two sides of the coil, I only get about 3 volts. The odd thing
    is, if I test between ground and one side of the coil, I get -40 volts (ie
    that side of the coil is below ground). If I test between the other side of
    the coil and ground, I get nearly 0 volts.. So I'm a bit confused as to why
    I wouldn't then see about -40 between the two sides of the coil.. which
    should be more than enough to actuate the coil, I would think.. Any ideas?
    This probably all makes perfect sense to a lot of you, but as a novice
    tinkerer, I'm stumped :)

    Thanks in advance...


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  6. Sofie

    Sofie Guest

    JM:
    I am a little confused here..... WAS the relay was good or bad BEFORE you
    removed it?
    Is the protection circuitry providing energizing voltage to the relay?....
    or is there DC on the speaker rails thus preventing the relay from being
    energized??
    I certainly would NOT have a good set of speakers hooked up to the receiver
    while you forcibly physically close the relay contacts.... I would suggest
    that you should get the proper replacement part installed right away and
    continue with your troubleshooting if further repair is required.
     
  7. Geo

    Geo Guest

    This looks like you are using a meter without the relay coil in circuit.
    In your first measurement the meter is forming part of the circuit instead of
    the coil.

    Geo
     
  8. Sofie

    Sofie Guest

    JM:
    ..... as long is there is enough CURRENT.... try another relay.
    --
    Best Regards,
    Daniel Sofie
    Electronics Supply & Repair
    --------------------------------------

    snipped:
    ideas?
     
  9. JM

    JM Guest

    Ok, I checked the speaker outs, no DC voltage on either channel, so that's
    cool. I'm going to try and get a replacement relay and go from there.. The
    particular relay (Omron G5R-2232P) is discontinued from what I can tell so
    I'm not sure where to look for a replacement.. I emailed Omron themselves to
    see if there is a drop-in replacement directly from them.

    Thanks for all the replies so far :)
     
  10. You might still be able to get the relay from Yamaha.

    Mark Z.
     
  11. Wdyorchid

    Wdyorchid Guest

    You didn't mentioned if you measured the speaker outputs with the relay
    bypassed as someone previously mentioned. I have about the same as you do I
    unable to solve it. The problem that won't energize the relay due to a blown
    amp. Have you tested your relay outside? It's sounds almost weird to get -40 by
    studying this schematic at this webpage. If anyone beleives differently, let me
    know how or why. Here take a look.

    http://autotails.tripod.com/yamaha.htm

    -
     
  12. JM

    JM Guest

    A quick followup: I took the relay to a local electronics parts shop, and
    the guy there was able to quickly find a replacement Omron relay for the
    G5R -- he gave me a G2R-2 relay which seems to be the same aside from being
    dual pole instead of single as in the original. The receiver works fine now
    with the new part installed.
     
  13. jakdedert

    jakdedert Guest

    Thanks for the followup. Your experience may help someone else with a
    similar problem

    jak
     
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