Question about Marantz SR-18EX Receiver

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Marantz SR18-no sound

When I turned on the receiver yesterday, there was a loud pop followed by no audio. Something definintely "fried" inside the receiver as I could smell burnt electronics.
The display still works as do controls (visually responsive). It is also still recognizing digital signal in.
I'm wondering what the most likely problem may be so I can evaluate whether to replace the unit or pay for a repair attempt. Someoe already suggested a transformer could be blown which would seem to be straightforward to fix. Thoughts and suggestions appreciated!

Posted by bswitz on

  • 3 more comments 
  • Anonymous Mar 31, 2008

    I have the exact same problem ... i heard a loud popping noise (after the equip was on a short while, my SR 18 is about 8+ years old) and it even power surged my computer in the next room, but then there was no sound right after that, even though there was power and all of the components were working.
    I did not smell a burnt smell however... I would like to know about how much it would cost to replace the transistors, if that is in fact the problem, and where
    to take it (i live in San Diego).... Thank you ..... [email protected]
    March 31, 2008

  • wmann Jun 09, 2008

    Hello, I have a marantz sr-18u in need of repair. It has been down a while, I bought a marantz 7200 as a replacement in order to send it out, buy never did. I now am having problems with the 7200 which I will send out under warrenty, but I would also like to get the sr-18u fixed if possible.

    I am getting no sound out of the unit. I used the tuner and well as a marantz cassette deck to test.

    I have attempted to connect a marantz mm500 amp that I have from when I used an av-500 preamp (which I no longer own) to the preouts and still get no sound. I am not really sure what I am doing, but I removed the jumpers from the mains prein/preout and I connected the amp, and assumed that it would use the external amp without changing any settings, but I am not sure if thats correct. I connected the amp with standard high quality rca cables, is that correct? Could someone suggest a better way to determine the problem?

    As such I am not sure if its an amp problem (which I assumed it was) or something else. Does anyone have an idea what might be wrong and if the mm500 amp should have produced sound? Any suggestions as to the best person to repair this unit and what might the cost be? I am on the east coast so if possible I would prefer to send it as short a distance as possible.

    Bill Mann

  • boypogi Jan 22, 2009

    i have this problem too,i have a marantz reciever model no;SR5200 the power on but sound,i dont no what the problem is,so i bougth a sony 7.1 channel more better than marantz.

  • richardronal May 03, 2009

    i bought the marantz sr 19 , When I turned on the receiver yesterday, there was a loud pop followed by no audio. Something definitely "fried" inside the receiver as Could smell burnt electronics.
    The display still works as do controls (visually responsive). It is also still recognizing digital signal in.
    I'm wondering what the most likely problem may be so I can evaluate whether to replace the unit or pay for a repair attempt. Someone already suggested a transformer could be blown which would seem to be straightforward to fix. Thoughts and suggestions appreciated!

  • Anonymous May 15, 2009

    I have the same problem, no audio at all from any source. It was working fine, but all of a sudden quit working. I also get the "NO DATA" message on the receiver display.By the way, video is fine is only a audio problem.

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5 Answers

Anonymous

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I have worked exclusivly on marantz recievers, for the last seven years, the loud 'pop' you heard, and smoke, was 90% that one of the amplifier channels, on the amp block, has blown, and consiquently the unit stays in protect mode. It will power up, and decode audio, and even show an f.m. stereo on the tuner, but you won't get the 'happy click' of the protection relays, until the channel is repaired. also replace the 5fd memory capacitor on the front micro board behind the front panel. If you have someone repair the channel, make sure that the tech resolders all of the connections on the molex connectors on the amp block. there are 10 of them, five male and five female, The bad solder on these are what caused the problem in the first place.

Posted on May 27, 2009

  • Anonymous May 27, 2009

    The transformers on marantz sr18,19, and ex models, rarely ever fail. I have repaired thousands of amplifiers, and most of them failed because of the poor solder at the molex type connectors on the block. depending on witch connection failed, they can cause the bias, or the b+ or b- to go hi or low on either side of that channel causing catastrophic failure. When replacing obviously burnt out components, keep in mind that some blown parts do not show signs of overheatng, for example, there is a 1watt 220 ohm resistor sitting up high, near the connectors that will look ok, but meters out as open. (one for each channel)

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I have repaired three of these now, and your problem is a common one. You have blown outputs in one of the channels. When the outputs go, they usually take half the components on the driver board with them, which shuts down the protective relays for the entire power amp. The SR-18 has two driver boards, one handles 3 channels, one handles the other two. For some reason, it's usually the 3-channel board (P-704) and associated outputs that goes belly-up. Now, if you've been working on receivers for a few years, and you have some time to spend on this, I'll bet you can fix it yourself. You can get all the parts you're likely to need at Audio Labs of GA for under $30.00, and when you find the bad channel, you'll have four other good channels (at least one good channel on the same board) you can use as a reference in checking part values. Moreover, you can pull the entire power amp assembly out of this receiver without too much trouble - it's a heckuva lot easier to work on than most. Good luck to you!

Posted on Oct 19, 2009

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JeffHuang

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I have similar problem like yours, and found one of the power amp outputs (inside) is too high. I believe the protection circuit has worked and the speakers are non-connected to the outputs. I am still trying to work out how many components has blew.

Posted on Jan 01, 2008

  • JeffHuang Jan 06, 2008

    a few resistors are burned (color changed), the cap of one capacitor has a little bit pop-up, one power transistot on heat sink is burned and its package is broken. Any of you could help me get the circuit diagram?

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Transformers don't usually "pop". I'd bet the amplifier output transistors blew. Either way, it should be repairable for a reasonable amount.

Posted on Nov 29, 2007

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Parts are still available for this receiver from Marantz. Burnt components need to be replaced for sure but be aware that the problem may have originated from a component that failed but does not show it physically. The popping sound must have come from a blown output transistor/s - the SR-18 uses the Sanken 2SA1216 and 2SC2922 complementary devices. At least one of them must have blown but don't change just one - CHANGE BOTH. You can ID components by looking at a good, adjacent channel (it's likely only one channel is bad).

Posted on Feb 02, 2008

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