Question about Marantz SR-18EX Receiver
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!
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
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
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
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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