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Marantz 4240 receiver

The left channel on main front speakers isn't working. Is the op amp likely to have gone.

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It could be the op amp, however there are other possibilities like:

- a bad speaker or a speaker cable (try some swapping, see if the left channel is still dead)

- a bad / damaged speaker connector or a bad solder contact on that same connector inside the unit

- a dirty / oxydized connector pin or a bad pin solder contact on any of the connectors inside the unit

- if the main volume pot is actually made of several pots stacked onto a common axis (unlike the standard stereo pots it will have more than six pins), see if any of the pins are poorly soldered and resolder if necessary, if it has a connector also check that for dirty contacts

These are just some of the possibilities so don't take anything for granted.

Hope you can find out what it is.

regards

3rq8 (Triarcuate)

Posted on Aug 03, 2009

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I just bought a 4240 and was upset for a half an hour until fearing my left channel was gone, only to discover the little Radio Shack bookshelve speakers from the eighties that sound awesome now has a bad speaker jack! Grabbed another speaker wire and another set of speakers and the sound is truly amazing. Once again the "Keep it simple stupid" slogan applies here. What a relief!

Posted on May 28, 2010

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In an answer to to your "quest.... Is there a fuse for speaker output"


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but there is a relay in between the main amp output

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In your statements : " Inputs all good ",


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• connect outputs to a separate amplifier



the answer will determine

your "quest ...is this most likely a bigger issue??? ? "


I almost forgot to ask what channel are you referring to?


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http://www.retrevo.com/support/Marantz-SR8200-Receivers-manual/id/511ci775/t/2/

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http://community.klipsch.com/forums/storage/74/1341919/200w%20mono%2005.jpg

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There's good news and bad news. The bad news you need a separate amp because a multichannel receiver with Bose 901's attached as recommended for a standard stereo receiver will only sound right in STEREO on stereo analog material. The other speakers around the room are not designed to receive its Active Equalization and if you engage your Tape Monitor you will NOT BE ABLE TO HEAR DIGITAL sources at all. Tape Monitor is for analog stereo material only and on modern AV receivers it disables any digital inputs so you really can't use the Tape Monitor circuit or attached devices for modern digital sources. However, you can still employ the various DSP options to spread 2-channel analog source material around the room. I do.

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* I can't find your exact manual so I have to extrapolate features.

I see on the SR>6003< there are Pre Audio OUTS so I'm betting your receiver does, too.

A separate stereo amp for the 901's was my solution. I run a Carver AV-406 (5-channel amp) for my 901's in Front, 2 Subwoofers and the Rear Surround channel, with the Active EQ between the receiver Front L&R Outputs and the 901's amp channels. My receiver controls everything and just drives the Center and Surround speakers.

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** Front Pre Out; (or VCR or Tape Out if you don't have Pre Outs) >>> Bose EQ Amplifer IN, then
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