Question about DOD SR231QXLR Home Equalizer

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Very bad hum one is 60hz second is a loud buss would like the sch

DOD 231 60hz hum and loud buzz I would like the sch then I can scope the signal path this unit is used in a broadcast studio

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Hi.
I have a similar one of these, and am having some issues with it. I have previously repaired the power supply section which is on the back of the unit screwed to to the left of the I/O section (when looking from the front). The capacitors weren't too crash hot so I replaced them, though I am having an ongoing problem so was hoping you might be able to help me if you've learnt anything about the unit.
I'm getting a very low signal, ie: I can just hear the sound when the amp is maxed up. I noticed when I ran the system with the ground of the amp lead I got a good signal???
Anyway, cheers.
Robert.
dronno@live.com

Posted on Apr 02, 2011

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Posted on Jan 02, 2017

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I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

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I have kenwood amp m-a100 which has loud buzz / hum on all channels and distorts radio very badly can you help ?


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If you turn the unit on with no input and get a loud buzz, and when you put signal to it and you cannot hear the music but the buzz (Probably more like a hum). Then most likely the amp is blown.

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Sound cuts out


Hi Darren.
I suspect you may be right about the eq here, though you probably have had it sorted by now.
I came across this thread because I was searching for a fix to my R-231 and was hoping you might be able to help me if you found a fix. I'm persisting with this one as I can't really get another just now and it seems that it's not a major issue. I managed to get a good signal out of it when I ran it without the ground connected on output???
Anyway, any info I would greatly appreciate,
Thanks, Rob dronno@live.com.

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1 Answer

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i had the same problem once and in my case i had accidentally used ground wire for signal. pls check ur connections again. one check u can do is set the high pass filter to 70Hz and see if that cuts out the low hum.

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I recently bought the below record player; http://www.robertopiecollection.com/Application/Products/steepletone/record-players-GB.asp thinking buying a brand new player would mean having no problems with...


Sounds like a bad ground loop or open shield to the signal path, or feedback from its own speaker or motor. The output of the stylus is so tiny that any electromagnetic noise can easily loom large if it leaks into the signal path.

Be advised that turntables and speakers should never coexist on the same platform or speaker vibration will feed back into the stylus, get amplified again and eventually overdrive the electronics and maybe blow the speaker, which begs the question - how did they get away with it back then? One answer is that there was never any real bass from one of these things.

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Have seen this many times.

Sounds like a bad CAP since a bad diode would blow the fuse and a bad mag would likely do the same thing.

Since yours is making the loud 60hz buzz you need to replace the capacator that will likely fix the problem. A $10 fix

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