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Marantz 2230 and not being able to leave well-enough alone!

Landcruiser

Landcruiser

New Member
Hi everyone,

I'm new here and recently posted this is the Solid State forum before realizing Marantz had its own forum...here goes!

I recently picked up a minty fresh, *all original* Marantz 2230 from my local Craigslist of all places. I got her home and cranked her up..sounded great aside from a scratchy volume pot. So I figure I'll open it up, clean out the years and years of dust and de-ox all the necessary pots, switches, inputs, etc..

While I had it opened up, I figured I should check the power supply and amplifier bias #'s. I get the power supply to the 35.6VDC number recommended..no problem. I move to one amp, it's running a little high..so I back it down to the recommended 5mV..no problem. I get over to the other amp and it was also running a bit high. So, I ask my wife to give me a hand this time and dial it back for me while I check the resistor and count her down to 5mV. I get to 5.2mV (I should have stopped!) and tell her just to give me a little more.. When she does, my meter goes to 0. And it NEVER came back. I'm assuming I touched something I shouldn't have during the adjustment and ended frying something..but what? No smoke, no smells.. R774 was still resisting (1.5k I think).. But nothing was coming through. I plugged it back into my speakers just to confirm and sure enough, the right channel was full of weak static with only subtle hints of music coming through. Any ideas what I fried?

I had planned on ordering a recap kit anyway..but now I'm wondering.. Will the recap kit fix the (possibly) fried amp?

Thanks for reading, I appreciate the time!

Danny
 
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Hi Danny, and welcome AK.

Recapping is more of a preventative maintenance as opposed to a problem solver. Of course sometimes bad caps can be resolved with a recap but that is not the norm.

It is possible the trimmer you were adjusting is not tracking well. Many restorers will replace the trimmers with nice new multiturn trimmers that are easier to dial in. If the trimmer opened it is also possible a transistor shorted.

The 2230 is cap coupled so a recap would be a good idea but you also need to resolve the issue at hand. I'd examine the schematic and take some voltages off the circuit. Compare to the working side as well.
 
Mike,

Thanks for the suggestions! I'll need to do a little more homework on the subject before getting back in there, but I should have plenty of time troubleshoot it over the weekend. I'll start with the trimmer and move on accordingly. Thanks again!
 
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