Question about DBX 2231 Home Equalizer

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One channel ceased to work. Found transformer to be bad and replaced it. Turned unit on and the top circuit board at front off unit was getting hot and a burnt odor appeared immediately. Found a capacitor blackened and also found U15 chip some discrepancies from other I.C's of same kind when checked with a tracker device. No schematic available . What is U15 (JRC-45600). Any information would be greatly appreciated

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The part is a 4560 (generic opamp IC. The damaged IC is more likely to be the symptom not the cause Remove the IC and the cap. Replace the cap, but not the IC and measure pins 4 and 8 to ground. These should be the power inputs and measure +/- 5 thru 12 volts. They should be equal but opposite. Should htey be different, check the power supplies or any filter caps.

Update this with the results.

Thanks,
Dan

Posted on Apr 07, 2011

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