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The Basement
Biamp Advantage 7/250 Mixer/Amp Repair
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<blockquote data-quote="John Roberts" data-source="post: 15916" data-attributes="member: 126"><p>Re: Biamp Advantage 7/250 Mixer/Amp Repair</p><p></p><p>I suspect r23 is the least of your problems. </p><p></p><p></p><p></p><p>That R is across the power amp pre drivers, and if it is burned up, that means some serious failures have occurred. </p><p></p><p></p><p></p><p>I would start by checking all of the output stage power transistors and everything in the general area. </p><p></p><p></p><p></p><p> If you have a VOM with a diode scale you can check for base emitter junctions and a similar diode base collector. Also check for open collector-emitter. I suspect you will find one or several power devices with a shorted collector to emitter. </p><p></p><p></p><p></p><p>This will not be a simple repair. but perhaps a learning experience if you have some basic test equipment, patience, and perhaps a pile of replacement parts. </p><p></p><p></p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 15916, member: 126"] Re: Biamp Advantage 7/250 Mixer/Amp Repair I suspect r23 is the least of your problems. That R is across the power amp pre drivers, and if it is burned up, that means some serious failures have occurred. I would start by checking all of the output stage power transistors and everything in the general area. If you have a VOM with a diode scale you can check for base emitter junctions and a similar diode base collector. Also check for open collector-emitter. I suspect you will find one or several power devices with a shorted collector to emitter. This will not be a simple repair. but perhaps a learning experience if you have some basic test equipment, patience, and perhaps a pile of replacement parts. JR [/QUOTE]
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