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The Basement
Biamp Advantage 7/250 Mixer/Amp Repair
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<blockquote data-quote="Jeffrey Knorr" data-source="post: 244" data-attributes="member: 29"><p>I have a background in Electronics but don't have extensive experience in bench repair. One of my Church clients asked me to check out a problem they're experiencing with a Biamp Advantage 7/250 Mixer/Amplifier. The unit is generating ~24 VDC on the 4Ohm speaker outputs along with a hum. I opened the unit up, and it appears as if at least R23 on the PCB has been cooked. Measuring across R23, I see ~ 27 VDC.</p><p></p><p></p><p></p><p>The schematics for this unit can be downloaded here, <a href="http://www.biamp.com/downloads/download_redirect.aspx?ID=217" target="_blank">http://www.biamp.com/downloads/download_redirect.aspx?ID=217</a> and are shown on <strong>Page 4</strong>.</p><p></p><p></p><p></p><p>I'm capable of replacing the blown resistor but I'm not sure what may have caused the blown resistor or if that's the only problem with the unit. Has anyone seen similar symptoms and have any pointers for me?</p><p></p><p></p><p></p><p>Thank you,</p><p></p><p></p><p></p><p>Jeff</p><p></p><p></p><p></p><p>P.S. Kudos to Biamp for providing the support docs on their products!</p></blockquote><p></p>
[QUOTE="Jeffrey Knorr, post: 244, member: 29"] I have a background in Electronics but don't have extensive experience in bench repair. One of my Church clients asked me to check out a problem they're experiencing with a Biamp Advantage 7/250 Mixer/Amplifier. The unit is generating ~24 VDC on the 4Ohm speaker outputs along with a hum. I opened the unit up, and it appears as if at least R23 on the PCB has been cooked. Measuring across R23, I see ~ 27 VDC. The schematics for this unit can be downloaded here, [url="http://www.biamp.com/downloads/download_redirect.aspx?ID=217"]http://www.biamp.com/downloads/download_redirect.aspx?ID=217[/url] and are shown on [b]Page 4[/b]. I'm capable of replacing the blown resistor but I'm not sure what may have caused the blown resistor or if that's the only problem with the unit. Has anyone seen similar symptoms and have any pointers for me? Thank you, Jeff P.S. Kudos to Biamp for providing the support docs on their products! [/QUOTE]
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