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Faulty Relay Inside Amp?
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<blockquote data-quote="thylantyr" data-source="post: 819930" data-attributes="member: 560358"><p>Look at this schematic.</p><p></p><p>Figure 2.</p><p></p><p><a href="http://sound.westhost.com/project89.htm" target="_blank">http://sound.westhost.com/project89.htm</a></p><p></p><p>This is a generic idea on how a switch mode power supply works.</p><p></p><p>J2 is the remote wire input. It drives a transistor called Q5 and in turn</p><p></p><p>drives a relay to turn on the power supply. Not all power supply designs</p><p></p><p>use a relay on the turn on circuit, but the point I want to make is if that</p><p></p><p>little transistor is bad it may be shorted causing it to be 'on' all the time.</p><p></p><p>If you want to dig deep into your amplifier all you have to do is trace</p><p></p><p>the remote wire on the printed circuit board and find the transistor</p><p></p><p>or circuit that it connects to and debug from there.</p></blockquote><p></p>
[QUOTE="thylantyr, post: 819930, member: 560358"] Look at this schematic. Figure 2. [URL="http://sound.westhost.com/project89.htm"]http://sound.westhost.com/project89.htm[/URL] This is a generic idea on how a switch mode power supply works. J2 is the remote wire input. It drives a transistor called Q5 and in turn drives a relay to turn on the power supply. Not all power supply designs use a relay on the turn on circuit, but the point I want to make is if that little transistor is bad it may be shorted causing it to be 'on' all the time. If you want to dig deep into your amplifier all you have to do is trace the remote wire on the printed circuit board and find the transistor or circuit that it connects to and debug from there. [/QUOTE]
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Faulty Relay Inside Amp?
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