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QSC Powerlight 3.4 troubleshooting
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<blockquote data-quote="Michael John" data-source="post: 124171" data-attributes="member: 830"><p>Re: QSC Powerlight 3.4 troubleshooting</p><p></p><p>Hi Franz,</p><p></p><p>So is the +- 15V ok just after the half have rectifier? If so then it could be that the series diode - D738 (1N4004) - is dead. It's also worth checking the other series diode D741 (1N4148) and their series resistors R748 and R747. There are so few components in this part of the supply, it should be fairly quick to check them all, even if you have to unsolder the odd leg or two to isolate a component.</p><p></p><p>Cheers,</p><p>Michael</p></blockquote><p></p>
[QUOTE="Michael John, post: 124171, member: 830"] Re: QSC Powerlight 3.4 troubleshooting Hi Franz, So is the +- 15V ok just after the half have rectifier? If so then it could be that the series diode - D738 (1N4004) - is dead. It's also worth checking the other series diode D741 (1N4148) and their series resistors R748 and R747. There are so few components in this part of the supply, it should be fairly quick to check them all, even if you have to unsolder the odd leg or two to isolate a component. Cheers, Michael [/QUOTE]
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