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QSC Powerlight 3.4 troubleshooting
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<blockquote data-quote="Franz Francis" data-source="post: 124287" data-attributes="member: 551"><p>Re: QSC Powerlight 3.4 troubleshooting</p><p></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">Thanks Michael for the info.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">I was able to repair the power supply. There was an open trace between the transformer A.C supply legs feeding the two half wave rectifier diodes. </span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">My previous troubleshooting was in my friend’s warehouse with his D.M.M which was limited to 20khz and the reason why I was not able to read any A.C.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">Back in my lab my oscilloscope painted a very clear picture.</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p> <span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">The transformer secondary legs measured 115 kHz, 40 volts peak to peak which was not getting to the rectifying diodes (D707 & D705). Thanks</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">Franz</span></span></span></p></blockquote><p></p>
[QUOTE="Franz Francis, post: 124287, member: 551"] Re: QSC Powerlight 3.4 troubleshooting [FONT=Calibri][SIZE=3][COLOR=#000000]Thanks Michael for the info. I was able to repair the power supply. There was an open trace between the transformer A.C supply legs feeding the two half wave rectifier diodes. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]My previous troubleshooting was in my friend’s warehouse with his D.M.M which was limited to 20khz and the reason why I was not able to read any A.C. [/COLOR][/SIZE][/FONT] [SIZE=3][COLOR=#000000][FONT=Calibri]Back in my lab my oscilloscope painted a very clear picture. The transformer secondary legs measured 115 kHz, 40 volts peak to peak which was not getting to the rectifying diodes (D707 & D705). Thanks Franz[/FONT][/COLOR][/SIZE] [/QUOTE]
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