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Echostar sr8700 power supply schematic
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<blockquote data-quote="jeallen01" data-source="post: 1088316" data-attributes="member: 176704"><p>That link mentions R18/19 failures but failures in any of the components around/including CR4/5/6/8 & Q9/Q2 might cause a similar issue.because that would stop the switching voltage being applied to the transformer SM1</p><p></p><p>Edited: just had another thought: the level of the rectified DC across the big primary-side smoothing cap should much nearer to 350-400V DC than 240V, so something seems to be pulling that rail down to below what the switching cct needs to drive SM1<em> - or am I misinterpreting what [USER=415123]@harm lok[/USER] wrote in post #6?</em></p></blockquote><p></p>
[QUOTE="jeallen01, post: 1088316, member: 176704"] That link mentions R18/19 failures but failures in any of the components around/including CR4/5/6/8 & Q9/Q2 might cause a similar issue.because that would stop the switching voltage being applied to the transformer SM1 Edited: just had another thought: the level of the rectified DC across the big primary-side smoothing cap should much nearer to 350-400V DC than 240V, so something seems to be pulling that rail down to below what the switching cct needs to drive SM1[I] - or am I misinterpreting what [USER=415123]@harm lok[/USER] wrote in post #6?[/I] [/QUOTE]
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Echostar sr8700 power supply schematic
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