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Echostar sr8700 power supply schematic
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<blockquote data-quote="jeallen01" data-source="post: 1088322" data-attributes="member: 176704"><p>The more I think about this, the more I am inclined to guess that the fault <em>is </em>somewhere around the group of components I mentioned in post #12 - and specifically the CR8 (which is reverse-biased for 1/2 of of the drive cycle to SM1) because, if that has gone s/c then the high voltage DC rail will be pulled down by the voltage divider formed by R18 and Q2, and the circuit won't be able to "flip-flop" to provide the HV drive square-wave to SM1.</p></blockquote><p></p>
[QUOTE="jeallen01, post: 1088322, member: 176704"] The more I think about this, the more I am inclined to guess that the fault [I]is [/I]somewhere around the group of components I mentioned in post #12 - and specifically the CR8 (which is reverse-biased for 1/2 of of the drive cycle to SM1) because, if that has gone s/c then the high voltage DC rail will be pulled down by the voltage divider formed by R18 and Q2, and the circuit won't be able to "flip-flop" to provide the HV drive square-wave to SM1. [/QUOTE]
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Echostar sr8700 power supply schematic
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