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Echostar sr8700 power supply schematic
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<blockquote data-quote="jeallen01" data-source="post: 1088451" data-attributes="member: 176704"><p>So, CR6 partially broke down (probably age + an over-voltage mains spike) and went partial short-circuit, and the resulting high current caused the resistor to overheat and then to partially internally breakdown, thus lowering the resistance?</p><p></p><p>Based on that scenario, I would suggest replacing as many of the components as possible in the group I mentioned earlier because they could be suffering similar degradation even if they haven't already failed.</p><p></p><p>PS: I hope that the above has not damaged the windings of transformer SM1, because that would probably be the "end of" that PSU board and thus likely the whole receiver - but whether that has actually happened or not will only become clear when the faulty (and the "may be faulty") components have been replaced and the receiver is connected to the mains supply.</p></blockquote><p></p>
[QUOTE="jeallen01, post: 1088451, member: 176704"] So, CR6 partially broke down (probably age + an over-voltage mains spike) and went partial short-circuit, and the resulting high current caused the resistor to overheat and then to partially internally breakdown, thus lowering the resistance? Based on that scenario, I would suggest replacing as many of the components as possible in the group I mentioned earlier because they could be suffering similar degradation even if they haven't already failed. PS: I hope that the above has not damaged the windings of transformer SM1, because that would probably be the "end of" that PSU board and thus likely the whole receiver - but whether that has actually happened or not will only become clear when the faulty (and the "may be faulty") components have been replaced and the receiver is connected to the mains supply. [/QUOTE]
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Echostar sr8700 power supply schematic
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