Shenzhou ST-9900 Type Satellite Receiver Switch Power Repairing Circuit

Published:2011/8/5 0:14:00 Author:Robert | Keyword: Shenzhou, Satellite, Receiver, Switch, Power, Repairing | From:SeekIC

Fault 1: Starting without any indication on receiver's panel.The faults analysis and processing. Openning the case, according to the experiences it is firstly to test the power's filter capacitor's two ports (47uF/450V). And there is no voltage indication. It means the power are working without rectifier. Using the multimeter resistance stage to test the current-limiting resistor (6R2/5W), the result is infinity. By analysis, the reason caused the current-limiting resistor damaged is just that the filter capacitor, power regulator tube and other elements are broken. Testing the filter capacitor (47uF/450V), it is found that its upside part has been bulging. Then removing this capacitor to test, it is found to have breakdown. Replacing the filter capacitor and the current-limiting resistor, the receiver panel has the normal indication and the fault is soved.



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