According to the fault phenomena, estimates the power circuit element thermal performance becomes poor. When failure occurs when the measured power supply output plug-in, the results are no voltage, switching power supply stops working. Measurement of thick film integrated circuit IC1011 {2}, {1} foot voltage, and 0 V, 300 V, respectively, switching power supply is normal work, normal voltage 280 V and 0.24 V respectively, so stop switch regulated power supply. Check the start-up circuit element, such as, good voltage measuring IC1011 each foot, found that when a failure {6} feet voltage is 2 V, when the normal should be 0.5 V, so stop vibration is due to IC1011 {6} feet caused by the voltage is too high. Analysis IC1011 {6} feet voltage related to 17 V power supply circuit, if bad or C1031 D1031 leakage will make 17 V voltage by R1031, D1031 or C1031 added to IC1011 {6} feet, this will cause the internal circuit voltage on C1 {6} foot rise to 0.75 V, forced oscillation stop OSC circuit, switching power supply and stop working. Shutdown, check D1031 C1031 did not see abnormalities. After considering the fault is caused by element thermal stability become worse, so check D1031, C1031 using the substitution method, the result when using a 0.01 u F ceramics capacitors after substitution C1031, troubleshooting.FJQservice manual download site