This type of microwave oven with cooking , rice porridge , steamed and grilled , mixed cooking , thawing and other simple functions . Input Power : 1400W; output microwave power : 850W; Output frequency : 2450MHz. Users reflected microwave power , the display does not .hJUservice manual download site

AC power strip with an on- 5A ammeter to monitor microwave power meter no indication , determine the power circuit is open . Open the shell , to detect fuse with a multimeter ( non- transparent glass tube ) , found that the fuse is open. 10A fuse replaced with ordinary , power , display showing . But when on " Start" button , everything nothing. Also found burning fuse. Case because there is no principle circuit of the microwave oven ( refer to photo) , can only render the glass wall from the fuse metal powders judgment, there is a serious short circuit . According to all normal when the power supply situation analysis, fault should be in high-voltage circuits ( because pressing the " start" button is turned on high pressure ) . The main part of the device has four pressure : high-voltage transformer , rectifier diode , and a filter capacitor of the magnetron .hJUservice manual download site
 hJUservice manual download site

Method of detecting whether a short circuit transformer to detect the same with ordinary transformer. Just disconnect the secondary , the primary load current measurement can make judgments ; same detector diode and a method of measuring an ordinary silicon diode . High voltage diode forward voltage drop due to larger than normal diodes lot, as long as the multimeter's range into R × l0K block is solved ; magnetron if a short circuit , mainly the cathode and anode shorted ( usually grounded anode , cathode to the negative high pressure ) ; voltage capacitor terminal is negative high voltage output . According to the principles of the easier issues first , using a multimeter to measure the resistance line of high voltage across the capacitor , findings indicate 0. Disconnect the transformer and the only wiring capacitance connected . Then measured , still 0 . Determine high-voltage capacitors shorted. When open capacitor found high voltage rectifier diodes and capacitors installed in one piece. Detection of high-voltage diode ( use Rx 1OK block measurement ) , normal. No high voltage capacitor model , only marks : words 1.07μF/2100W VAC.

 2    1 2 Next Last