WD800B Galanz microwave oven door open after power on the bright lights, the turntable rotates, the fan starts and the display is not lit, all the function keys are inactive fault repair method |
| Time：2014-05-01 08:20:57 Source：Network Author：Unknown Clicks：1489 |
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When the microwave oven door closed and in a heated state , S1 is turned on , S3 a-b is turned on , RY1, RY2 pull , 220V electricity through the fuse FUSE, S1, S3a-b, S4, RY2 added to the high-voltage transformer primary while , RY1 is turned on , the oven lamp light , fan motors M1, M2 rotate the turntable motor . After the door opens , S1 OFF , S3 c toward a side of the movable contact , a-b is disconnected , a-c is turned on , RY1 is turned on , M1, M2 and the high-voltage transformer are de-energized to stop working, because only the oven lamp RY1 turned on and lit. At this time , if RY1 disconnected, 220V power through FUSE, the oven lamp , M1, M2, S3a-c, S4 constitute a loop , therefore , the oven lamp light , M1, M2 is rotated , causing the microwave heating is false . Since the display is not lit, determine fault exists in the computer control panel .qqzservice manual download site
Since no display , the first thought to check the power of computer-controlled portion of the board. Remove the control panel, alone across the primary of the transformer plus 220V AC , followed by measurement of AC voltage output level groups were 5.2V × 2 and 16V.
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