The cooker can not detect the cooker and alarm
If 300V, then use the voltage method and resistance method to determine whether the open circuit for a high power resistor, as shown below, the specific methods are as follows: first measure B voltage, normal is about 150V, if 0V, R1 may be open, open at one end of the R1 further detection of welding;
In the maintenance of the electromagnetic oven, when after boot beeps but was not detected in the pot, the easier after the first principle, the first bridge rectifier and the measured voltage is 300V, if only 200V, is likely to be 5u; F/400V capacitor loss;
If the B point voltage is 300V, then the C point voltage is measured. The normal voltage is about 2V-3V. If the voltage is 0V, it may be R2 open, and the one end of the welding is also detected. Other circuits with large power resistors are also detected by this method, so that there is no resistance open circuit. If the above test does not find a high power resistance open circuit, and then use other methods of maintenance.
