Main sensor of induction cooker
In this step, you need to prepare the following materials: thin wire, one wire, 5.1K resistor one. Connect the 24 foot of the main IC with the IC3 9 foot of the LM339, and use the 5.1K resistor to connect the IC3 8 foot of the LM339 and the negative pole, and remove the R9. After the above steps, the electric coil in the boot disk case, 7 pin voltage with a multimeter measuring IC5 - TA8316AS, if the voltage is measured by the 1.07V, said synchronous oscillation driving circuit has been able to work properly. Disconnect the power supply, remove the 5.1K resistor, the wire with thin wire, and load the R9, then check the current detection circuit with reference. When the above steps are completed, the electric test machine is normal on the coil coil and the trouble can be eliminated.
Using the multimeter to check whether IGBT, rectifier breakdown of the damaged element is removed and replaced with the types of components. Check the resistance R310 and R311 with the universal meter. When measuring the two components, they must be disassembled to measure the accuracy and replace the damaged components. The following steps are not available
If the voltage to the IC5 seventh foot is not normal, then we measure the IC5 1 foot voltage is 0.73V, if the voltage is normal, it means that IC5 - TA8316AS has been damaged, after replacement, the fault can be eliminated. If the IC5 1 pin voltage is not normal, please check the synchronization circuit, please refer to specific - synchronous circuit troubleshooting process. If the synchronous circuit is no problem, then we will go to the oscillation circuit to check, first check R11, R12, R5, R15, R13, R14, D4, D1, D3, D2, C6 and whether there is damage, the damaged components change. (here) to illustrate the point: when the induction cooker can work properly, never use a multimeter to measure the voltage of the oscillating circuit. Because the meter itself has a certain interference, it is easy to interfere with the oscillation circuit, which will cause the IGBT to burn in the case of asynchronous operation. After completion of the above work, then measure the IC3 5 foot voltage is 12V, and if the voltage is not normal, please check the IGBT high voltage protection circuit, please refer to specific inspection - IGBT high voltage protection troubleshooting process. After completing the above procedure, check the IC5's 7 foot voltage in accordance with the above method. If the voltage is normal, it indicates that the fault has been eliminated.
