[FONT=Calibri]The component with marking “9003 KAUCHB” controls the IGBT “20N120”. In a normal operation, the IGBT only “pulses” to create the magnetic field in the main coil. If the IGBT fails and gets shorted, full power will flow throw the coil and it will burn the whole appliance. The now-blown resistor is in series to prevent this situation as it will cut the current flowing to the main coil when it burns itself (that is my understanding).[/FONT]
[FONT=Calibri]The component “9003 KAUCHB” is located in a bad place on the board, next to the IGBT, where a lot of...
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UNOLD Elegance Typ no. 58105 induction hotplate - Component identification
Hi, I need help to identify the component with marking "9003 KAUCHB".
A bit of background...
I have an induction hotplate UNOLD Elegance Typ no. 58105 (with board CHK-A1.42S) which has a blown resistor.
I have also located the problem in the SOT23-6 component with the marking "9003 KAUCHB"; the pin 5 was disconnected from the IGBT emitter (ground) due to the high temperature and this caused the IGBT to be permanently ON.
I replaced the resistor and resoldered pin 5 of the SOT23-6 component to the IGBT, the hotplate worked for about a month and...1 Photo
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