The FS406 smart rice cooker is energized without heating
The fault phenomenon shows that the power supply, reset and oscillation circuit on the display board are working properly. The cause of the failure may be the open of the heating plate, the damage of the relay, or the abnormity of the relevant control circuit.
Check whether the relay control transistor is normal. The measured output voltage of the relay is 0V, and the normal voltage should be 0.7V. Check along the line, and found that the chip connected with the control chip resistor R31 whether open circuit, after the new troubleshooting.
First of all, in the power off state, with Multimeter resistance to measure the heating plate and relay DC resistance are normal. After the power is measured, the working voltage of the relay is 0V, thus judging the problem of the relay control circuit.
