Troubleshooting: The machine uses a 14021WFW microprocessor as the program controller. The measured AC power supply voltage is 220V, which is normal, and the secondary voltage of the transformer is 8V, also normal, indicating that the transformer is in good condition. The DC voltage across the filter capacitor C7 is measured to be 12V, indicating that the filter capacitor C7 and rectifier diodes D1, D2, D3, D4 are all in good condition. When measuring the emitter and base voltages of the regulator transistor BG11 in the voltage stabilizing circuit, it was found that the base voltage was 0.7V, whereas it should normally be 6.7V. Upon checking the related components D19, D8, R28, and BG11, it was discovered that the Zener diode D19 had been damaged, causing the voltage stabilizing circuit to malfunction and leading to the aforementioned fault. After replacing D19, the operating voltages of each terminal of BG11 were re-measured and found to be normal. A test run after starting the machine confirmed that the washing machine was functioning properly, thus resolving the fault.
Article source: Beijing Sanyo Washing Machine Repair Phone Number http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3442560. Sanyo Washing Machine, indicator light not on, washing machine not working.
Fault Analysis: Based on the fault symptoms, there may be a problem with the power supply system of the microprocessor or the clock oscillator circuit of the microprocessor program controller may not be functioning properly.