The principle is: the microprocessor program controller, power switch, water pressure switch, safety switch, solenoid valve, the water drainage electromagnet, motor and start capacitance constitutes a washing machine control system. fmEservice manual download site
 fmEservice manual download site
Set according to program after start the washing machine, electricity, the microprocessor program controller according to the set of input signals to the control system, according to the setting of the microprocessor procedure, were driven into the water, drainage electromagnet, solenoid valve, motor power switch action, such as washing machine automatically wash, rinse and different functions such as dehydration. fmEservice manual download site
 fmEservice manual download site
It except with automatic control function such as water, washing, water drainage, dehydration, also has the unbalanced supply water automatically, automatic correction dehydration and open alarm, dewatering and drainage abnormal alarm, no water detection, automatic power switch power and other special functions. Puts program controller washing work state, electricity, power program controller input, intake solenoid valve, motor coil output voltage for Ov sometimes, sometimes is 220 v (under normal working condition should be 220 v), step by step to check program controller of related components, found the bidirectional thyristor VS1 VT1 trigger circuit of the transistor base resistance Rl end disconnected, lose the bidirectional thyristor VS1 control effect, and cause failure. After replace the resistor Rl, commissioning, troubleshooting.fmEservice manual download site