Washing Machine Diagram / August 28, 2018 / Amber Dumas.
The master timer is realised with monostable IC 555 (IC1) and its ‘on’ time is decided by the resistance of 1-mega-ohm potmeter VR. A 47-kilo-ohm resistor is added in series so that even when the VR knob is in zero resistance position, the net series resistance is not zero.
These switches also look a lot like washing machine pressure switches, except they have multiple electrical terminals (six or even nine) and don't have external level adjustment. However, some have screwdriver adjustment for both the trip levels and the hysteresis. When extracting the pressure switch from a washing machine, be careful that you don't also inadvertently
The only sure way to tell if a element is faulty, even if all the above faults are present, is to use whats called a ohmmeter, a ohmmeter is a device used for testing all types of electrical values, including resistance between 2 conductive device. To test if a element is working or not a engineer would connect a ohmmeters live and neutral wires to the corresponding connectors on the element and check for a positive reading, no reading would mean a faulty element, the engineer would also use the ohmmeter to read across both terminals again and the earth terminal on the element but in this case a positive reading would mean a faulty element and a negative reading would mean no fault on the earth to live and earth to neutral connectors
The motor cannot be reversed instantly. It needs a brief pause between switching directions, or else it may get damaged. For this purpose, another spin direction control timer (IC2) is employed. It is realised with an IC 555. This timer gives an alternate ‘on’ and ‘off’ time duration of 10 seconds and 3 seconds, respectively. So after every l0 seconds of running (either in clockwise or anticlock-wise direction), the motor stops for a brief duration of 3 seconds. The values of R3 and R4 are calculated accordingly.