8 ELECTRICAL COMPONENTS 8.1 Control systems The operation of the appliance depends on the type of control system used, since the control system governs the various operations comprising the washing cycle. For further details regarding the various functionalities, refer to the specific Service Manuals issued for each type of timer/electronic control system. SOI/DT 2002-05 eb 60 599 35 23-17 Types of control systems • Electromechanical timers (F50-F51-F52-F53): the controls are actuated by the commutator contacts, which are actioned by a series of cammes. This movement is transmitted to the cammes by a synchronous motor via a series of gears and levers.
• Integrated hybrid timers (VD54-VD55-VS60-VS71-VS81): These consist of two components: an electromechanical timer and a control PCB. The control board is soldered directly to the connectors of the timer, and performs the following functions: - controls the washing programmes and the various options - powers the timer motor - powers and controls the drum rotation motor All the other components of the appliance are powered by the timer contacts. • Hybrid timers (VA20, VA30J): These consist of two components: an electromechanical timer and a control PCB. The control board is fitted to the base of the appliance, and performs the following functions:
- controls the washing programmes and the various options - powers the timer motor - powers and controls the drum rotation motor All the other components of the appliance are powered by the electromechanical timer. • Electronic control systems: → EWM2000: The main PCB (1), to which the microprocessor is fitted, powers the components of the appliance via a triac and a relay, and controls the various parameters for the functional control of the washing programme. The control/display board (2) acts as an interface between the user and the main PCB. This board is fitted with the various buttons for selection of the washing cycle options, and a series of LEDs.
According to the model, programmes may be selected using the buttons or a programme selector knob. → EWM1000: The functions of the main PCB and the display board are integrated in a single PCB (2).