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2.4. ELECTRONICS - STRUCTURE
2.4.1. INTRODUCTION
The electronic part of the apparatus consists of two boards : the microprocessor + power pcb,
where every function is located and the user interface pcb with display, and LEDs. The former is
located inside the body of the machine, the second behind the front panel.
The electronic imbalance sensor is located on the motor stabilizer and allows the detection of
excessive imbalance due to the rotor loading.
2.4.2. MICROPROCESSOR + POWER PCB
On the microprocessor + power pcb, 3 distinct zones can be identified, whose functions are
described below. Each zone has its own independent power supply.
ZONE 1
This zone includes the microprocessor, the EPROM containing the software and the non-volatile
RAM containing the program parameters.
The set of components in this zone is at the potential of the microprocessor : 5 VDC.
ZONE 2
This zone ensures the conformity of the signal type coming from the different detectors before
their arrival at the microcontroller via opto couplers. It also monitors the lid lock control and
refrigeration group command.
The power supply for this zone is 12 VDC.
The different signals coming to this zone are :
- Bowl temperature
- Signal coming from the imbalance sensor
- Tacho signal
- Lid position signal
- The motor over temperature and the lid solenoid control
Service Manual 11290099
page 15 of 44
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