3
23
23. Programme unit
438 9149-81/06
04.03
Service
Manual
Fig.
1
Fig.
2
Description
General
The programme unit is electronically controlled
and occupies half of one of the PCBs. One half of
the card holds a microprocessor, the programme
memory, voltage supply circuits, etc. The other
half holds relays and noise suppressing
components.
The programme unit receives information from
the temperature sensors, the door lock and the
level guard on the card. There is also a serial
interface for the motor controller.
The programme unit controls the water and drain
valves as well as heating via the communication
card, door locking/unlocking via the door lock
controller and the motor via the motor control.
Door lock control
A31
Motor
control U1
Level
guard
B2
Heating
elements
Voltage
supply
K21
M1
Door lock
A41
Programme unit
A1
Transformer
Y10
Communication card A21
Water
valves
Drain
valve
B1
Level guard
Z1
5187
E1 E2 E3
B3
2
5185 5186
1
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