Function; Cpu Card A1 - Electrolux W4400H Service Manual

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Function

CPU card A1
The CPU card controls all functions of the washing machine using various
2
control programmes in the CPU card memory. The CPU card communi-
cates with the I/O card, display card and motor controller using a serial
interface.
The following functions are controlled:
• The CPU card controls the water valves, detergent supply, drain and
heating using one or two I/O cards. Depending on the number of func-
tions to be controlled, the number of I/O cards varies between different
machines.
• The CPU card controls the alphanumeric display window on the display
card.
• The CPU card controls the motor via a motor controller.
To obtain information about the various operations of the washing machi-
ne, the following inputs are used:
• The CPU card has inputs for e.g., temperature sensors.
• The CPU card receives information from the I/O card inputs about door
locking state and any external switches (e.g., Start/Stop and Pause).
• The CPU card has a pressure sensor to which a hose for measuring the
water level in the drum can be connected.
• The CPU card receives information from the display card about which
buttons were pressed.
Note that the CPU card does not contain any removable memory chips.
If the CPU card needs replacement, the correct software for the machine
needs to be programmed in the new card using a laptop with special soft-
ware. See the section "Replacing the CPU card". Personalised washing
programmes can be transferred using a Smart card.
Programme unit