Electrolux WASHING MACHINES Service Manual page 36

The overall structure of the microprocessor memory on the main PCB is subdivided into three sections:
ROM This area of memory contains the software with the general instructions that control the
operation of the appliance, such as those of the electrical components and alarms. The ROM is
set up by the manufacturer of the microprocessor, and cannot be modified.
RAM This part of memory contains all the variables used during the execution of the wash
programme, which are written in dynamic format. The RAM can be read using a DAAS interface.
EEPROM This area of memory contains:
⇒ the data necessary to restart the appliance in case of a power failure.
⇒ the parameters for the wash cycle, such as water fill level, speed and type of motor
movement, and the temperature during the various phases of the wash cycle. Once written,
this data is protected and, normally, can be read only using a DAAS interface.
⇒ data relative to the configuration of the appliance, such as the speed of the final spin phase,
the volume of the tub, the type of washing system, etc. This data may be entered either via a
DAAS interface or via the control/display board.
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