p57
The main board controls all the functions of the COMBO. All the sensors
in the machine report to the main board and the microprocessor makes all
adjustments based on sensor input. There are no panel controls for such
things as water level or washing time because these are determined via
fuzzy logic based on the selected cycle and sensor input.
The main board is potted into a plastic case to protect it from vibration and
water. It cannot be repaired and must be replaced as an assembly.
The connectors on the main board are color coded (See Wiring Diagram,
next slide.) and are unique. It is not possible to cross the connectors. They
are identifiable by pin count, conductor count, and shape, as shown on the
diagram. Two of the less common color abbreviations on the diagram are
SB (Sky Blue) and NA (Natural, which is cream or white.)
Main Board
WM3677HW
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