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The door lock assembly is made up of a coil, door switch,
switch actuator, locking fork, wax motor, auxiliary switch
and spin lock arm.
When a cycle is selected and the start pad is touched,
the control board applies power to the coil. The magnet
field of the coil pulls the locking fork down and tries to
pull
the contacts of the door lock switch closed. If the
washer door is open, a tab on the switch actuator prevents
the contacts from closing and the locking fork will not
allow the door to be closed until the stop pad is touched,
removing current from the coil. When the washer door is
closed, the door strike pivots the switch actuator out of
the way allowing the magnetic field of the coil to close
the contacts of the door lock switch and the locking fork
locks the door. The wax motor and spin lock arm are
used to prevent the door from being opened while the
spin basket is still spinning. Power is applied to the wax
motor when the washer is in spin. When power is applied
to the wax motor, it expands its piston within 30 to 40
seconds driving the spin lock arm between the locking
fork and the switch actuator holding the locking fork down.
At the same time, the piston closes the door lock
auxiliary switch allowing the washer to go into spin. When
power is removed from the wax motor, it takes about 90
seconds for the wax motor to cool down and retract the
piston, pulling the spin lock arm back away from the
locking fork and auxiliary switch . This provides enough
time for the spin basket to slow its rotation down to the
wash speed before the door could possibly be opened.
Contact
Wax Motor
Coil
Switch
Actuator
Locking
Fork
Pressure Switch (Good Models)
The pressure switch, mounted to the right side panel
under the top of the washer, controls the water level in
the washer.
The pressure switch is made up of a single pole double
throw switch, but only contacts 1 and 2 are used. The
contacts are controlled by a bellow inside a sealed
chamber. The chamber is connect by a hose to the air
bell located at the bottom of the washer attached to the
drain boot. L 1 is applied to the pressure switch, by the
control. If the water level is below 1/2 inch from the bottom
of the spin basket, contacts 1 to 2 of the pressure switch
close applying power to one side of the (3) solenoids of
the water valve assembly. The other side of the solenoids
are connected to neutral by a relay contact on the control
board. When the cycle calls for water, depending on the
water temperature selected and the increment of the
cycle, the control board connects one or two of three
solenoid coils to neutral activating the water valve
solenoids. When the correct water level is reached,
contacts 1 and 2 open, signaling the control to remove
neutral from the solenoids.
Auxiliary
Contacts
Spin
Lock
Arm