Electrolux ADW750EA, Service Manual

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Page 11
DISPENSING SYSTEM
Detergent & Rinse Aid Dispenser
The detergent and rinse aid dispenser consists of two
dispensers combined in one housing that are controlled
with one wax motor actuator. The first time the actuator
is energized in a cycle it dispenses detergent. The
second time the actuator is energized it dispenses rinse
aid. Using a pointer under the fill cap, the amount of
rinse aid dispensed may be adjusted from one (1) to
four (4) ml. The dispenser is replaced as a complete
assembly, no replacement parts are available. If a more
detailed explanation on how the dispenser operates is
desired; continue.
The dishwasher has two detergent cups, one is the
dispenser that has a spring loaded cover with a manual
or automatic release latch. The other cup is formed in
the inner door panel without a cover. Prior to starting
the dishwasher, detergent is added to the dispenser
cup and the cover is latched closed. The open cup is
also filled but empties into the tub as soon as the door
is lifted to the upright position.
The detergent in the covered cup is held until the start
of the second wash. The timer then supplies 120 VAC
to the dispenser actuator for one minute. It takes about
30 seconds for the actuator to move the pivot arm far
enough to release the cover. When power is applied to
the actuator, the actuator plunger pushes the end of the
pivot arm down. The pivot arm rotates on the shaft of
the detergent dispenser door latch. As the shaft rotates,
it turns the door latch releasing the spring loaded cover.
The pivot arm is spring loaded so that when power is
removed it returns to the normal (horizontal) position.
The other end of the pivot arm has a pin that moves in
a slot(s) of the rinse injector pump arm. The rinse
injector pump arm is slotted in such a way that when
the actuator pushes the lever down the first time to
release the detergent cup cover, the pin moves up but
does not raise the rinse injector pump arm. When the
timer removes power from the actuator, the spring
forces the rinse injector pump arm end of the pivot arm
down. The compound slot in the rinse injector pump
arm directs the pivot arm pin down the front of the rinse
injector pump arm and under a shorter slot in the center
of the arm. When the timer reaches the middle of the
final rinse cycle, it again applies 120 VAC to the
dispenser actuator which forces the pivot arm up at the
rinse injector end. As the pin engages the shorter slot it
raises the rinse injector pump arm which operates the
pump. When the power is removed, the pivot arm
spring forces the pin to the bottom of the slot. A leaf
spring pushes the rinse injector pump arm to the left so
that the pin returns to the original starting position.
DOOR LATCH ASSEMBLY
The door latch assembly has two functions, one is to
lock the door in a closed position and the other is to
operate the door switches.
The door latch assembly consists of the door handle,
door handle bracket, door catch, door switch bracket
and door switches. The assembly is secured to the
inner door panel with two locator pins and two screws.
The handle is hidden by, and accessed through the
control panel.
When the door is closed, the door strike, mounted on
the tub, forces the spring loaded catch to rotate back
until the bottom of the catch clears the door handle
bracket. At that time the spring forces the door handle
bracket to rotate. The bar on the top of the door handle
rotates back under the door catch locking the door. The
plunger on the bottom of the bracket rotates forward
closing the door switches.
The door is released by lifting up on the door handle.
When the handle is lifted up, the door handle bracket
rotates in at the top, allowing the door catch to rotate
open, and out at the bottom to open the door switches.
When the catch is rotated to the open position, it holds
the door handle bracket away from the door switches.