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Touch Pad/LED Assembly
Fig. 3-10
The Touch Pad/LED Assembly,
(Fig. 3-10)
, is removed as a single assembly and is connected to
the Central Control Unit by a ribbon cable. This assembly contains all of the buttons, LEDs and
ribbon cable and printed circuit boards for the user to operate the washer. This interfaces the
consumer inputs to the Central Control Unit.
Ribbon Cable
Touchpad/LED
Assembly
Central Control Unit (CCU)
The Central Control Unit is located at the top rear
of the washer and is enclosed in a control box.
(Fig. 3-11)
There are no serviceable parts inside
the control box. If diagnostic tests indicate any
component of the CCU is defective, the entire con-
trol box must be replaced.
The CCU receives input from the touchpad/LED
assembly and directly controls the dispenser,
drain pump, water inlet valves, door locking and
unlocking solenoids, and heating element relay.
The CCU monitors the pressure switch, flowme-
ter, temperature sensor and door lock switches.
The CCU sends the customer selection input to
the Motor Control Unit for proper motor operation.
Motor Control Unit (MCU)
The Motor Control Unit is located is inside a plas-
tic control box located in the lower front corner of
the washer cabinet.
(Fig. 3-12)
The control box
is shown with the access door open.
Fig. 3-11
The MCU operates the drive motor at varying
speeds and direction based on inputs received
by the CCU to complete the cycle selected. The
MCU also monitors a tachometer on the motor to
confirm that the drive motor is operating at the
proper speed and direction.
Drive Motor
The drive motor
(Fig. 3-13)
is a three-phase asyn-
chronous induction type that operates at various
speeds and direction based on input voltages and
frequencies. A tachometer on the motor shaft
sends a feedback signal to the Motor Control Unit
indicating the rotation speed and direction.
Fig. 3-12
Fig. 3-13