Whirlpool GHW9100L, GHW9200L manual Touch Pad/LED Assembly, Central Control Unit CCU, Drive Motor

Touch Pad/LED Assembly

Touchpad/LED

Assembly

Fig. 3-10 Ribbon Cable

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.

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.

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.

Fig. 3-12

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. 3-11

Motor Control Unit (MCU)

Fig. 3-13

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.

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