OPERATION
Microwave Combination Wall Ovens
n
2-3
Wiring Diagram & LOGIC Circuits - Main Oven
The wiring diagram shown, on the previous page, is for a Microwave Combination Oven with Convection
cooking in both ovens. Let’s look at the main oven first and point out a couple of interesting circuits
that could easily catch a seasoned tech off guard. Check out the NOTE at the bottom of the diagram
about the position of the door. Oven Doors Closed - means the oven light is off. Now take a look at the
door switch on the main oven wiring diagram. Switch is shown closed. So, lets talk about how I would
interpret this. Normally a closed door switch would tell me that the oven light is on - closed light circuit
= bright light. In this case, the closed light switch is telling the Appliance Manager that the light should
be off. Not a lot of techs would think much different. What’s really happening is that the closed light
switch is telling the AM the light should be off and the AM converts the information to open the K5
relay. The light switch is not turning the oven light on or Off, it just provides the necessary LOGIC to the
board and the AM operates the light.
Same thing with the oven LOGIC circuits to the AM. The LOGIC circuits supplies information to the board
- open or closed switches (Infinite or Zero resistance), oven temperature(OHMs resistance), and meat
probe temperature (OHMs Resistance), then the AM reacts to the information being supplied and
operates the required relays. Now, don’t think that if the oven light doesn’t work we need to change
the AM board, we need to verify that the board is receiving the correct information from the light
switch LOGIC circuit, and in this case if we want the light on, the light switch should be open.
In the diagram below we show the LOGIC circuits available on the conventional oven and the components
they have an input for. The door switch helps the board control the Oven Lights. The Motor Latch
Switch contributes information to the AM which in turn operates the Self-Clean Door Latch Motor. The
Oven Temperature Sensor and the Meat Probe Sensor LOGIC circuits have a great deal of input as to
how the Bake and Broil elements operate.
The LOGIC circuits provide information to the AM and the AM reacts accordingly.
Summary of Contents for JMW2430D
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