R-291KM - Sharp Home Appliance Service Manual (repair manual). Page 8

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1. 1.Operate the oven in sensor cooking mode by referring to the

operation manual.

NOTE: The oven should not be operated on SENSOR immediately

after plugging in the unit. Wait two minutes before cooking on
SENSOR.

2. The coil of shut-off relay (RY-1) is energized, the turntable motor,

oven lamp and cooling fan motor are turned on, but the inverter unit
is not turned on.

3. After about 16 seconds, the cook relay (RY-2) is energized. The

inverter unit is turned on, microwave energy is produced and first
stage is started. The 16 seconds is the cooling time required to
remove any vapor from the oven cavity and sensor.

NOTE: During this first stage, do not open the door or touch STOP/

CLEAR pad.

4. When the sensor detects the vapor emitted from the food, the dis-

play switches over to the remaining cooking time and the timer
counts down to zero. At this time, the door may be opened to stir,
turn, or season food.

5. When the timer reaches zero, an audible signal sounds. The shut-

off relay and cook relay are de-energized and the inverter unit,
oven lamp, etc. are turned off.

6. Opening the door or touching the STOP/CLEAR pad, the time of

day will reappear on the display and the oven will revert to an OFF
condition. The fan motor will operate for one minute after cooking.

R-291(K)M

Using the SENSOR function, the food is cooked without figuring time,
power level or quantity. When the oven senses enough steam from the
food, it relays the information to its microprocessor which will calculate
the remaining cooking time and power level needed for best results.
When the food is cooked, water vapor is developed. The sensor
“senses” the vapor and its resistance increases gradually. When the
resistance reaches the value set according to the menu, supplemen-
tary cooking is started. The time of supplementary cooking is deter-
mined by experiment with each food category and inputted into the
LSI.

An example of how sensor works: (JACKET POTATOES)

1. Potatoes at room temperature. Vapor is emitted very slowly.

2. Heat potatoes. Moisture and humidity is emitted rapidly. You can

smell the aroma as it cooks.;

3. Sensor detects moisture and humidity and calculates cooking time

and variable power.

MICROWAVE

MICROWAVE

HUMIDITY SENSOR