Sharp R-390B Service Manual page 7

SENSOR COOKING CONDITION
Using the Sensor Cooking function (See sensor cooking
menus), the foods are cooked without figuring time, power
level or quantity. When the oven senses enough steam
from the food, it relays the information to its microproces-
sor 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, supplementary cooking is started. The time of
supplementary cooking is determined by experiment with
each food category and inputted into the LSI.
An example of how sensor works: (SOUP)
1. Soup at room temperature. Vapor is emitted very
slowly.
2. Heat Soup. Moisture and humidity is emitted rapidly.
You can smell the aroma as it cooks.
SENSOR
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
Cooking Sequence.
1. Start the sensor cooking, referring to the operation
manual.
NOTE: The oven should not be operated on sensor cooking
condition immediately after plugging in the unit.
Wait two minutes before cooking on sensor cooking
condition.
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 power transformer is not turned on.
3. After about 16 seconds, the cook relay (RY-2) is
energized. The power transformer 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 key.
4. When the sensor detects the vapor emitted from the
food, the display 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 power transformer, oven lamp, etc. are turned off.
6. Opening the door or touching the STOP/CLEAR key,
the home page will reappear on the display and the
oven will revert to an OFF condition.
The followings are the sensor cooking menus.
* All menus of VEGETABLES
NOTE: During this first stage, do not open the door or
touch STOP/CLEAR key.
4. When the sensor detects the vapor emitted from the
food, the display switches over to the remaining cooking
time and the timer counts down to zero.
At this time, the door may be opened to stir food, turn
it or season, etc.
5. When the timer reaches zero, an audible signal sounds.
The shut-off relay and cook relay are de-energized and
the power transformer, oven lamp, etc. are turned off.
6. Opening the door or touching the STOP/CLEAR key,
the time of day will reappear on the display and the
oven will revert to an OFF condition.
The followings are the sensor cooking menus.
* All menus of VEGETABLES except for EXTRA
VEGETABLE RECIPES
* PRESERVES and STEWED FRUIT of OTHER
* PRAWNS of FISH/SEAFOOD
* All manus of CEREAL/GRAINS
* CANNED FOOD, CASSEROLES, DINNER PLATE,
PIE/PASTRY, PIZZA and SOUP of REHEAT
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R-390B