Sharp R-4H55 Service Manual page 7

SENSOR COOKING CONDITION
Using the SENSOR COOK, REHEAT SENSOR or SEN-
SOR INSTANT ACTION function, the foods are cooked or
defrosted without figuring time, power level or quantity.
When the oven senses enough steam from the food, it re-
lays the information to its microprocessor which will calcu-
late 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 ac-
cording to the menu, supplementary cooking is started.
The time of supplementary cooking is determined by ex-
periment with each food category and inputted into the LSI.
An example of how sensor works:
1. Potatoes at room temperature. Vapor is emitted very
slowly.
2. Heat potatoes. Moisture and humidity is emitted rap-
idly. You can smell the aroma as it cooks.
Cooking Sequence.
1. Touch each SENSOR COOK function pad to operating
the sensor cooking.
NOTE:The oven should not be onerated on SENSOR
COOK, REHEAT SENSOR or SENSOR INSTANT
ACTION immediately after plugging in the unit.
Wait five minutes before cooking on SENSOR
COOK, REHEAT SENSOR or SENSOR INSTANT
ACTION.
2.
3.
4.
Select desired Sensor setting.
Touch START pad (REHEAT SENSOR and SENSOR
INSTANT ACTION fuction are not neccessary to touch
START pad.) The coil of shut-off relay (RY-1) is ener-
gized, the turntable motor, oven lamp and cooling fan
motor are turned on, but the power transformer is not
turned on.
After about 16 seconds, the cook relay (RY-2) is ener-
gized. 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
5.
6.
7.
STOP/CLEAR pad
When the sensor detects the vapor emitted from the
food, the display switches over to the remaining cook-
ing time and the timer counts down to zero.
At this time, the door may be opened to stir food, turn it
or season, etc.
When the timer reaches zero, an audible signal
sounds. The shut-off relay and cook relay are de-ener-
gized and the power transformer, oven lamp, etc. are
turned off.
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.
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
5