Sharp R-4H10 Service Manual page 6

R-4HlO
SENSOR COOKING CONDITION
Cooking Sequence.
Using the SENSOR COOK function, 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 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 in-
creases gradually. When the resistance reaches the
value set according to the menu, supplementary cook-
ing 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:
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.
1.
Touch SENSOR COOK pad.
NOTE:The oven should not be operated on SEN-
SOR COOK immediately after slugging in
the unit. Wait five minutes '
fre cooking
on SENSOR COOK.
2.
Select desired Sensor setting.
3. Touch START pad.
4.
The coil of shut-off relay (RY-1) is energized, the
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
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 re-
move any vapor from the oven cavity and sensor.
NOTE: During this first stage, do not open the door
5.
6.
7.
or touch STOP/CLEAR pad.
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.
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.
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.
(
RD71603U)
3. Sensor detects moisture and humidity and calcu-
iates cooking time and variable power.