Sensor Cooking Condition; Cooking Sequence - Sharp R-420BK Service Manual

R-420BK
R-420BW
DESCRIPTION OF OPERATING SEQUENCE
The following is a description
during oven ope ration.
of component functions
Sensor Cooking Condition
When using the SENSOR REHEAT 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 the power lev-
el 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 ex-
periment with each food category and is inputted into the
LSI
The following is an example of how the AH Sensor
Works:
1. Potatoes at room temperature
Vapor is emitted very slowly.
2. Heated potatoes . Moisture and humi dity is emitted
rapidly. You can smell the aroma as it cooks.
3. Sensor detects moisture and h umidity and
lates cooking time and va riable power level.
Cooking Sequence
calcu-
1. Touch SENSOR REHEAT pad.
Note: The oven should not be operated in either mode
immediately after plugging in the unit. Wait five
minutes before cooking in sensor mode.
2. The coil to the shut off relay (RY-1) is energized, the
oven lamp, turntable motor and cooling fan motor are
turned on and the power transformer remains off.
3. After about 16 seconds, the cook relay (RY-2) is en-
ergized. The power transformer is turned on, micro-
wave energy is produced and first stage cooking is
started.
Note: The 16 second delay is for cooling time required
to remove any vapor from the oven cavity and
sensor. During this first stage, do not open the
oven door or touch the STOP/CLEAR pad.
4.
5.
6.
When the sensor detects the vapor emitted from the
food, the display switches over 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-en-
ergized and the power transformer, oven lamp, etc.
are turned off.
By opening the door or touching the STOP/CLEAR
pad, the time of day will re-appear on the display and
the oven will revert to an OFF condition.