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Theory of Operation
MD24 and MD30
3-7
#824820 - Revision A - November, 2013
SENSOR COOKING CONDITION
Using SENSOR function, food is cooked without figur-
ing time, power level or quantity. When oven senses
enough steam from the food, it relays information to its
microprocessor which will calculate remaining cooking
time and power level needed for best results. When
food is cooked, water vapor is developed. Sensor
"senses" vapor and its resistance increases gradually.
When resistance reaches value set according to menu,
supplementary cooking is started. The time of supple-
mentary cooking is determined by experiment with
each food category and inputted into LSI.
Note: LSI - This is a microcomputer, responsible for
controlling the entire control unit.
Cooking Sequence:
1. Touch one of the SENSOR pads.
NOTE: The oven should not be operated on sensor
immediately after plugging in unit. Wait two min-
utes before cooking on SENSOR.
2. Coil of shut-off relay (RY-1) is energized, but power
transformer is not turned on.
3. After about 16 seconds, cook relay (RY-2) is ener-
gized. Power transformer is turned on, microwave
energy is produced and first stage is started. 16 sec-
onds is cooling time required to remove any vapor
from oven cavity and sensor.
NOTE: During this first stage, do not open drawer or
touch STOP/CLEAR pad.
4. When sensor detects vapor emitted from food, display
switches over to remaining cooking time and timer
counts down to zero. At this time, drawer may be
opened to stir, turn or season food.
5. When timer reaches zero, an audible signal sounds.
Shut-off relay and cook relay are de-energized and
power transformer, oven lamp, etc. are turned off.
6. Opening drawer or touching the STOP/CLEAR pad,
time of the day will reappear on display and oven will
revert to an OFF condition. When timer reaches zero,
an audible signal sounds.
