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Models No. NE-17521/NE-17523/NE-17723/NE-21521/NE-21523
The microwave automatically detects 208 V and 230 V–240 V. Insert the plug, and if the Digital Display Window
goes blank 10 seconds after use, unplug and insert the plug again.
How Does The Microwave Work?
Microwaves are a form of high frequency radio waves
similar to those used by a radio including AM, FM, and
CB. They are, however, much shorter than radio waves.
Electricity is converted into microwave energy by the
magnetron tube. From the magnetron tube, microwave
energy is transmitted to the oven cavity where it is:
reflected, transmitted and absorbed.
Reflection
Microwave are reflected by metal just as a ball is
bounced off a wall. A combination of stationary (interior
walls) and rotating antenna, located underneath the
bottom shelf and above the ceiling cover assure that
the microwaves are well distributed within the oven
cavity to produce even heating or cooking of foods.
Transmission
Microwave pass through some materials such as
paper, glass and plastic much like sunlight shining
through a window. Because these substances do not
absorb or reflect the microwave energy, they are ideal
materials for microwave oven heating containers when
covered.
Absorption
During heating, microwaves will be absorbed by food.
They penetrate to a depth of about
3
⁄4 to 1
1
⁄2 inches.
Microwave energy excites the molecules in the food
(especially water, fat and sugar molecules), and causes
them to vibrate at a rate of 2,450,000,000 times per
second. This vibration causes friction, and heat is
produced just as you will feel heat produced if you
vigorously rub your hands together. The internal
heating of larger foods is done by conduction. The heat
which is produced by friction is conducted to the center
of the food. Foods also continue to heat by conduction
during standing time. (“carry-over” cooking)
Because microwave dissipate, much like sunlight as it
reaches the Earth’s surface, they are not stored in food.
Radio Inference
Operation of the microwave oven may cause 1.
interference to your radio, TV or similar equipment.
When there is interference, it may be reduced or 2.
eliminated by taking the following measures:
Clean door and sealing surfaces of the oven. a.
(See Care of Your Microwave Oven found on
page 22.)
Place the radio, TV, etc. away from the microwave b.
oven as far as possible.
Use a properly installed antenna, on the radio to c.
obtain stronger signal reception.
Power Source Voltage Adjustment