Panasonic NE-3280 - Manual (Page 5)

Power Source'Viqlla^ Adjustment
Your microwave oven is factory set for 208 V
operation. For 220 V - 240 V operation, the following
adjustment MUST be made.
(Step 1) Unplug the oven.
(Step 2) Unscrew the voltage adjustment cover
which is located on the back of the oven.
Do not remove any other parts from the
oven.
(Step 3) Remove the connector from the white socket
and rotate it 180 degrees and plug it
into black socket, (see sketch)
(Step 4) Reattach the voltage adjustment cover
to the cabinet.
For 220 V - 240 V - Plug the connetcor into
black socket.
For 208 V---------------Plug the connector into
white socket.
CAUTION
Make sure that the power cord is unplugged
before removing the voltage adjustment cover.
How Does TÎié4yi|crowave 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;
approximately five inches in length. 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 to 1V 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 energy dissipates. It is not stored
in food.
Radio Inference
1 .Operation of the microwave oven may cause
interference to your radio, TV or similar equipment.
2. When there is interference, it may be reduced or
eliminated by taking the following measures:
a. Clean door and sealing surfaces of the oven,
(See Care of Your Microwave Oven found on page
14.)
b. Place the radio, TV, etc. away from the microwave
oven as far as possible.
c. Use a properly installed antenna, to obtain stronger
signal reception.
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