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Measurement of Microwave Power Output
• Microwave power output measurement is made with
the microwave oven supplied at its rated voltage and
operated at its maximum microwave power setting with
a load of (1000 ± 5)g potable water.
• The water is contained in a cylindrical borosilicate
glass vessel having a maximum material thickness of
3 mm and an outside diameter of approximately 190
mm.
• The oven and the empty vessel are at ambient
temperature prior to the start of the test.
• The initial temperature (±1) of the water is (10±2)°C. It
is measured immediately before the water is added to
the vessel. After addition of the water to the vessel, the
load is immediately placed on the center of the shelf
which is in the lowest position and the microwave
power switched on.
• The time T for the temperature of the water to rise by a
∆T of (10±2)°K is measured, where T is the time
value
in seconds and ∆T is the temperature rise. The initial
and final water temperatures are selected so that the
maximum difference between the final water
temperature and the ambient temperature is 5°K.
Disassembly and Adjustment
A. OUT CASE REMOVAL
1) Disconnect power supply cord from the outlet.
2) Remove the screws from the rear and side section.
The out case must be moved backward to the lifted off.
B. POWER SUPPLY CORD
1) Remove the out case.
2) Disconnect two terminals from the noise filter assy
and remove one screw of the earth terminal.
CAUTION: DISCHARGE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 5)
C. REMOVING CONTROL PANEL
ASSEMBLY AND PCB ASSEMBLY
1) Disconnect the leadwire from the PCB SUB ASM.
2) Remove the screws for the earth and securing the
control panel.
3) Lift control panel assembly from the oven by the tab
unhooked.
• The microwave power output P in watts is calculated
from the following formula:
4187 X (∆T) + 0.88 X (T
P =
• T
: Temperature after heating
2
• T
: Temperature of bowl
0
• M: Weight of bowl
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included.
• The water is stirred, to equalize temperature
throughout the vessel, prior to measuring the final
water temperature.
• Stirring devices and measuring instruments are
selected in order to minimize addition or removal of
heat.
Water Load
4) Remove three screws securing the PCB SUB ASM
from the control panel.
5) Remove the digitron window.
NOTE : Remove the leadwire and connector VERY
CAREFULLY. Be sure to grasp the connector
and not the wires.
5-3
- T
) X M
2
0
T
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