NN-ST254MZPE - Panasonic Home Appliance Service Manual (repair manual). Page 13

5-3

1) Disconnect the power supply cord from the outlet.
2) Remove the screws from the rear and along side

edges of the case.

The outer case must be moved backward to be lifted

off.

1) Remove the outer case.
2) Disconnect two terminals, and remove one screw of

the earth terminal.

1) Disconnect the leadwire from the PCB SUB ASS’Y.
2) Remove the screws for the earth and securing the

control panel.

3) Lift control panel ASS’Y from the oven by the tab

unhooked.

• 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 of 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 190mm.

• The oven and the empty vessel are at ambient

temperature prior to the start of the test.

• The initial temperature (T1) 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
turntable which is in th  lowest position and the
microwave power switched on.

• The time T for the temperature of the water to rise by a

value 

∆ T of (10±2)°K is measured, where T is the time

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.

4187 x (

∆T) + 0.55 X (T

2

- T

0

) X M

T

• T

2

: Temperature after heating

• T

0

: Temperature of bowl

• M: Weight of bowl

is measured while the microwave generator is

operating at full power. Magnetron filament heat-up
time is not included. (about 3 sec)

• 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

TURNTABLE

P =

• The microwave power output P in watts is calculated

from the following formula :

NOTES:

For simple tests of micromave power output,

 it by heating one litre water for one minute,

minimum temperature rise should be 6  C 

conduct

°

(refer to page 2-1)

e