Measurement Of Microwave Power Output; Disassembly And Adjustment - LG SolarDOM MP-9483SL Service Manual

MEASUREMENT OF MICROWAVE POWER OUTPUT

• Microwave power output measurement is made with
the 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 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.

DISASSEMBLY AND ADJUSTMENT

A. OUTER CASE REMOVAL
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.
B. POWER SUPPLY CORD
1) Remove the outer case.
2) Disconnect two terminals, and remove one screw of
the earth terminal.
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 2-1)
• The microwave power output P in watts is calculated
from the following formula :
4187 x
P =
• T
2
• T
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
C. CONTROL PANEL ASSEMBLY
1) Disconnect the leadwire from the PCB SUB ASS'Y.
2) Remove the screws for the control bracket and
securing the control panel.
3) Remove control panel ASS'Y from the oven by the
moving control panel ASS'Y right side.
5-3
(∆T) + 0.55 X (T -T
2 0
T
: Temperature after heating
: Temperature of bowl
TURNTABLE
)X M