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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.

• 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 thd 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 =

1) Disconnect the leadwire from the Timer motor
2) Remove the screws for securing the control panel.
3) Lift control panel ASS ’Y from the oven by the tab

unhooked.

• 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

°

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

the earth terminal.

(refer to page 2-1)

5-4

1) Open the door.

3) Lift up and pull the door.

NOTE:
1. After replacing the door, be sure to check that the

primary switch, monitor switch, and secondary switch
operate normally.

2. After replacing the door, check for microwave energy

leakage with a survey meter. Microwave energy must
be below the limit of 5 mW/cm

. (with a 275 ml water

load)

3. When mounting the door assembly to the oven

assembly, be sure to adjust the door assembly parallel
to the chassis. Also adjust so the door has no play
between the inner door surface and oven frame
assembly. If the door assembly is not mounted
properly, microwaves may leak from the clearance
between the door and the oven.

1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from magnetron, high voltage

transformer, and capacitor.

3) Remove the screw holding the high voltage

transformer to the baseplate.

to the Cavity Ass'y.

2) Remove two screws holding the Hinge

1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from fan motor, noise filter

and high voltage capacitor.

3) Remove the two screws holding the orifice 

 

 

oven cavity and remove the high voltage

 

earth screw.

4) Remove the screw of the capacitor bracket.
5) Remove the two screws holding the fan motor ASS’Y

to the Orifice

1) Discharge the high voltage capacitor.

2) Disconnect the leadwire from fan motor, noise filter

and high voltage capacitor.

 

cavity

  and

  remove

  the

  high

  voltage

  diode

earth screw.

4) Remove the screw holding the high voltage capacitor

bracket.

3) Remove the screw holding the Orifice 

to the

diode

ASS’Y

.

ASS’Y

the oven

to

ASS’Y

Remove door Assembly

Remove door Assembly

5-5

1) Disconnect the leadwire from lamp, A.C Relay and

monitor resistor and magnetron.

2) Remove the screw to the cavity.

1) Disconnect the leadwire from the high voltage

transformer and high voltage capacitor.

2) Remove the air guide.
3) Carefully remove the mounting screws holding the

magnetron and the waveguide.

4) Remove the magnetron until the tube is

clear from the waveguide.

NOTE:
1. When removing the magnetron, make sure its

dome does not hit any adjacent parts, or it may be
damaged.

1) Remove the 

.

2) Remove the pully shaft VERY CAREFULLY 
3) Lay the unit down on its back.
4) Remove the turntable motor cover.

The turntable base cover is easily removed by

pinching the six parts with a wire cutting.

5) Disconnect the leadwire from the turntable motor

terminals.

6) Remove the screw securing the turntable motor to

the oven cavity ASS’Y

7) After rep

 the motor, rotate the removed

turntable motor cover.

8) Fit the turntable motor cover’s projecting part to the

base plate slit.

NOTE:
1. Remove the wire lead from the turntable motor

VERY CAREFULLY.

Waveguide

Magnetron
Gasket

Magnetron

Dome

Waveguide 
Bracket

Magnetron

2. When replacing the magnetron, be sure to install

the magnetron gasket in the correct position and
be sure that the gasket is in good condition.

3. After replacing the magnetron, check for microwave

leakage with a survey meter around the
magnetron. Microwave energy must be below the
limit of 5 mW/cm

2

. (With a 275 ml. water load).

To prevent microwave leakage, tighten the

mounting screws properly, making sure there is no gap
between the waveguide and the magnetron.

2. Be sure to grasp the connector, not the wires, when

removing

glass tray

lacing

Base plate

1) INTERLOCK MECHANISM

The door lock mechanism is a device which has
been specially designed to eliminate completely
microwave activity when the door is opened during
cooking and thus to prevent the danger resulting
from the microwave leakage.

2) MOUNTING OF THE PRIMARY/MONITOR/

SECONDARY SWITCHES TO THE LATCH
BOARD

3) INSTALLATION AND ADJUSTMENT OF THE

LATCH BOARD TO THE OVEN ASSEMBLY

• Mount the latch board to the oven assembly.
• Adjust the latch board in the arrow direction so that

oven door will not have any play in it when the door
is closed.

• Tighten the mounting screw.
• Check for play in the door by pushing the door

release button. Door movement should be less
than 0.5 mm. (1/64 inch)
Don't push the door release button while making
adjustment. Make sure that the latch moves
smoothly after adjustment are completed and that
the screws are tight. Make sure the primary, monitor,
and secondary switches operate properly by
following the continuity test procedure.

5-6

ADJUSTMENT
DIRECTION

MAGNETRON

H.V. TRANSFORMER

PRIMARY

H.V. CAPACITOR

H.V.
DIODE

1) Remove the control panel assembly from the

cavity.

2) Remove screws which hold the timer motor to the

control panel.

3) Remove the timer motor from the control panel. 
4) Remove the power control knob and the timer

knob.

PRIMARY
SWITCH

MONITOR
SWITCH

SECONDARY
SWITCH