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21

1. CARRY OUT 3D CHECKS.
2. Remove the outer case.
3. Disconnect the wire leads from the switches.
4. Push outward on the one (1) retaining tabs holding

switch in place.

5. The switch is now free.
Reinstallation
1. Re-install each switch in its place. The 1st. interlock

switch is in the lower position and the 2nd interlock
relay control switch is in the upper position. The monitor
switch is in the middle position of the latch hook.

2. Re-connect wire leads to each switch.

Refer to pictorial diagram.

3. Make sure that the monitor switch is operating properly

and check continuity of the monitor circuit. Refer to
chapter "Test Procedure" and Adjustment procedure.

1. CARRY OUT 3D CHECKS.
2. Remove the outer case.

If the 1st. interlock switch, 2nd. interlock relay control
switch  and monitor switch do not operate properly due to
a misadjustment, the following adjustment should be made.
3. Loosen the two (2) screws holding latch hook to the

oven cavity front flange.

4. With door closed, adjust latch hook by moving it back

and forth, and up and down. In and out play of the door
allowed by the upper and lower position of the latch
hook should be less than 0.5mm. The vertical position
of the latch hook should be adjusted so that the 1st.
interlock switch and 2nd. interlock relay control switch
are activated with the door closed. The horizontal
position of the latch hook should be adjusted so that the
plunger of the monitor switch is pressed with the door
closed.

5. Secure the screws with washers firmly.
6. Check the operation of all switches. If each switch has

not activated with the door closed, loosen screw and
adjust the latch hook position.

After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when

in the latched position. First check upper position of
latch hook, pushing and pulling upper portion of door
toward the oven face. Then check lower portion of the

latch hook, pushing and pulling lower portion of the
door toward the oven face. Both results (play in the
door) should be less than 0.5mm.

2. The contacts of 1st. interlock switch and 2nd. interlock

relay control switch open within 1.6mm gap between
right side of cavity face plate and door when door is
open.

3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage

around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)

REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the outer case.
3. Remove the two (2) screws holding the front leg to the

base plate.

4. Remove the front leg from the oven cavity by releasing

the three (3) tabs.

5. Remove the harness cover from the front leg.
6. Disconnect the 7-pin wire harness from the power

unit on the base plate.

7. Insert a putty knife (thickness of about 0.5mm) into the

gap between the choke cover and door frame as shown
in Figure C-5 to free engaging parts.

8. Pry the choke cover by inserting a putty knife as shown

Figure C-5.

9. Release choke cover  from door panel.
10.Now choke cover is free.

11.Release two (2) pins of door panel from two (2) holes

of upper and lower oven hinges by lifting up.

Latch 
Heads

Door

Latch Hook

2nd. Interlock
Relay Control 
Switch

1st. Interlock
 Switch

Monitor Switch

Choke Cover

Door Frame

Putty Knife

22

Sealer film

Backing film

Adhesive tape

microwave energy from oven cavity during cook
cycle. This function does not require that door be
air-tight, moisture (condensation)-tight or light-tight.
Therefore, occasional appearance of moisture, light
or sensing of gentle warm air movement around
oven door is not abnormal and do not of themselves
indicate a leakage of microwave energy from oven
cavity.

12.With pulling out the 7-pin wire harness from the hole of

the oven cavity front plate, remove the door from the
oven cavity.

13.Now, the door is free from the oven cavity.

REINSTALLATION
1. Re-install the front leg to the oven cavity front plate.
2. Hold the front leg to the base plate with (2) screws.
3. Insert the 7-pin wire harness to the holes of the front leg

and the oven cavity front plate.

4. Catch two (2) pins of door panel on two (2) holes of

upper and lower oven hinges.

5. Re-install choke cover  to door panel by pushing.
6. Connect the 7-pin wire harness to the power unit on the

base plate.

7. Re-install the harness cover to the front leg.
8. Now the door is installed.

After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through

latch holes and that latch head goes through center of
latch hole.

2. Deviation of door alignment from horizontal line of

cavity face plate is to be less than 1.0mm.

3. Door is positioned with its face pressed toward cavity

face plate.

4. Check for microwave leakage around door with an

approved microwave survey meter.  (Refer to Microwave
Measurement Procedure.)

Note: The door on a microwave oven is designed to act

as an electronic seal preventing the leakage of

Installation
1. Put the adhesive tape on the backing film of the sealer

film as shown in Fig. C-8.

2. Tear the backing film by pulling the adhesive tape.
3. Put the pasted side of the sealer film on the door panel.

DOOR PANEL
1. CARRY OUT 3D CHECKS.
2. Remove the door from the oven. Refer to "DOOR

REPLACEMENT".

3. The choke cover should have been removed.
4. Remove the four (4) screws holding the door panel to

the door screen.

5. Now, door panel is free.

LATCH HEAD AND LATCH SPRING
6. Slide the latch head and remove it from the door

frame assembly with releasing the latch spring from
the door frame assembly and the latch head.

7. Now, the latch head and the latch spring are free.

CPU UNIT
6. Remove the two (2) screws holding the PWB cover to

the door frame assembly.

7. Remove the PWB cover from the door frame assembly.
8. Remove the one (1) screw holding the CPU unit to the

door frame assembly.

9. Releasing the two (2) tabs, remove the CPU unit with

the LCD holder from the door frame assembly.

10.Releasing the two (2) tabs, release the LCD from the

LCD  holder.

11.Releasing the four (4) tabs, remove the LCD holder

from the CPU unit.

12.Disconnect the 7-pin wire harness from the CPU unit.

Pin

Pin

Upper oven
hinge

Upper 
oven hinge

Lower 
oven hinge

Lower 
oven hinge

Choke cover

Slit choke of
door panel

Door frame
assembly

Door frame

Front leg

Front leg

7-pin wire 
harness

7-pin wire 
harness

Power unit

Base plate

Hole

Hole

Door

23

13.Disconnect the ribbon cable of the key unit from the

CPU unit.

14.Now the CPU unit is free.

DOOR FRAME ASSEMBLY
15.Releasing the four (4) tabs, remove the 7-pin wire

harness from the door frame assembly.

16.Now, the door frame assembly is free.

1. Before the PWB cover is reinstalled to the door

frame assembly, route the 7-pin wire harness
under the tab of LCD holder as shown in Figure C-
9(a). And when the PWB cover is reinstalled, route
the 7-pin wire harness under the hole of the PWB
cover.

2. Before the door panel is reinstalled to the door

frame assembly, make sure that the 7-pin wire
harness is held by the four (4) tabs and two (2)
holes on the door frame assembly as shown in
Figure C-9(b).

1. Before attaching a new key unit, wipe off  remaining

adhesive on the door frame surfaces completely
with a soft cloth soaked in alcohol.

2. When attaching the key unit to the door frame,

adjust the upper edge and right edge of the key
unit to the correct position of door frame.

3. Stick the key unit firmly to the door frame by

rubbing with soft cloth not to scratch.

Handle the CPU unit carefully so that the ribbon
cable does not come off. Because the ribbon cable
is glued on the LCD and the printed wiring board
only by heated paste.

Printed wiring board 

of CPU unit

Liquid Crystal

Display (LCD)

Ribbon cable

PWB Cover

CPU unit

Door frame

7-pin wire 
harness

Hole of 
PWB cover

Tab of LCD holder

PWB Cover

Hole of
PWB Cover

Tab

Tab 

Tab

Hole on door frame

Hole on door frame

Door frame

Tab

7-pin wire harness

24

After any repair, the microwave oven must be checked for
microwave leakage to ensure continued safe operation.
BS EN 60335-2-25 specifies that the maximum permitted
leakage with a load of 275 ml is 50 W/m

2 

(equivalent to 5

mW/cm

2

)

 

at  a distance of 5 cm from the oven.

The following items are required to carry out this test:-
1.  A low form of 600 ml beaker made from an electrically

non-conductive material, such as glass or plastic, with
an inside diameter of approximately 8.5 cm. This must
contain 275 

±

 15 ml of water, at an initial temperature

of 20 

±

 2˚C.

2. A leakage detector which has been calibrated within

the preceding 12 months to a stand whose accuracy
can be traced to National Physical Laboratory
Standards.

Recommended instruments are:

Apollo "XI"
Celtec "A100"

Before commencing the test, check that the leakage
detector is functioning and adjusted according to the
manufacturer's instructions, and any spacers are fitted to
ensure that measurement is taken 5cm from the surface of
the oven.

1. Place the beaker containing the water load in the oven

cavity at the centre of the turntable. The placing of this
standard load in the oven is important, not only to
protect the oven, but also to ensure that any leakage it
is not disguised by too large a load absorbing energy.

2. Close the oven door, and with the power level set to

FULL, turn the oven ON with the timer set for a few
minutes operation. Should the water begin to boil
before the test has been completed, it should be
replaced.

3. As shown in the diagram below, move the probe slowly

(not faster than 2.5 cm/sec.);-

a) around the edge of the door following the gap
b) across the face of the door
c) across any vents in the oven's sides, rear or top

Dotted line indicates the path taken by the leakage detector.