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R86STM

11 – 4

1. CARRY OUT 3D CHECKS.

2. Push the lever of positive lock

®

 connector.

3. Pull down on the positive lock

®

 connector.

Figure C-1. Positive lock

® connector

CAUTION: WHEN CONNECTING THE POSITIVE LOCK

®

 CON-

NECTORS TO THE TERMINALS, CONNECT THE POS-
ITIVE LOCK

®

 SO THAT THE LEVER FACES YOU.

1. CARRY OUT 3D CHECKS.

2. Remove the wire leads as Positive lock

®

 connector removal

above.

3. Lift up the oven lamp from its retaining clips.

Now, the oven lamp is free.

1. CARRY OUT 3D CHECKS.

2. Remove the one (1) screw holding the green/yellow wire to the cav-

ity back plate.

3. Disconnect the leads of the power supply cord from the noise filter,

referring to the Figure C-4(a).

4. Release the power supply cord from the rear cabinet.

5. Now, the power supply cord is free.

Figure C-4 (a) Power Supply Cord Replacement

1. Insert the moulding cord stopper of power supply cord into the

square hole of the cavity back plate, referring to the Figure C-4(b).

2. Install the earth wire lead of power supply cord to the oven cavity

with one (1) screw and tight the screw.

3. Connect the brown and blue wire leads of power supply cord to the

noise filter correctly, referring to the Pictorial Diagram.

Figure C-4(b). Power Supply Cord Replacement

1. CARRY OUT 3D CHECKS.

2. Remove the two (2) screws holding the two (2) terminals of the

main wire harness to the top heating element.

3. Remove the two (2) screws holding the two (2) grill heater angles to

the top of the oven cavity.

4. Remove the two (2) grill heater angles from the oven cavity.

5. Remove the top heating element from the top of the oven cavity.

6. Now the top heating element is free.

Terminal

Push

Pull down

1

2

Lever

Positive lock¨

connector

Figure C-1. Positive lock, connector

Lock

Socket

Bulb

Oven lamp

Power supply cord

Green/ Yellow-
wire

Brown wire

Oven cavity back plate

Blue wire

Noise filter

Screw

L

TP

F 8 A

TL

RED

20

A

WHT

N

POWER
SUPPLY CORD

MOULDING
CORD STOPPER

OVEN CAVITY
BACK PLATE

SQUARE HOLE

R86STM

11 – 5

1. CARRY OUT 3D CHECKS.

2. Remove the turntable motor cover from the base plate, referring to

“TURNTABLE MOTOR REPLACEMENT”.

3. Disconnect the wire leads from the bottom heating element.

4. Remove the two (2) nuts holding the heater cover and heater pack-

ing to the bottom heater.

5. Remove the heater cover and the heater packing from the bottom

heating element.

6. Remove the two(2) nuts holding the bottom heating element to the

oven cavity.

7. Remove the bottom heating element from the oven cavity.

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads and the connectors from the control unit.

3. Remove the one (1) screw holding the control panel assembly to

the oven cavity front plate.

4. Lift up the control panel assembly and pull it forward.

Now the control panel assembly is free.

At this time, the earth spring will be free. Do not lose it.

1. CARRY OUT 3D CHECKS.

2. Remove the control panel assembly, referring to chapter of CON-

TROL PANEL ASSEMBLY REMOVAL.

3. Disconnect the ribbon cable of the membrane switch from the con-

nector (CN-G) on the control unit.

4. Tear away the graphic sheet from the control panel frame.

5. Tear away the membrane switch from the control panel frame.

1. Remove remaining adhesive on the control panel frame surfaces

with a soft cloth soaked in alcohol.

2. Tear the backing paper from the new membrane switch.

3. Insert the ribbon cable of the membrane switch into the slit of the

control panel frame.

4. Adjust the upper edge and right edge of the membrane switch to

the small depression on the surface of the control panel frame. 

5. Attach the membrane switch to the control panel frame by rubbing

with a soft cloth not to scratch.

6. Tear the backing paper from the new graphic sheet.

7. Adjust the upper edge and right edge of the graphic sheet to the

large depression on the surface of the control panel frame. 

8. Attach the graphic sheet to the control panel frame by rubbing with

a soft cloth not to scratch.

9. Connect the ribbon cable of the membrane switch to the connector

(CN-G) on the control unit.

 Figure C-5. Graphic Sheet and Membrane Switch Replacement

1. CARRY OUT 3D CHECKS.

2. Remove the control panel assembly referring to “CONTROL

PANEL ASSEMBLY REMOVAL”.

3. Remove the open lever from the oven cavity front plate by remov-

ing the control panel assembly.

4. Disconnect the leads from all switches.

5. Remove the two (2) screws holding the latch hook to the oven cav-

ity.

6. Remove the latch hook.

7. Remove the switch(es) from the latch hook by pushing the retaining

tab backwards slightly and turning the switch(es) on the post.

8. Now the switch(es) is free

Figure C-5. Switches

If the monitored latch switch, stop switch and monitor switch do not

operate properly due to a mis-adjustment, the following adjustment
should be made.

Small depression

Control panel frame

Slit

Membrane switch

Ribbon cable

Large
depression

Graphic sheet

MONITOR SWITCH

STOP SWITCH

MONITORED
LATCH SWITCH

TAB

TAB

TAB

R86STM

11 – 6

1. CARRY OUT 3D CHECKS.

2. Loosen the two (2) screws holding the latch hook to the oven cavity

front flange.

3. 3. With the door closed, adjust the latch hook by moving it back and

forward or up and down. In and out play of the door allowed by the
latch hook should be less than 0.5mm. The horizontal position of
the latch hook should be placed where the monitor switch has acti-
vated with the door closed. The vertical position of the latch hook
should be placed where the monitored latch switch and stop switch
have activated with the door closed.

4. Secure the screws with washers firmly.

5. Make sure of the all switches operation. If the latch head has not

pushed the plungers of the monitor switch with door closed, adjust
the latch hook position. At that time, the latch head should have
pushed the plungers of the monitored latch switch and stop switch.
If the latch head has not pushed the plungers of the monitored latch
switch and stop switch with door closed, loose two (2) screws hold-
ing latch hook to oven cavity front flange and adjust the latch hook
position.

1. In and out play of door remains less than 0.5mm when latched

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

2. The stop switch interrupts the circuit before the door can be

opened.

3. When the door is opened, the contacts (COM-NC) of the monitor

switch and monitored latch switch close. And the contacts (COM-
NO) of their switches open. 

4. When the door is closed the contacts (COM-NC) of the monitor

switch and monitored latch switch open. And the contacts (COM-
NO) of their switches close.

5. Reinstall outer case and check for microwave leakage around the

door with an approved microwave survey meter. (Refer to Micro-
wave Measurement Procedure.)

Figure C-6 Latch Switches Adjustment

1. REMOVAL
DOOR FRAME ASSEMBLY

1. Disconnect the oven from the power supply.

2. Push the open button and open the door slightly.

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

between the choke cover and door frame as shown in Figure C-8 to
free engaging parts.

4. Release choke cover from door panel.

5. Now choke cover is free.

NOTE: When carrying out any repair to the door, do not bend or warp

the slit choke (tabs on the door panel assembly) to prevent
microwave leakage.

Figure C-8. Door Disassembly

6. Lift the door upwards.

7. Now, door frame assembly is free from oven cavity.

DOOR PANEL

8. Remove the six (6) screws holding the door panel to the door

frame.

9. Now, door panel is free.

LATCH HEAD AND SPRING

10.Slide latch head upward and remove it from door frame with releas-

ing latch spring from door frame and latch head.

11.Now, latch head and latch spring are free.

12.Remove the two (2) door glass stopper from the door frame.

13.Remove the front door glass from the door frame by sliding right-

wards.

14.Now, the front door glass is free.

1. Insert the front door glass to the door frame.

2. Fit the two (2) door glass stopper to the door frame to hold the front

door glass.

3. Reinstall the latch spring to the latch head. Re-install the latch

spring to the door frame. Re-install latch head to door frame.

4. Reinstall door panel to door frame.

5. Hold the door panel to the door frame with six (6) screws.

6. Located door panel hinge pins into cavity hinge location hole.

7. Reinstall choke cover to door panel by clipping into position.

NOTE: After any service to the door;

1) Make sure that the monitor switch, monitored latch

2) An approved microwave survey meter should be used

LATCH
HEADS

LATCH HOOK

DOOR OPEN BUTTON

OPEN LEVER

DOOR

MONITOR SWITCH

MONITORED LATCH
SWITCH

STOP SWITCH

Choke Cover

Putty Knife

Door Frame

R86STM

11 – 7

1. Door latch heads smoothly catch latch hook through latch holes

and that latch head goes through centre 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 micro-

wave survey meter (Refer to Microwave Measurement Procedure.).

NOTE: The door on a microwave oven is designed to act as an elec-

tronic seal preventing the leakage of 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.

           Figure C-9. Door Replacement

Pin

PIN

Lower
Oven Hinge

Upper
Oven Hinge

Lower
Oven
Hinge

Choke Cover

Slit Choke

Door Panel

Door Frame
Assembly