R-765M (serv.man9). Component replacement and adjustment procedure - Sharp Home Appliance Service Manual (repair manual)

R-765M - 20

9. Lift the entire case from the oven.
10.Discharge the H.V. capacitor before carrying out any

further work.

11.Do not operate the oven with the outer case removed.
N.B.; Step 1, 2 and 10 form the basis of the 3D checks.

CAUTION: DISCHARGE HIGH VOLTAGE CAPACI-

TOR BEFORE TOUCHING ANY OVEN
COMPONENT OR WIRING.

CAUTION: WHEN THE OUTER CASE CABINET IS

RE-INSTALLED, INSTALL IT BEFORE THE
REAR AIR ANGLE, AIR DUCT AND BACK
PLATE ARE INSTALLED, OR THE OUTER
CASE CABINET WILL BE DEFORMED.

1. Disconnect oven from power supply.

2. Visually check the door and cavity face plate for dam-

age (dents, cracks, signs of arcing etc.).

Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.

6. There are defective  parts in the microwave generating

and transmission assembly.

7. There is visible damage to the oven.

Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
Please refer to ‘OVEN PARTS, CABINET PARTS, CON-
TROL PANEL PARTS, DOOR PARTS’, when carrying out

any of the following removal procedures:

To prevent an electric shock, take the following
manners.
1. Before wiring,

1) Disconnect the power supply.
2) Open the door and wedge the door open.
3) Discharge the high voltage capacitor and wait for

60 seconds.

2. Don't let the wire leads touch to the following parts;

1) High voltage parts:

Magnetron, High voltage transformer, High volt-
age capacitor and High voltage rectifier assembly.

2) Hot parts:

Grill heating element, Oven lamp, Magnetron,

High voltage transformer and Oven cavity.

3) Sharp edge:

Bottom plate, Oven cavity, Weveguide flange,
Chassis support and other metallic plate.

4) Movable parts (to prevent a fault)

Fan blade, Fan motor, Switch and Turntable
motor.

3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector certainly until its pin

is locked. And make sure that the wire leads should
not  come off even if the wire leads is pulled.

5. To prevent an error function, connect the wire leads

correctly, referring to the Pictorial Diagram.

4. Remove one (1) screw holding fan duct to the oven

cavity rear plate.

5. Remove one (1) screw holding capacitor holder to the

oven cavity rear plate.

6. Release the capacitor holder from the fan duct.
7. Remove the high voltage capacitor from the capacitor

To remove the outer case proceed as follows.
1. Disconnect oven from power supply.
2. Open the oven door and wedge it open.
3. Remove the one (1) screw holding the back plate to the

oven cavity rear plate. Remove the back plate.

4. Remove the one (1) screw holding the air duct assem-

bly to the oven cavity rear plate.

5. Remove the air duct assembly
6. Remove the two (2) screws holding the rear air angle

to the outer case cabinet.

7. Remove the six (6) screws from rear and along the side

edge of case.

8. Slide the entire case back about 3 cm to free it from

retaining clips on the cavity face plate.

To remove the components, proceed as follows.

1. CARRY OUT 3D CHECKS.
2. Disconnect the filament lead and high voltage wire of

the high voltage transformer and the high voltage wire
B from the high voltage capacitor.

3. Remove one (1) screw holding earth side terminal of

the high voltage rectifier assembly.

R-765M - 21

1. CARRY OUT 3D CHECKS.

2. Disconnect the filament leads and high voltage wire of

high voltage transformer from high voltage capacitor
and the magnetron.

3. Disconnect the main wire harness from the high volt-

age transformer.

4. Remove the two (2) screws and one (1) washer holding

the transformer to the base plate.

5. Remove the transformer.
6. Now the high voltage transformer is free.

1. CARRY OUT 3D CHECKS.
2. Disconnect the H.V. wire B and filament lead of the

transformer from the magnetron.

3. Remove the one (1) screw holding the chassis support

to the magnetron.

4. Move the air intake duct to left.
5. Carefully remove the screws holding the magnetron to

the waveguide, when removing the screws hold the
magnetron to prevent it from falling.

6. Remove the magnetron from the waveguide with care

so the magnetron antenna is not hit by any metal object
around the antenna.

CAUTION: WHEN REPLACING THE MAGNETRON,

BE SURE THE R.F. GASKET IS IN PLACE
AND THE MAGNETRON MOUNTING
SCREWS ARE TIGHTENED SECURELY.

key fixing frame, adjust the lower edge and right edge
of the key unit (FPC membrane) to the correct position
of key fixing frame.

3. Stick the key unit (FPC membrane) firmly to the key

fixing frame by rubbing with soft cloth not to scratch.

4. After attaching the FPC membrane, attach the graphic

sheet to the FPC membrane. And adjust the lower
edge and rifgt edge of the graphic sheet to the correct
position of the key fixing frame.

2. Disconnect the wire leads and the connectors from the

control unit.

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

Now the control panel assembly is free.

NOTE:
1. Before attaching a new key unit (FPC membrane),

wipe off  remaining adhesive on the key fixing frame
surfaces completely with a soft cloth soaked in alcohol.

2. When attaching the key unit (FPC membrane) to the

1. CARRY OUT 3D CHECKS.

1. CARRY OUT 3D CHECKS.

2. Push the lever of positive lock

®

 connector.

3. Pull down on the positive lock

®

 connector.

CAUTION: WHEN YOU (SERVICE ENGINEER) CON-

NECT THE POSITIVE LOCK

®

  CONNEC-

TORS TO THE TERMINALS, CONNECT
THE POSITIVE LOCK

®

  SO THAT THE LE-

VER FACES YOU.

holder.

8. Disconnect the high voltage rectifier assembly from

the high voltage capacitor.

9. Now, the high voltage rectifier assembly and the high

voltage capacitor should be free.

CAUTION: WHEN REPLACING HIGH VOLTAGE

RECTIFIER ASSEMBLY, ENSURE THAT
THE CATHODE (EARTH) CONNECTION
IS SECURELY FIXED TO THE CAPACI-
TOR HOLDER WITH AN EARTHING
SCREW.

2. Remove the one (1) screw holding the noise filter to the

chassis support.

3. Release the noise filter from the tabs of the fan duct.
4. Remove the two (2) screws holding the chassis sup-

port to the oven cavity front flange and the magnetron.

5. Remove the chassis support from the oven cavity.
6. Disconnect the wire leads from the fan motor.
7. Remove the one (1) screw holding the capacitor holder

to the oven cavity back plate.

8. Remove the one (1) screw holding the fan duct to the

oven cavity back plate.

1. CARRY OUT 3D CHECKS.

9. Release the tabs of the capacitor holder from the fan

duct.

10.Remove the fan duct from the oven.
11.Remove the fan blade from the fan motor shaft accord-

ing to the following procedure.
1) Hold the edge of the rotor of the fan motor by using

a pair of groove joint pliers.

Terminal

Push

Pull down

1

2

Lever

Positive lock®

connector

R-765M - 22

2) Remove the fan blade assembly from the shaft of

the fan motor by pulling and rotating the fan blade
with your hand.

3) Now, the fan blade is free.

12.Remove the two (2) screws holding the fan motor to the

fan duct.

13.Now, the fan motor is free.

1. Install the the fan motor to the fan duct with the two (2)

screws.

2. Install the fan blade to the fan motor shaft according to

the following procedure.

1)

Hold the centre of the bracket which supports the
shaft of the fan motor on a flat table.

2)

Apply the screw lock tight into the hole  (for shaft) of

the fan blade.

3)

Install the fan blade to the shaft of fan motor by
pushing the fan blade with a small, light weight, ball
peen hammer or rubber mallet.

3. Insert the tabs of the capacitor holder to the fan duct.
4. Install the fan duct to the oven cavity back plate with the

one (1) screw.

5. Install the capacitor holder to the oven cavity back plate

with the one (1) screw.

6. Re-install the chassis support to the oven cavity and

the magnetron with the two (2) screws.

7. Install the noise filter to the fan duct and the chassis

support with the one (1) screw.

8. Re-connect the wire leads to the fan motor.
Rear view

Removal
1. Disconnect the oven from the power supply.
2. Remove the turntable from the oven cavity.
3. Turn the oven over.
4. Cut the four (4) bridges holding the turntable motor

cover to the base plate with cutting pliers as shown in
Figure C-2(a).

CAUTION:
WHERE THE CORNERS HAVE BEEN SNIPPED OFF
BEND CORNER AREAS FLAT. NO SHARP EDGE MUST
BE EVIDENT AFTER REMOVAL OF TT MOTOR COVER.
DO NOT DROP THE TURNTABLE MOTOR COVER
INTO THE OVEN AFTER CUTTING THE BRIDGES.
BECAUSE IT WILL DAMAGE THE WIRE LEADS OF THE
MOTOR AND IT IS DIFFICULT TO REMOVE IT OUT OF
THE OVEN.
5. Remove the turntable motor cover from the base plate.
6. Disconnect the wire leads from the turntable motor.
7. Remove the one (1) screw holding the turntable motor

to the turntable motor angle.

8. Remove the turntable motor from the turntable motor

angle. Now, the turntable motor is free.

Gap

Rotor

Bracket

Stator

Groove joint pliers

Coil

Shaft

Axis

Stator

Rotor

These are the positions 
that should be pinched 
with pliers.

Shaft

Table

Center of
bracket

Cutting pliers

Bridges

Bridges

Turntable motor 
cover

Screw; 
LX-EZA045WRE0 

Turntable motor cover

Base plate  

Tabs 

Slits 

Re-install
1. Remove the any sharp edges on the turntable motor

cover and the base plate with the cutting pliers.

2. Re-install turntable motor by locating shaft onto turnta-

ble motoor shaft to the turntable motoor angle with the
one (1) screw.

3. Re-connect the wire leads to the turntable motor.
4. Insert the two (2) tabs of the turntable motor cover into

the slits of the base plate as shown in Figure C-2(b).

5. Re-install the turntable motor cover to the base plate

with the screw (LX-EZA045WRE0) as shown in Figure
C-2(b).

R-765M - 23

Lock

Bulb

Power supply cord

Green/ Yellow
wire

Brown wire

Oven cavity back plate 

Blue wire

Noise filter

Screw

L

TP

F F2

TL

RED

F1

WHT

N

POWER
SUPPLY CORD

MOULDING
CORD STOPPER

OVEN CAVITY
BACK PLATE

SQUARE HOLE

Packing

T.T.M. support
angle

Coupling

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.
4. Now, the oven lamp is free.

1. CARRY OUT 3D CHECKS.
2. Remove the one (1) screw holding the green/yellow

wire to the cavity 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.

1. Remove the turntable motor, refer to "Turntable Motor

Removal".

2. Pull the coupling out of the hole in the oven cavity.
3. At that time the turntable coupling will be free.

CAUTION: REPLACE THE PACKING AT THE SAME

TIME WHEN REPLACE THE COUPLING.
BECAUSE THE PACKING MAY BE DAM-
AGED WHEN PULLING OUT THE COU-
PLING.

1. Insert the moulding cord stopper of power supply cord

into the square hole of the power angle, 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.

1. CARRY OUT 3D CHECKS.
2. Remove the one (1) screw holding the exhaust duct to

the oven cavity.

3. Remove the exhaust duct from the oven cavity.
4. Remove the two (2) screws holding the two (2) termi-

nals of the main wire harness to the grill heating
element.

5. Remove the two (2) screws holding the two (2) grill

heater angles to the top of the oven cavity.

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

cavity.

7. Remove the grill heating element from the top of the

oven cavity.

8. Now the grill heating element is free.