DOWNLOAD Sharp R-757M (serv.man10) Service Manual ↓ Size: 82.86 KB | Pages: 6 in PDF or view online for FREE

Model
R-757M (serv.man10)
Pages
6
Size
82.86 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Component replacement and adjustment procedure
File
r-757m-sm10.pdf
Date

Sharp R-757M (serv.man10) Service Manual ▷ View online

R-757M - 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.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below
before operating the oven.
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 is 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, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any
of the following removal procedures:
WARNING FOR WIRING
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 plates.
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 fully until its pin is
locked. And make sure that the wire leads should not
come off even if the wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
the high voltage rectifier assembly.
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.
OUTER CASE REMOVAL
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  to the
oven cavity rear plate.
5. Remove the air duct.
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.
HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
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
R-757M - 21
HIGH VOLTAGE TRANSFORMER REMOVAL
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 the left.
5. Carefully remove four(4) 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.
             MAGNETRON REMOVAL
surfaces completely with a soft cloth soaked in alcohol.
2. When attaching the key unit (FPC membrane) to the
control panel, adjust the lower edge and right edge of
the key unit (FPC membrane) to the correct position of
control panel.
3. Stick the key unit (FPC membrane) firmly to the control
panel 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 right edge of the graphic sheet to the correct
position of the control panel frame
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 unit
to the cavity.
4. 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 control panel frame
CONTROL PANEL ASSEMBLY REMOVAL
POSITIVE LOCK
®
  CONNECTOR REMOVAL
Figure C-1.  Positive lock
®
connector
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 ENGNEERS) CON-
NECT THE POSITIVE LOCK
®
  CONNEC-
TORS TO THE TERMINALS, CONNECT
THE POSITIVE LOCK
®
  SO THAT THE LE-
VER FACES YOU.
7. Remove the high voltage capacitor from the capacitor
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 are  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.
REMOVAL
1. CARRY OUT 3D CHECKS.
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
FAN MOTOR REPLACEMENT
to the oven cavity back plate.
8. Remove the one (1) screw holding the fan duct to the
oven cavity back plate.
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
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
R-757M - 22
CAUTION:
• Make sure that no swarf from the rotor enters
the gap between the rotor & stator of the fan
motor.
• Avoid touching the coil of the fan motor with
the pliers as the coil may become cut or dam-
aged.
• Avoid deforming the bracket whilst using the
pliers.
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.
CAUTION:
• Do not  reuse the removed fan blade as the
fixing hole  may be oversize.
12.Remove the two (2) screws holding the fan motor to the
fan duct.
13.Now, the fan motor is free.
INSTALLATION
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.
CAUTION:
• Do not hit the fan blade when installing be-
cause the motor bracket may be deformed.
• Make sure that the fan blade rotates smoothly
after installation.
• Make sure that the axis of the shaft is not
slanted.
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.
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).
Figure C-2(a). Turntable motor cover removal
Rear view
Side view
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.
Coil
Gap
Rotor
Bracket
Stator
Groove joint pliers
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
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
TURNTABLE MOTOR REPLACEMENT
R-757M - 23
Removal
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 oven cavity
back plate.
5. Now, the power supply cord is free.
Re-install
1. Insert the moulding cord stopper of power supply cord
into the square hole of the oven 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 tighten 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 wire leads as Positive lock
®
 connector on
page 21.
3. Lift up the oven lamp from its retaining clips.
4. Now, the oven lamp is free.
Figure C-4 (a) Replacement of Power Supply Cord
Figure C-4(b). Power Supply Cord Replacement
Figure C-3. Turntable Coupling
Lock
Socket
Bulb
POWER
SUPPLY CORD
MOULDING
CORD STOPPER
OVEN CAVITY
BACK PLATE
SQUARE HOLE
2. Re-install turntable motor by locating shaft onto turnta-
ble motor shaft to the turntable motor 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).
1. Remove the any sharp edges on the turntable motor
cover and the base plate with the cutting pliers.
TURNTABLE COUPLING REMOVAL
Packing
T.T.M. support
angle
Coupling
OVEN LAMP SOCKET REMOVAL
Re-install
Screw; 
LX-EZA045WRE0 
Turntable motor cover
Base plate  
Tabs 
Slits 
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
Figure C-5. Oven lamp
Figure C-2(b). Turntable motor cover re-install
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.
POWER SUPPLY CORD REPLACEMENT
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
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Sharp R-757M (serv.man10) Service Manual ▷ Download

  • DOWNLOAD Sharp R-757M (serv.man10) Service Manual ↓ Size: 82.86 KB | Pages: 6 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp R-757M (serv.man10) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp R-757M (serv.man10) Microwave Oven. Information contained in Sharp R-757M (serv.man10) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.