DOWNLOAD Sharp R-895M (serv.man8) Service Manual ↓ Size: 498.2 KB | Pages: 6 in PDF or view online for FREE

Model
R-895M (serv.man8)
Pages
6
Size
498.2 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Component replacement and adjustment procedure
File
r-895m-sm8.pdf
Date

Sharp R-895M (serv.man8) Service Manual ▷ View online

R-895M - 24
9. Discharge the H.V. capacitor before carrying out any
further work.
10.Do not operate the oven with the outer case removed.
N.B.; Step 1, 2 and 9 form the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPO-
NENT OR WIRING.
CAUTION: WHEN THE OUTER CASE CABINET IS RE-
INSTALLED, INSTALL IT BEFORE THE
BACK PLATE IS INSTALLED, OR THE
OUTER CASE CABINET WILL BE DE-
FORMED.
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 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, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any
of the following removal procedures:
WARNING FOR WIRING
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 two (2) screws holding the back plate to
the oven cavity rear plate. Remove the back plate
4. Remove the air duct assembly from the oven cavity
rear plate.
5. Remove the air duct assembly
6. Remove the eight (8) screws from rear and along the
side edge of case.
7. Slide the entire case back about 3 cm to free it from
retaining clips on the cavity face plate.
8. Lift the entire case from the oven.
HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
To prevent an electric shock, take the following
measures.
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 assem-
bly.
2) Hot parts:
Top heating element, Bottom heating element,
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, 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.
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect the filament lead of the high voltage trans-
former and the high voltage transformer secondary
wire  from the high voltage capacitor.
3. Disconnect the high voltage wire B from the magnetron.
4. Remove one (1) screw holding earth side terminal of
the high voltage rectifier assembly.
5. Remove one (1) screw holding fan duct to the oven
cavity rear plate.
6. Remove one (1) screw holding capacitor holder to the
oven cavity rear plate.
7. Release the capacitor holder from the fan duct.
8. Remove the high voltage capacitor from the capacitor
holder.
9. Disconnect the high voltage wire B and the high voltage
rectifier assembly from the high voltage capacitor.
10.Disconnect the high voltage rectifier assembly from the
high voltage wire B.
11.Now, the high voltage rectifier assembly and the high
voltage capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE
RETIFIER ASSEMBLY, ENSURE THAT
THE CATHODE (EARTH) CONNECTION
IS SECURELY FIXED TO THE CAPACITOR.
R-895M - 25
             MAGNETRON REMOVAL
CONTROL PANEL ASSEMBLY REMOVAL
FAN MOTOR REPLACEMENT
HIGH VOLTAGE TRANSFORMER REMOVAL
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
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.
NOTE:
1. Before attaching a new key unit, wipe off remaining
adhesive on the control panel frame surfaces com-
pletely with a soft cloth soaked in alcohol.
2. When attaching the key unit to the control panel frame,
adjust the upper edge and right edge of the key unit to
the correct position of  control panel frame.
3. Stick the key unit firmly to the control panel frame by
rubbing with soft cloth not to scratch.
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 one (1) screw holding the chassis support
to the oven cavity front flange.
5. Remove one(1) screw holding the chassis support to the
magnetron.
6. Remove the chassis support from the oven cavity.
7. Disconnect the wire leads from the fan duct.
8. Remove the one (1) screw holding the capacitor holder
to the oven cavity back plate.
9. Release the tabs of the capacitor holder from the fan
duct.
10.Remove the one (1) screw holding the fan duct to the
oven cavity back plate.
11.Remove the fan duct from the oven.
12.Remove the fan duct 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.
CAUTION:
• Make sure that no swarf from the rotor enters
the gap between the rotor & startor of the fan
motor.
• Avoid touch the coil of the fan motor with the
pliers as the coil may become cut or damaged.
• 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 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 with the
one (1) screw.
7. Re-fit the one(1) screw to secure the chassis support to
the magnetron.
8. Install the noise filter to the fan duct and the chassis
support with the one (1) screw.
9. Re-connect the wire leads to the fan motor.
1. CARRY OUT 3D CHECKS.
2. Disconnect the filament leads of high voltage trans-
former from high voltage capacitor and the magnetron.
3. Disconnect the high voltage transformer secondary
wire  from the high voltage transformer.
4. Disconnect the main wire harness from the high volt-
age transformer.
5. Remove the two (2) screws and one (1) washer holding
the transformer to the base plate.
7. Remove the transformer.
8. 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 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.
R-895M - 26
Terminal
Push
Pull down
1
2
Lever
Positive lock¤
connector
Cutting pliers
Bridges
Bridges
Turntable motor 
cover
Screw; 
LX-EZA045WRE0 
Turntable motor cover
Base plate  
Tabs 
Slits 
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
TURNTABLE MOTOR REPLACEMENT
Figure C-1(a). Turntable motor cover removal
Figure C-1(b). Turntable motor cover re-install
POSITIVE LOCK
®
  CONNECTOR REMOVAL
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 ENGINEERS) CON-
NECT THE POSITIVE LOCK
®
  CONNEC-
TORS TO THE TERMINALS, CONNECT
THE POSITIVE LOCK
®
  SO THAT THE LE-
VER FACES YOU.
Figure C-2.  Positive lock
®
connector
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
Removal
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: DO NOT DROP THE TURNTABLE MOTOR
COVER INTO THE OVEN AFTER CUTTING
THE BRIDGES. BECAUSE IT WILL DAM-
AGE 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. Bend the turntable motor retaining tab back to release
the motor.
9. Remove the turntable motor from the turntable motor
angle. Now, the turntable motor is free.
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 motor shaft to the turntable motor angle with the one
(1) screw.
3. Bend the turntable motor retaining tab forward to se-
cure the motor.
4. Re-connect the wire leads to the turntable motor.
5. Insert the two (2) tabs of the turntable motor cover into
the slits of the base plate as shown in Figure C-2(b).
6. Re-install the turntable motor cover to the base plate
with the screw (LX-EZA045WRE0) as shown in Figure
C-2(b).
R-895M - 27
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
1. CARRY OUT 3D CHECKS.
2. Remove the two(2)wires leads as Positive lock
®
connector removal above.
3. Lift up the oven lamp from its retaining clips.
4. Now, the oven lamp is free.
Figure C-3. Oven lamp
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 rear cabinet.
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 cavity backplate, 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.
POWER SUPPLY CORD REPLACEMENT
OVEN LAMP SOCKET REMOVAL
BULB
LOCK
TOP HEATING ELEMENT REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the two (2) screws holding the two (2) termi-
nals 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.
Figure C-4 (a) Replacement of Power Supply Cord
Figure C-4(b). Power Supply Cord Replacement
BOTTOM HEATING ELEMENT REMOVAL
MONITORED LATCH SWITCH,  MONITOR SWITCH AND STOP SWITCH REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the control panel assembly referring to "CON-
TROL PANEL ASSEMBLY REMOVAL".
3. Disconnect the leads from all switches.
4. Remove the two (2) screws holding the latch hook to
the oven cavity.
5. Remove the latch hook.
6. Remove the switch(es) from the latch hook by pushing
the retaining tab backwards slightly and turning the
switch(es) on the post.
7. Now the switch(es) is free.
SW2: Stop switch
SW3: Monitor switch
SW1: Monitored
latch switch
Tab
Post
Post
Figure C-5. Switches
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
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 packing to the bottom heater.
5. Remove the heater cover and the heater packing from
the bottom heating element.
6. Re-move the two(2) nuts holding the bottom heating
element to the oven cavity.
7. Remove the bottom heating element from the oven
cavity .
Page of 6
Display

Sharp R-895M (serv.man8) Service Manual ▷ Download

  • DOWNLOAD Sharp R-895M (serv.man8) Service Manual ↓ Size: 498.2 KB | Pages: 6 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp R-895M (serv.man8) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp R-895M (serv.man8) Microwave Oven. Information contained in Sharp R-895M (serv.man8) 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.