Sharp R21lcf Service Manual

							
R21LCF
10 – 1
R21LCFService Manual CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE SOLDER
[1] Employing lead-free solder
The Main PWB of this model employs lead-free solder. This is indicated by the LF symbol printed on the PWB and in the servi ce manual. The suf-
fix letter indicates the alloy type of the solder.
Example:
[2] Using lead-free wire solder
When repairing a PWB with the LF symbol, only lead-free sol der should be used. (Using normal tin/lead alloy solder may result  in cold soldered
joints and damage to printed patterns.)
As the melting point of lead- free solder is approximately 40 °C higher than tin/lead alloy solder, it is  recommend that a dedicated bit is used, and that
the iron temperature is adjusted accordingly.
[3] Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is higher  and has poorer wettability, (flow), to prevent damage to the land  of the PWB, extreme
care should be taken not to leave the bit in contact with the  PWB for an extended period of time. Remove the bit as soon as a g ood flow is achieved.
The high content of tin in lead free solder  will cause premature corrosion of the bit. To reduce wear on the bit, reduce the te mperature or turn off the
iron when it is not required. 
Leaving different types of solder on the bi t will cause contamination of the different  alloys, which will alter their characteristics, making good soldering
more difficult. It will be necessary to clean  and replace bits more often when using  lead-free solder. To reduce bit wear, car e should be taken to clean
the bit thoroughly after each use.
Indicates lead-free solder of tin, silver and copper 
						

							
R21LCF
11  –  1
R21LCFService Manual CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCE-
DURE
[1] WARNING
Please refer to “OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS,  DOOR PARTS”, when carrying out any of the following removal proce-
dures:
[2] OUTER CASE REMOVAL
To remove the outer case, procedure as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the five (5) screws from rear and along the side edge of
case.
4. Slide the entire case back about 3cm to free it from retaining clips on the cavity face plate. 5. Lift entire outer case from the unit.
6. Discharge the H.V. capacitor before carrying out any further work.
7. Do not operate the oven with the outer case removed.
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE
REMOVING OUTER CASE.
DISCHARGE THE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.
[3] POWER TRANSFORMER REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor. 4. Disconnect the filament leads of 
power transformer from high volt-
age capacitor and the magnetron.
5. Disconnect the H.V. wire from the power transformer.
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result
in severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
WARNING:Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
WARNING AGAINST HIGH VO LTAG E :
1. Disconnect the power supply cord.
2. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before operat- ing 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.
To prevent an electric shock, take the following precau-
tions.
1. Before wiring, 1) Disconnect the power supply cord.
2) Open the door block it 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 voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, Power transformer and Oven
cavity.
WARNING FOR WIRING
3) Sharp edge:Bottom plate, Oven cavity, Waveguide flange Chassis
supportand other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever, and Antenna
motor
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked and
make sure that the wire leads do 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. 
						

							
R21LCF
11  –  2
6. Disconnect the main wire harness from the power transformer.
7. Remove the two (2) screws and two (2) VCP caps holding thetransformer to base plate. 8. Remove the transformer.
9. Now the power transformer is free.
[4] HIGH VOLTAGE RECTIFIER ASSEMBLY
 AND HIGH VOLTAGE CAPACITOR REMOVAL
To remove the components, proceed as follows.
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect H.V. wire of the high voltage rectifier assembly from the
magnetron and the power transformer.
5. Disconnect the filament lead of the power transformer from the high voltage capacitor.
6. Remove one (1) screw holding earth side terminal of the high volt- age rectifier assembly.
7. Disconnect all the leads and terminals of high voltage rectifier assembly from the high voltage capacitor. 8. Now, the high voltage rectifier assembly should be free.
9. Remove one (1) screw holding the capacitor holder to the oven
cavity rear plate.
10.Remove one (1) screw holding the fan duct to the oven cavity rear plate.
11. Release the capacitor holder from the fan duct.
12.Remove the capacitor from the capacitor holder.
13.Now, the capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMI-
NAL OF THE HIGH VOLT AGE RECTIFIER MUST BE
SECURED FIRMLY WITH A GROUNDING SCREW.
[5] MAGNETRON REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the high voltage wire of the high voltage rectifier assembly and filament lead of the transformer from the magnetron.
5. Remove the one (1) screw holding the airguide to the magnetron and remove the airguide.
6. Remove the one (1) screw holding the insertion plate A to the mag- netron and remove the insertion plate A.
7. Remove the one (1) screw holding the chassis support to the mag- netron. 8. Release the tabs of air intake duct from the chassis support and the
oven cavity.
9. Move the air intake duct to the left.
10.Carefully remove four (4) screws holding magnetron to waveguide, when removing the screws hold the magnetron to prevent it from
falling.
11. Remove the magnetron from the waveguide with care so the mag- netron antenna is not hit by any metal object around the antenna.
CAUTION: WHEN REPLACING TH E MAGNETRON, BE SURE THE
R.F. GASKET IS IN PLACE AND THE MAGNETRON
MOUNTING SCREWS ARE TIGHTENED SECURELY.
[6] CONTROL PANEL ASSEMBLY REMOVAL
CONTROL PANEL ASSEMBLY
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the main wire harness from the control unit.
5. Remove the one (1) screw holding the control panel assembly to the oven cavity front plate.
6. Lift up the control panel assembly.
7. Now, the control panel assembly is free.
CONTROL UNIT
8. Remove the five (5) screws holding the control unit to the control panel frame.
9. Remove the control unit from the control panel frame. 10.Now, the control unit is free.
TIMER KNOB
11. After removing the control unit, remove the ring holding the timer
knob to the control panel.
12.Release the tab of the timer knob from the hole of the control panel.
13.Now, the timer knob is free.
NOTE: 1) Before attaching a new timer sheet, wipe off remaining adhesive on the control panel frame surfaces completely
with a soft cloth soaked in alcohol.
2) When attaching the timer sheet to the control panel frame, adjust the upper edge and right edge of the timer sheet to
the correct position of control panel frame.
3) Stick the timer sheet firmly to the control panel frame by rubbing with a soft cloth so not to cause scratches.
[7] OVEN LAMP AND  LAMP SOCKET REMOVAL
1. Disconnect the power supply cord, and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Lift up the oven lamp socket from air intake duct.
5. Pull the wire leads from the oven lamp socket by pushing the termi-
nal hole of the oven lamp socket  with the small flat type screw
driver.
6. Now, the oven lamp socket is free.
Oven lamp socket
Terminal
Wire lead
Terminal hole
Flat type small screw driver 
						

							
R21LCF
11  –  3
                    Figure C-1. Oven lamp socket
[8] POSITIVE LOCK  CONNECTOR (NO-CASE TYPE) REMOVAL
1. Disconnect the power supply cord, and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Push the lever of positive lock
® connector. 
5. Pull down on the positive lock
® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK
® CONNEC-
TORS TO THE TERMINALS, NSTALL THE POSITIVE
LOCK
® SO THAT THE LEVER FACES YOU.
                                 Figure C-1. Positive Lock
® Connector
[9] ANTENNA MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Remove the one (1) screw holding the base plate cover to the baseplate and remove the base plate cover. 3. Disconnect the wire leads from the antenna motor and remove the
one (1) screw holding the antenna motor.
4. Remove the antenna motor shaft from the antenna motor.
5. Now, the antenna motor is free.
[10] COOLING FAN MOTOR REMOVAL
1. REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor.
5. Remove the one (1) screw holding the capacitor holder to the oven cavity rear plate.
6. Remove the one (1) screw holding the fan duct to the oven cavity rear plate.
7. Release the tabs of the capacitor holder from fan duct.
8. Remove the fan duct from the oven.
9. Remove the fan blade from the fan motor shaft according to the fol- lowing procedure.
10.Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers.
CAUTION: MAKE SURE THAT AN Y PIECES DO NOT ENTER THE
GAP BETWEEN THE ROTOR AND THE STATOR OF THE
FAN MOTOR. BECAUSE THE ROTOR IS EASY TO BE
SHAVEN BY PLIERS AND METAL PIECES MAY BE PRO-
DUCED.
DO NOT TOUCH THE PLIERS TO THE COIL OF THE
FAN MOTOR BECAUSE THE COIL MAY BE CUT OR
INJURED.
DO NOT DISFIGURE THE BRACKET BY TOUCHING
WITH THE PLIERS.
11. Remove the fan blade assembly from the shaft of the fan motor by pulling and rotating the fan blade with your hand.
12.Now, the fan blade will be free. CAUTION: DO NOT RE-USE THE REMOVED FAN BLADE
BECAUSE THE HOLE (FOR SHAFT) MAY BE LARGER
THAN NORMAL.
13.Remove the two (2) screws holding the fan motor to the fan duct.
14.Now, the fan motor is free.
2. INSTALLATION
1. Install 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.
3. Hold the center of the bracket which supports the shaft of the fan motor on the flat table.
4. 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 hard when installing because the bracket may be disfigured.
MAKE SURE THAT THE FAN BLADE ROTATES
SMOOTH AFTER INSTALLED.
MAKE SURE THAT THE AXIS  OF THE SHAFT IS NOT
SLANTED.
5. Install the fan duct to the oven ca vity rear plate with the one (1)
screw.
6. Insert the tabs of the capacitor holder to the fan duct.
7. Install the capacitor holder to the oven cavity rear plate with the one (1) screw.
8. Re-connect the wire leads to the fan motor.
Terminal
Push
Pull down 1
2
Lever
Positive lock
connector
R 
						

							
R21LCF
11  –  4
[11] POWER SUPPLY CORD REPLACEMENT
1. REMOVAL
1. Disconnect the power supply cord and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the one (1) screw holding the green wire to the cavity rearplate.
5. Disconnect the wire leads of t he power supply cord from the noise
filter.
6. Release the power supply cord from the oven cavity rear plate.
7. Now, the power supply cord is free.
2. REINSTALL
1. Insert the moulding cord stopper of power supply cord into the square hole of the oven cavity rear plate, referring to the Figure C-
3b.
2. Install the earth wire lead of power supply cord to the cavity rear plate with one (1) screw and tighten the screw.
3. Connect the wire leads of power supply cord to the noise filter, referring to the Pictorial Diagram.                   Figure C-3a. Power Supply Cord Replacement
                      Figure C-3b. Power Supply Cord Replacement
[12] DOOR SENSING SWIT CH/SECONDARY INTERLOCK  SWITCH AND MONITOR SWITCH
REMOVAL
1. REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the control panel assemb ly, referring to section of CON-
TROL PANEL ASSEMBLY REMOVAL.
5. Disconnect the leads from all switches.
6. Remove the two (2) screws holding the latch hook to the oven cav- ity.
7. Remove the latch hook.
8. Push the retaining tab outward slightly and remove the switch.
                                           Figure C-4. Switches
GapRotor
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
Rear View Side View
Power Supply Cord
Chassis
Support
WHTRED
L
N
Screw Green
Wire
Noise Filter
White Wire Oven Cavity
Rear Plate
Black Wire
Power
Supply Cord
Moulding
Cord Stopper
Oven Cavity
Rear Plate
Square Hole
Latch Hook
Tabs
Tab
Tab
Tab
Tab
Secondary
Interlock
Switch
Monitor
Switch
Door
Sensing
Switch 
						

							
R21LCF
11  –  5
2. REINSTALL
1. Re-install each switch in its place. The door sensing switch and
monitor switch are in the lower position and the secondary interlock
switch is in the upper position. 2. Re-connect wire leads to each switch. Refer to pictorial diagram.
3. Secure latch hook (with two (2) 
mounting screws) to oven flange.
4. Make sure that the monitor switch is operating properly and check continuity of the monitor circui t. Refer to chapter Test Procedure
and Adjustment procedure.
[13] DOOR SENSING SWIT CH/SECONDARY INTERLOCK  SWITCH AND MONITOR SWITCH
ADJUSTMENT
1. Adjustment
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
If the door sensing switch, secondary interlock switch and monitor
switch do not operate properly due  to a misadjustment, the following
adjustment should be made.
4. Loosen the two (2) screws holding latch hook to the oven cavity front flange.
5. 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 la tch hook should be adjusted so that
the door sensing switch and secondary interlock switch are acti-
vated with the door closed. The ho rizontal position of the latch hook
should be adjusted so that the plunger of the monitor switch is
pressed with the door closed.
6. Secure the screws with washers firmly.
7. Check the operation of all switches . If each switch has not activated
with the door closed, loosen screw and adjust the latch hook posi-
tion.
2. 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 door sensing switch and secondary interlock switch interrupt the circuit before the door can be opened.
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 su rvey meter. (Refer to Micro-
wave Measurement Procedure.)
                          Figure C-5. Latch Switch Adjustments
[14] DOOR PARTS REMOVAL
1. REMOVAL
CHOKE COVER
1. Disconnect the power supply cord.
2. Open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the gapbetween the choke cover and door frame as shown in Figure C-6 to
free engaging parts.
4. Pry the choke cover by inserting a putty knife as shown in Figure C- 6.
5. Release choke cover from door panel.
6. 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.
7. Release two (2) pins of door panel from two (2) holes of upper and lower oven hinges by lifting up.
8. Remove the one (1) cushion (ferrite) from the lower opening between the door panel and the door frame.
9. Now, door sub assembly is free from oven cavity.                                Figure C-6. Door Disassembly
DOOR PANEL REMOVAL
10.Remove the four (4) screws holding the door panel to the door frame.
11. Release door panel from seven (7)  tabs of door frame by sliding
door panel downward.
12.Now, the door panel is free.
Latch Hook
Latch Switch
Lever A
Latch Switch
Lever B
Latch Switch
Lever C
Latch Head
Latch Head Handle
Lever
Door
Handle
Latch
LeverSecondary
Interlock
Switch
Monitor
Switch
Door
Sensing
Switch
Putty Knife
Door Frame
Choke Cover 
						

							
R21LCF
11  –  6
DOOR HANDLE REMOVAL
13.Release the latch spring from the tab of the latch angle assembly.
14.Remove the two (2) screws holding the door handle and the latchangle assembly through the door frame.
15.Now, door handle is free.
LATCH HEADS REMOVAL
16.Remove the one (1) screw holding the latch angle assembly to the door frame.
17.Remove the latch angle assembly together with the latch lever, latch spring and the upper and lower latch heads from the door
frame.
18.Release the latch lever together with the latch spring and the latch heads from the latch angle assembly.
19.Release the two (2) latch heads from the latch lever.
20.Now, the upper and lower latch heads are free.
FRONT DOOR GLASS OR SEALER PLATE REMOVAL
(After DOOR PANEL REMOVAL)
1) Remove the four (4) screws holding the glass stopper U to the door frame and remove the glass stopper U.
2) Remove the two (2) screws holding the glass stopper R to the door frame and remove the glass stopper R.
3) Slide the front door glass and the sealer plate left at first and then slide upwards to release them from the tabs holding it.
4) Now, the front door glass or the sealer plate free.
DOOR CASE REMOVAL
(After DOOR PANEL REMOVAL)
1) Straighten all tabs of the door case holding the door case to the door frame.
2) Release door case from the door frame.
3) Now, the door case is free
NOTE: At this moment, the door badge is attached on the door case.
2. REINSTALL OF THE DOOR
1. Reinstall all door parts except the choke cover
2. Catch two (2) pins of door panel on two (2) holes of upper and lower oven hinges.
3. Insert the one (1) cushion (ferrite) into the lower opening between the door panel and the door frame.
4. Reinstall choke cover to door panel by pushing.
NOTE: After any service to the door; 1)
Make sure that door sensing switch, secondary inter-
lock switch and monitor switch are operating properly.
(Refer to chapter “Test Procedures”.).
2) An approved microwave survey meter should be used
to assure compliance with proper microwave radiation
emission limitation standards. (Refer to chapter “Test
Procedures”.)
3. After any service, make sure of the following:
1. Door latch heads smoothly catc h latch hook through latch holes
and that latch head goes through center of latch hole.
2. Deviation of door alignment from hor izontal 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
electronic seal preventing the leakage of microwave
energy from oven cavity during cook cycle. This function
does not require that door be air-tight, moisture (conden-
sation)-tight or light-tight. Therefore, occasional appear-
ance 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-7. Door Replacement
[15] ANTENNA MOTOR  SHAFT REPLACEMENT
1. REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60 seconds.
4. Remove the antenna motor from the oven cavity bottom plate,
referring to ANTENNA MOTOR REMOVAL.
5. Remove the ceramic shelf from the oven cavity bottom plate.
6. Remove the one (1) screw and the one (1) washer holding the antenna holder of the stirrer antenna assembly to the oven cavity
bottom plate through the square hole of the stirrer antenna. Refer
to Figure C-8. 7. Release the antenna holder from the one (1) tab of the oven cavity
bottom plate.
8. Remove the stirrer antenna assembly from the oven cavity bottom plate.
9. Remove the antenna motor shaft from the hole of the oven cavity bottom plate.
10.Now, the antenna motor shaft is free.
Upper Oven
Hinge
Upper
Oven
Hinge
Lower
Oven
Hinge Lower
Oven
Hinge
Pin
Pin
Choke Cover
Cushion
(Ferrite) Slit
Chok
Door
Panel 
						

							
R21LCF
11  –  7
                            Figure C-8. Antenna Motor Shaft Removal
2. INSTALLATION
1. Install the antenna motor shaft into the hole of the oven cavity bot-tom plate, and turn the flat faces of antenna motor shaft to the left
and right side walls of oven cavity (to fit the stirrer antenna holder).
Refer to Figure C-9.
2. Set the direction of the stirrer antenna and antenna holder so that the hole of the antenna holder fit to the centre of the stirrer
antennas big blade. Refer to Figure C-9.
3. Hook the hole of the antenna holder on the tab of the oven cavity bottom plate. Refer to Figure C-10.
4. Insert the antenna holder into the hole of the oven cavity bottom plate and fit the hole of the antenna holder with an antenna motor
shaft. Refer to Figure C-10. 5.  Install the antenna holder to the oven cavity bottom plate with the
one (1) screw and the one (1) washer. Refer to Figure C-8.
6. Install the antenna motor to the oven cavity bottom plate with one (1) screw. Refer to Figure C-8. 
7. Connect the wire leads to the antenna motor, referring to the picto- rial diagram.
8.  Install the base plate cover to the base plate with one (1) screw.
9. Install the ceramic shelf to the  oven cavity bottom plate. Refer to
INSTALLATION OF CERAMIC SHELF.
Figure C-9. Derection of Antenna Motor Shaft and Stirrer Antenna  Assembly
                                                                               Figure C-10. Stirrer Antenna Assembly Installati on
[16] INSTALLATION OF CERAMIC SHELF
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Make sure that the smooth surface of the ceramic shelf face up.
4. Make sure that the rubber packing without a fin of the ceramic shelf
faces the front of the oven. NOTE: The three (3) rubber packings
 with the fins and the one (1)
rubber packing without a fin are attached to the four (4) edges
of the ceramic shelf. The one (1) rubber packing without a fin
is the front edge of the ceramic shelf.
5. Put the front edge of the ceramic shelf into the front edge of the oven cavity bottom plate.
Screw
Square
hole
Screw
Antenna motorAntenna
motor shaft
Antenna holder
Stirrer antenna
Oven cavity
bottom plate
Tab
Washer
Flat face
Flat face
To right wall
of oven cavity
To left wall of
oven cavity
Antenna
motor shaft
Antenna holder
Stirrer antenna Stirrer antenna's
big bladeCentre
Hole
Antenna holder
Stirrer antenna
Antenna holder
Stirrer antenna
Antenna
motor shaft Tab
Stirrer antenna assemblyTab
Antenna
motor shaft
Antenna
motor shaft
Oven cavity
bottom plate
Oven cavity bottom plate
Tab 
						

							
R21LCF
11  –  8
6. Push down the rear edge of the ceramic shelf into the oven cavitybottom plate.
7. Now, the ceramic shelf is installed.
WARNING: Make sure that the rubber packing is not caught
between the oven door and the oven cavity front plate,
to avoid possible exposure to excessive microwave
energy.
Rear Edge
Push
Front E dge
Ceramic
Shelf
Oven C avity 
						

							
R21LCF
12 – 1
R21LCFService Manual CHAPTER 12. CIRCUIT DIAGRAMS
[1] Pictorial Diagram (Figure S-1)
Figure S-1. Pictorial Diagram
FUSE
RED
BLK
L
N
WHT RED
WHT
WHT
OR GGR Y
THE R MAL
CUT-OUT
125û
C(OVEN)
OVE N LAMP
&SOCKET
THE R MAL
CUT-OUT
145¡ C (MAG .)
FAN MOTOR
WHT
OR G
WHTREDWHT
HIG H VOLTAG E C OMP ONE NTS
MAG NE T R O N
H.V.
CAPACITOR
H.V.
R E C T IF IE R
POWER TRANSFORMERGR N
POWER SUPPLY
CORD
COM
WHTWHT
OR G
WHTWHT
N.C . N.O.
COM.
CONNECTOR
OR GOR G
WHT
BLUBR N
ANTE NNA
MO T O R
MO NMIT O R
SWITCH
PRIMARY
INT E R LOC K
RELAY
WHTBLU
BLUREDOR G
REDOR G
OR G
2 3 4 51 YLW
PNKBLU
CN-A
RY2
RY1
NE UTR AL
HOTEARTH
PNKYLW
N.O.
COM.
DOOR S E NS ING S WITC H
SECONDARY
INT E R LOC K
SWITCH
NOTE :Hot (OR G ) wire must be
conne cte d to the te rmina l
with blue ma rk on the
oven light s ocket.
BLUE MAR KRED
BR N
RED
NOIS E
FILTE R