Sharp R820jsf Service Manual

							R-820JS
29
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
The Control unit PWB of this model employs lead-free solder. This is indicated by the LF symbol printed on the PWB
and in the service manual. The suffix letter indicates the alloy type of the solder.
Example:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When repairing a PWB with the LF symbol, only lead-free solder 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 good 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 temperature or turn off the iron when it is not required.
Leaving different types of solder on the bit 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, care should be taken to clean the bit thoroughly after each use.
Sn-Ag-Cu 
						

							R-820JS
30
To remove the outer case, proceed as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3.Remove the two (2) screws holding the back plate to the
oven cavity rear plate.
4. Remove the back plate with the sub back plate.
5.Remove the two (2) screws from the lower portion of therear cabinet using a T20H Torx type or GTXH20-100
screw driver.
6. Remove the remaining three (3) screws from rear and
along the side edge of case.
7.Slide the entire case back about 3cm to free it from
retaining clips on the cavity face plate.
8. Lift the entire case from the oven.
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 VOLTAGE:
OUTER CASE REMOVAL
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
To prevent an electric shock, take the following pre-
cautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3)Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer,
grill heater, bottom heater and Oven cavity.
WARNING FOR WIRING
1. Disconnect the power supply cord.
2.Make sure that a definite click can be heard when the
microwave oven door is unlatched. (Hold the door in a
closed position with one hand, then push the door open
button with the other, this causes the latch leads to rise,
it is then possible to hear a click as the door switches
operate.)
3.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
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.
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, Switch lever, Open
button.
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.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures: 
						

							R-820JS
31
POWER TRANSFORMER REMOVAL
6.Disconnect the main wire harness from the power
transformer.
7. Remove the two (2) screws  holding the transformer to
base plate.
8. Remove the transformer.
9. Now the power transformer is free. 1.Disconnect the power supply cord and then 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 voltage capacitor and the magnetron.
5.Disconnect the H.V. wire B from the power transformer. 9.Discharge the H.V. capacitor before carrying out any
further work.
10.Do not operate the oven with the outer case removed.
CAUTION: 1. DISCONNECT OVEN FROM POWER SUP
PLY BEFORE REMOVING OUTER CASE.
2.DISCHARGE THE HIGH VOLTAGE CA-
PACITOR BEFORE TOUCHING ANY OVEN
COMPONENTS OR WIRING.
NOTE:When replacing the outer case, the 2 special
Torx screws must be reinstalled in the same
locations.
HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL
To remove the components, proceed as follows.
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.Disconnect H.V. wire of the high voltage rectifier assembly
from the magnetron.
5.Disconnect all the leads and terminals of high voltage
rectifier assembly from the high voltage capacitor.
6.Remove one (1) screw holding earth side terminal of the
high voltage rectifier assembly.7.Now, the high voltage rectifier assembly should be free.
8. Remove one (1) screw holding capacitor holder to the
oven cavity rear plate.
9. Release the capacitor holder from the fan duct.
10.Remove the capacitor from the capacitor holder.
11.Now, the capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH
VOLTAGE RECTIFIER MUST BE SECURED
FIRMLY WITH A GROUNDING SCREW.
1.Disconnect the power supply cord and remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4.Release the tabs of air intake duct from the chassis
support and the oven cavity.
5.Disconnect the high voltage wire of the high voltage
rectifier assembly and filament lead of the transformer
from the magnetron.
6. Remove the one (1) screw holding the chassis support
to the magnetron.
MAGNETRON REMOVAL
7. Move the air intake duct to the left.
8. Carefully remove four (4) screws holding magnetron to
waveguide, when removing the screws hold the
magnetron to prevent it from falling.
9.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.
CONTROL PANEL ASSEMBLY
1.
Disconnect the power supply cord and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
CONTROL PANEL ASSEMBLY REMOVAL
4.Disconnect the main wire harness, thermistor harness and
the switch harness from the power unit.
5.Straighten the tab of the oven cavity front flange holding
the tab of the control panel frame.
6.Remove the one (1) screw holding the conrol panel
Back Plate Outer Case Cabinet
Sub Back Plate
Special 
screw
Screw Driver
(Type: TORX T20 H or 
GTXH20-100) 
						

							R-820JS
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COOLING FAN MOTOR REMOVAL POSITIVE LOCK
®  CONNECTOR (NO-CASE TYPE) REMOVAL
Figure C-2.  Positive lock® connector 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. Push the lever of positive lock
® connector.
5. Pull down on the positive lock® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK
®
CONNECTORS TO THE TERMINALS, IN-
STALL THE POSITIVE LOCK® SO THAT THE
LEVER FACES YOU. 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. Lift up the oven lamp socket from air intake duct.
5.Pull the wire leads from the oven lamp socket by  pushing
the terminal hole of the oven lamp socket with the small
flat type screw driver.
6. Now, the oven lamp socket is free.
OVEN LAMP AND LAMP SOCKET REMOVAL
Figure C-1. Oven lamp socket
TURNTABLE MOTOR REMOVAL
1. Disconnect the power supply cord.
2.Remove the turntable motor cover by snipping of material
in four corners.
3. Where the corners have been snipped off, bend corner
areas flat. No sharp edge must be evident after removal
of turntable motor cover.
4. Disconnect the wire leads from the turntable motor andremove the two (2) screws holding the turntable motor.
5. Now, the turntable motor is free.
6. After replacement use  the one (1) screw provided with
the turntable motor assembly to fit turntable motor cover.
NOTE: The one (1) screw to fit the turntable motor cover
should be XHPSD40P12K00, XHPSD40P10K00 or
XHPSD40P08K000. frame to the oven cavity front plate.
7.Lift up the control panel assembly.
8.Now, the control panel assembly is free.
CONTROL UNIT
9.
Disconnect the flat ribbon cable from the connector CN-G.
10.Remove the four (4) screws holding the control unit to the
control panel frame.
11.Release the two (2) tabs of the control panel frame
holding the CPU unit of the control unit to the control
panel frame.
12.Release the four (4) tabs of the control panel frameholding the power unit of the control unit to the control
panel frame.
13.Now, the control unit is free.
NOTE: 1.Before attaching a new key unit, wipe off  remaining
adhesive on the control panel frame surfaces
completely 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.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flat type small
screw driver
Terminal
Push
Pull down1
2
Lever Positive lock®
connector
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. 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. 
						

							R-820JS
33
9.Remove the fan blade from the fan motor shaft according
to the following procedure.
10.Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
CAUTION:
*Make sure that no metal pieces enter the gap
between the rotor and the stator of the fan motor
because the rotor is easily shaven by pliers and
metal pieces may be produced.
*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 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 reuse 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.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
installation.
*Make sure that the axis of the shaft is not slanted.
5. Install the fan duct to the oven cavity 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.
Side View Rear View
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. Now, the back plate with the sub back plate should be
removed.
5. Disconnect the wire leads from the convection motor.
6. Remove the two  (2) screws  holding the conv. thermal
cover to the oven cavity rear plate.
7.Remove the four (4) screws holding the convection
duct to the oven cavity rear plate.
8.Remove the convection duct assembly from the oven
cavity rear plate.
9.Remove the one (1) nut and the two  (2) washers  holding
the convection fan to the convection motor shaft.
10.Remove the convection fan.
CONVECTION MOTOR REMOVAL
11.Remove the three  (3) screws  holding the convection
duct to the conv. thermal cover.
12.Remove the convection duct with the conv. air angles
from the conv. thermal cover.
13.Remove the thermal insulation.
14.Remove the one  (1) pipe  holding the cooling fan to the
convection motor shaft.
15.Remove the cooling fan and the one  (1) washer from the
convection motor shaft.
16.Remove the two (2) screws holding the convection motor
to the conv. thermal cover.
17.Remove the convection motor from the conv. thermal
cover.
18.Remove the one  (1) ring from the convection motor
shaft.
19.Now, the convection motor is free.
Gap
Rotor Bracket StatorGroove joint pliers
Coil
Shaft
Axis
Stator
Rotor
These are the positions 
that should be pinched 
with pliers.
Shaft
Table
Center of
bracket
THERMISTOR 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. Now, the back plate with the sub back plate should be
removed.
5. Disconnect the connector CN-D from the control unit.
6.Remove the one  (1) screw holding the air duct to the 
						

							R-820JS
34
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUST\
MENT
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVA\
L
oven cavity rear plate.
7. Remove the air duct with the air guide cover and the
partition plate from the oven cavity rear plate.
8. Remove the one  (1) screw holding the thermistor angle
to the oven cavity rear plate. 9.
Remove the thermistor angle together with thermistor
from the oven.
10. Straighten the tab of the thermistor angle holding the
thermistor to the thermistor angle.
11.Remove the thermistor from the thermistor angle
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 rear plate.
5. Disconnect the leads of the power supply cord from the main wire harness.
6. Release the power supply cord from the oven cavity rear
plate.
7. 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 rear plate,
referring to the Figure C-3.
2. Install the earth wire lead of power supply cord to the
POWER SUPPLY CORD REPLACEMENT
Figure C-3. Power Supply Cord Replacement
cavity rear plate with one (1) screw and tighten the screw.
3.Connect the brown and blue wire leads of power supply
cord to the main wire harness correctly, referring to the
Pictorial Diagram.
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 exhaust duct to the oven cavity.
5. Remove the exhaust duct from the oven cavity.
6. Disconnect the wire leads from the grill heaters.
7. Lay down the two (2) tabs holding the reflector to the
GRILL HEATER (TOP HEATER) REMOVAL
oven cavity.
8. Remove the  reflector from the oven cavity by sliding it
leftward.
9. Remove the grill heaters and the short terminal together
from the oven cavity top plate.
10. Remove the two (2) screws holding the short terminal to
the grill heaters.
11.Now the individual grill heaters are free.
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 control panel assembly referring to
CONTROL PANEL ASSEMBLY REMOVAL.
5. Disconnect the leads from all switches.
6. Remove the two (2) screws holding the latch hook to the
oven cavity.
7. Remove the latch hook.
8. Push the retaining tab slightly and remove the switch.
Tab Tab
Tab
Secondary
Interlock
Switch Door
Sensing
Switch
Monitor Switch Latch Hook
Power
Supply Cord
Moulding
Cord Stopper
Oven Cavity
Rear Plate
Square Hole
Figure C-4. Switches
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 
						

							R-820JS
35
REMOVAL
1. Disconnect the power supply cord.
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-6 to free engaging parts.
4.Pry the principles of the lever and lift up 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.
Figure C-6. Door Disassembly
7.Release two (2) pins of door panel from two (2) holes of
upper and lower oven hinges by lifting up.
8. Now, door sub assembly is free from oven cavity.
9.Remove the four (4) screws holding the door panel to the
door frame.
10.Release door panel from seven (7) tabs of door frame by
sliding door panel downward.
11.Now, door panel is free.
DOOR REPLACEMENT
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
latch hook should be adjusted so that the door sensing
switch and secondary interlock switch are activated with
the door closed. The horizontal 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 position.
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 survey meter.
(Refer to Microwave Measurement Procedure.)
Figure C-5. Latch Switch Adjustments
12.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
13.Now, latch head and latch spring are free.
14.Remove the two (2) screws holding the glass stopper to
the door frame.
15.Remove the glass stopper from the door frame.
16.Slide the front door glass left and then slide upwards to
release the tabs holding it.
17.Now, the front door glass is free
RE-INSTALL
1.Re-install the front door glass to the door frame as
follows.
1-1. Insert the lower edge of the front door glass into the six
(6) tabs of the door frame.
1-2. Slide the front door glass upwards and insert the upper
edge of the front door glass into the five (5) tabs of the
door frame.
1-3. Slide the front door glass right and insert the right edge
of the front door glass into the two (2) tabs of the door
frame.
2.Re-install the glass stopper to the door frame as follows.
2-1.Re-install the glass stopper to the door frame so that the
two (2) holes of the glass stopper meet the two (2) pins
of the door frame.
2-2.Hold the glass stopper to the door frame with the two (2)
screws.
3.Re-install the latch spring to the latch head. Re-install the
latch spring to the door frame. Re-install latch head to
door frame.
4. Re-install door panel to door frame by fitting seven (7)
tabs of door frame to seven (7) holes of door panel.
Latch Hook
Door
Sensing 
Switch
Monitor
Switch
Secondary
Interlock
Switch Switch
Lever Latch
Heads
Door
Putty Knife
Door Frame Choke Cover 
						

							R-820JS
36
5.Hold the door panel to the door frame with four (4)
screws.
6.Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
7. Re-install choke cover  to door panel by pushing.
Note: After any service to the door;
(A)Make sure that door sensing switch and secondary
interlock switch are operating properly. (Refer to
chapter Test Procedures.).
(B)An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards. (Refer to
Microwave Measurement Procedure.)
After any service, make sure of the following :
1.Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center 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 microwave 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 (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 in themselves indicate a leakage
of microwave energy from oven cavity.
Figure C-7. Door Replacement
Upper Oven
Hinge Upper 
Oven
Hinge
Lower 
Oven
HingeLower 
Oven
Hinge
Pin
Pin
Choke Cover Door
Panel 
						

							R-820JS
37
6
45
1 2
3
6
45
1 2
3
A
B
C
D
E
F G
H A
B
C
D
E
F G
H
Figure S-1. Pictorial Diagram
REDREDWHT
WHT
WHT
THERMAL 
CUT-OUT
(OVEN) OVEN LAMP 
& SOCKET
THERMAL
CUT-OUT
125 °C(MAG.)
FAN MOTOR
CONVECTION
MOTOR
WHTBLK 
GRYREDBRNWHT
HIGH VOLTAGE COMPONENTS
MAGNETRON
H.V.WIRE A
H.V. 
CAPACITOR
H.V.
RECTIFIER H.V. WIRE B
 POWER
 TRANSFORMER
GRN
WHT
BLK
WHT
BLK
POWER SUPPLY
CORD
WHT
COMWHTWHTRED
WHT
N.C.
N.O.
COM.
GRILL HEATER THERMISTOR
BOTTOM HEATER 
GRY
ORGREDWHT
CN-B
1
1
1
1 18
1
3
2 CN-BCN-D
SP1
T1
15
RY6
RY2
RY4RY3
WHT
CONTROL PANEL
WHT
WHTWHT
BLK
WHTWHT
BLK
TURNTABLE
MOTOR
MONITOR
SWITCH
GRYWHT
2
3
4
5
1
ORGRED
GRY2
1GRN GRY
CN-A
CN-A
RY5
CN-D
CN-CCN-C
CN-G
ORG
ORG
ORG
BRN
NEUTRAL HOT EARTH
RY1
BLK
GRNGRY
N.O.
COM.
DOOR SENSING SWITCH
SECONDARY 
INTERLOCK
SWITCH
REDREDBRNORG
BRNBLK
ORG
BLK
ORG
BLK
FUSE &
HOLDER
PRIMARY
INTERLOCK
RELAY
2 3
1 BLK BLK
NOTE:Hot (RED) wire must be 
connected to the terminal 
with blue mark on the 
oven light socket.
NOTE:
The neutral (WHT) wire must be 
connected to the terminal with N 
mark on the power    supply cord.
BLUE MARK 
						

							R-820JS
38
Figure S-2. Power Unit Circuit
6
45
12
3
6
45
12
3 A
B
C
D
E
F
G
HA
B
C
D
E
F
G
H
A1
C2
C3
C4
C5
COM
CN-A
FAN
MOTOR
B.HEATERCONV.
DOOR 
SENSING
SWITCH.
VRS1
10G471KT1
A155DR
1N4002x4D1 -- D4
C2
470uF/50V D10RY4
CN-C
GND
VC
INT BUZZER
FM
OL
TTM
DOOR SW.
(J1)
C6
C1
0.1uF/50V
R2
510  1/2WR3
510  1/2W
C4
10uF/35VC3
0.1uF/50V
R4
27
D5 D6
Q2
2SB1238
C10
Q3
KRC243MC14B.HEATER
C1VA
C9
VR
LED
NO
COM
D9 RY3
NO
COM
D8 RY2
A3
D12RY5
A5
D7RY1
NO
COM
D11 RY6
B1B2D1D3
C8
C7
C17
C16
C12
C15
OVEN TH.
OL TTM
NO
MICRO T.HEATER
4
6
CONV.
C11
C13
NC
T.HEATER
NC
MICRO
OVEN TH.
OJ-SH-124
OMIF-S-124LMOJ-SH-124
OMIF-S-124LM
OMIF-S-124LM
OMIF-S-124LM
AC120V
60Hz
AC
AC8
1D1
D2 D3
D4
R5
4.7K
SP1
R6  3.3K
C5
10uF/35V
NOTE: B3P5-VH-B
CN-D
0-316879-1CN-B
B2P-VH-B
C18NC
9pin HARNESS
 x 2
:IF NOT SPECIFIED 1/4W +/- 5%
:IF NOT SPECIFIED 1SS270A+
_+
_
+
_