In the interest of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
GRILL
2
CONVECTION
This is a supplemental Service Manual for Model R-820BC. This model is quite similar to base model R-820BW. Use
this supplemental manual together with the Base Model Service Manual (Refer No. is S5812R820BPW/) for complete
operation, service information, etc..
TABLE OF CONTENTS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDE FRONT COVER
BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
POWER UNIT CIRCUIT ........................................................................................................................................ 5
PARTS LIST .......................................................................................................................................................... 6
PACKING AND ACCESSORIES ........................................................................................................................... 8
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and
current, contact with following parts may result in a severe,
possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
R-820BC
Page
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
Page 2
R-820BC
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures described
in this manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found
with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit
until the oven has been brought into compliance.
Page 3
WARNING TO SERVICE PERSONNEL
Don't Touch !
Danger High Voltage
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with
following parts
fatal, electrical shock.
(Example)
High Voltage Capacitor, High Voltage Power Trans-
former, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
may result in a severe, possibly
R-820BC
Before Servicing
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for 60
seconds and then short-circuit the connection of the highvoltage capacitor (that is the connecting lead of the highvoltage rectifier) against the chassis with the use of an
insulated screwdriver.
Whenever troubleshooting is performed the power supply
must be disconnected. It may in, some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event,
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 leads to the primary of the power
transformer.
5. Ensure that the leads remain isolated from other
components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed,
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. Reconnect the leads to the primary of the power
transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is
installed.
7. Run the oven and check all functions.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnect the power supply cord after the outer case is
installed.
4. Run the oven and check all functions.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup
of cold water on the oven turntable, close the door and set
the power to HIGH and set the microwave timer for two (2)
minutes. When the two minutes has elapsed (timer at zero)
carefully check that the water is now hot. If the water
remains cold carry out Before Servicing procedure and reexamine the connections to the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and microwave leakage test should be carried out.
1
Page 4
R-820BC
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.
2) Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission in
excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission
in excess of 5 mW/cm
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard
for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
2
at any point 5cm or more from the external surface of the oven.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
2
Page 5
R-820BC
SERVICE MANUAL
DOUBLE GRILL
CONVECTION
MICROWAVE OVEN
R-820BC
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service
Information for the SHARP MICROWAVE OVEN, R-820BC.
The model R-820BC is quite similar to base model R-820BW (Refer No. is S5812R820BPW/).
It is recommended that service personnel carefully study the entire text of this manual and the based model's manual so that
they will be qualified to render satisfactory customer service.
Check the interlock switches and the door seal carefully. Special attention should be given to avoid electrical shock and
microwave radiation hazard.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is no other visible damage with the oven.
Servicing and repair work must be carried out only by trained service personnel.
DANGER
Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing.
Service personnel - Do not contact the following parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage
Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “*” on parts list are used at voltages more than 250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “∆” on parts list may cause undue microwave exposure, by themselves, or when they are damaged,
loosened or removed.
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
3
Page 6
H
1
2
CN-G
CN-C
CN-C
3
4
CONTROL PANEL
BLK
RY3
SP1
2
RY6
ORG
BRN
45
RED
RY4
RED
ORG
PRIMARY
RY2
INTERLOCK
RELAY
T1
CN-A
15
ORG
ORG
BRN
6
G
CN-D
3
1
CN-B
RY1
RY5
CN-D
3
2
1 BLK
CN-B
2
GRY
1
GRN
BRN
BLK
ORG
CN-A
1
GRY
2
3
ORG
4
5
RED
BLK
F
GRILL HEATER
DOOR SENSING SWITCH
N.O.
GRY
GRN
COM.
MONITOR
SWITCH
N.C.
RED
WHT
WHT
COM
SECONDARY
INTERLOCK
SWITCH
COM.
N.O.
GRY
WHT
WHT
WHT
E
FUSE &
HOLDER
BLK
BLK
GRY
WHT
BLK
D
THERMISTOR
NOTE:
Hot (RED) wire must be
connected to the terminal
with blue mark on the
oven light socket.
BOTTOM HEATER
WHT
TURNTABLE
MOTOR
BLK
THERMAL
CUT-OUT
(OVEN)
OVEN LAMP
& SOCKET
WHT
WHT
BLK
BLUE MARK
RED
WHT
RED
C
ORG
EARTH
BLK
WHT
GRY
RED
BRN
GRN
HOT
BLK
WHT
WHT
CONVECTION
MOTOR
POWER
TRANSFORMER
B
NOTE:
The neutral (WHT) wire must be
connected to the terminal with "N"
mark on the power supply cord.
POWER SUPPLY
CORD
A
NEUTRAL
WHT
WHT
WHT
THERMAL
CUT-OUT
125
°C(MAG.)
WHT
WHT
ORG
FAN MOTOR
RED
WHT
HIGH VOLTAGE COMPONENTS
MAGNETRON
H.V.WIRE A
H.V.
RECTIFIER
H.V. WIRE B
H.V.
CAPACITOR
R-820BC
1
2
3
45
6
Figure S-1. Pictorial Diagram
H
G
F
E
D
C
B
A
Page 7
R-820BC
1
A
2
3
R4 27
AC120V
B
60Hz
A 1
VRS1
4
10G471K
1
d
ab
T1
D1-4
1N4002
8
D3
6
D4
D1
D2
D5
+
–
C1 0.1µ/50v
(J1)
C
c
45
Q2 2SB1238
C10
D6
R5 4.7k
C 2
+
–
C2 470µ/50v
R2 510 1/2w
C3 0.1µ/50v
C4 10µ/35v
R3 510 1/2w
SP1
C 3
C 1
C 9
C 4
LED
GND
VC
VA
VR
INT
6
A
B
C
RY5
BUZZER
C 5
C15
FAN MOTOR
FAN MOTOR
A 3
D12D11
R6 3.3k
RY1
D
CONVECTION
MOTOR
OVEN LAMP
TURNTABLE
MOTOR
E
F
BOTTOM
HEATER
TOP
HEATER
A 5
N.O.
COM
N.O.
COM
N.O.
COM
N.O.
RY6
RY4
RY3
RY2
MICRO
COM
D7D10D9D8
Q3
KRC243M
+
–
C5
10µ/35v
C16
C 6
C14
C 8
C11
C 7
C17
C13
C12
CONVECTION
MOTOR
OVEN LAMP
TURNTABLE
MOTOR
BOTTOM
HEATER
TOP
HEATER
N.C.
MICRO
OVEN
THERMISTOR
N.C.
DOOR
SWITCH
D
E
F
B 2B 1D 3D 1
G
OVEN THERMISTOR
DOOR SWITCH
G
NOTE: IF NOT SPECIFIED, 1/4w ± 5%
: IF NOT SPECIFIED, 1SS270A
H
H
Figure S-2. Power Unit Circuit
1
2
3
45
6
5
Page 8
R-820BC
PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V.
REF. NO.PART NO.DESCRIPTIONQ'TYCODE
ELECTRIC PARTS
1- 1QSW-MA110WRE0Secondary interlock switch / door sensing switch2AH
1- 1QSW-MA131WRE0
1- 2FFS-BA021WRK0
1- 3RMOTDA140WRE0Turntable motor1AV
1- 3RMOTDA231WRE0Turntable motor (Interchangeable)1AR
1- 3RMOTDA188WRE0Turntable motor (Interchangeable)1AS
1- 4FH-DZA025WRK0High voltage rectifier assembly1AN
*
1- 5RC-QZA173WRE0High voltage capacitor (Interchangeable)1AX
7- 1XFPSD40P08K00Screw : 4mm x 8mm13AA
7- 2XEPSD40P25000Screw : 4mm x 25mm2AA
7- 3LX-EZA042WRE0Special screw2AB
7- 4LX-NZ0061WRE0Flange nut4AA
7- 5XBPWW30P05K00Screw : 3mm x 5mm2AA
7- 6XCTWW40P08000Screw : 4mm x 8mm8AB
7- 7XHPSD30P06000Screw : 3mm x 6mm1AA
7- 8XHTSD40P08RV0Screw : 4mm x 8mm3AA
7- 9XOTSD40P12RV0Screw : 4mm x 12mm13AA
7-10XOTSD40P12000Screw : 4mm x 12mm10AA
7-11*************These line head screws have been changed to 7-9.0-7-12XOTSF40P08000Screw : 4mm x 8mm1AA
7-13XBTSD40P05000Screw : 4mm x 5mm2AA
7-14XNEUW40-32000Nut : 4mm x 3.2mm1AA
7-15XRESE40-06000Ring : 4mm x 0.6mm1AA
7-16XWHUW40-08000Washer : 4mm x 0.8mm1AA
7-17XWHUW48-08120Washer : 4.8mm x 0.8mm1AA
7-18XWSUW40-10000Washer : 4mm x 1.0mm1AA
7-19LX-CZA070WRE0Special screw (Torx tamper proof screw)2AC
7-20XCPSD40P08000Screw : 4mm x 8mm1AA
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER2. REF. NO.3. PART NO.4. DESCRIPTION
Order Parts from the authorized SHARP parts Distributor for your area.
Defective parts requiring return should be returned as indicated in the Service Policy.
PACKING AND ACCESSORIES
TRAY HOLDER
(SPADFA424WRE0)
TURNTABLE TRAY
RACK
LAMP CAUTION
DOOR PROTECTION SHEET
(SPADPA204WRE0)
TOP PAD ASSEMBLY
(FPADBA381WRK0)
WRAP COVER
(SSAKHA034WRE0)
PLASTIC SHEET
(SPADPA616WREZ)
CABINET COVER
(SPAKHA009WRE0)
TOUCH GUIDE
INSTRUCTION BOOK
TURNTABLE SUPPORT
TRAY PAD
(SPADPA577WRE0)
FOAM SHEET
(SPAKHA012WREZ)
Not Replaceable Items.
8
BOTTOM PAD ASSEMBLY
(FPADBA382WRK0)
PACKING CASE
FPAK-A505WRKZ
Page 11
R-820BC
7-9
7-8
4-4
7-9
7-19
7-19
7-5
4-1
4-30
7-10
7-10
2-1
6-2
1-10
7-15
4-25
4-33
4-29
7-10
7-12
4-32
4-19
4-18
1-11
2-2
4-23
4-26
7-4
4-3
4-39
7-13
4-36
4-41
7-13
7-10
7-10
7-2
1-6
4-11
6-12
4-10
7-1
2-4
2-4
1-19
7-1
4-9
7-9
7-9
7-1
7-9
2-3
1-5
1-13
6-13
1-4
6-4
6-3
1-1
1-7
1-1
4-17
4-28
1-18
4-12
4-13
6-2
4-19
4-18
4-32
4-16
7-4
7-9
7-1
4-6
7-1
6-7
4-2
1-2
7-3
7-10
4-24
4-21
4-14
7-14
7-18
1-17
7-8
7-6
x3
7-16
4-34
4-40
7-10
6-5
7-10
7-7
4-40
4-37
4-35
4-42
4-38
4-43
7-17
4-31
7-10
4-15
7-1
1-9
1-8
1-12
1-16
1-15
1-14
7-20
4-22
7-1
7-1
4-7
1-3
4-5
4-8
4-20
7-6
7-6
7-6
7-8
6-11
A
A
4-27
7-9
7-9
4-44
1
OVEN AND CABINET PARTS
A
B
C
D
E
F
2
3
45
6
A
B
C
D
E
F
G
G
H
H
1
2
3
9
45
6
Page 12
R-820BC
1
2
3
45
6
3-7
A
CONTROL PANEL PARTS
3-2
3-5
3-4
A
3-3
B
3-7
B
3-3-3
3-3-4
3-1
C
C
DOOR PARTS
D
3-3-2
5-8
D
5-9
3-3-1
E
5-1
E
5-6
F
G
5-2
5-4
5-8
5-3
MISCELLANEOUS
6-7
6-1
F
G
5-5
6-8
H
6-10
H
6-9
Actual wire harness may be different from illustration.
1
2
3
45
2004 SHARP CORP. (2S1.700E) Printed in U.S.A
6
10
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