Page 1
R-202EK
SUPPLEMENTAL SERVICE MANUAL
S9127R202EPK/
MICROWAVE OVEN
MODEL
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.
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-202EK
This is a supplemental Service Manual for Model R-202EK. This model is quite similar to base
model R-202EW. Use this supplemental manual together with the Base Model Service Manual
(Refer No. is S7116R202EPW/) for complete operation, service information, etc..
TABLE OF CONTENTS
Page
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
MICROWAVE MEASUREMENT PROCEDURE ...................................................................................................2
FOREWORD AND WARNING...............................................................................................................................3
PRODUCT DESCRIPTION....................................................................................................................................4
OVEN DIAGRAM ...................................................................................................................................................5
OVEN SCHEMATIC...............................................................................................................................................5
PICTORIAL DIAGRAM ..........................................................................................................................................6
PARTS LIST ..........................................................................................................................................................7
PACKING AND ACCESSORIES ...........................................................................................................................8
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
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R-202EK
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 The 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.
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WARNING TO SERVICE PERSONNEL
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-202EK
Don't Touch !
Danger High Voltage
Before Servicing
1. Disconnect the power supply cord
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.
, and then remove
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 a microwave leakage test should be carried out.
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R-202EK
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/cm2 at
any point 5cm or more from the external surface of the oven.
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.
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.
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R-202EK
SERVICE MANUAL
MICROWAVE OVEN
R-202EK
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service
Information for the SHARP MICROWAVE OVEN, R-202EK.
The model R-202EK is quite similar to base model R-202EW (Refer No. is S7116R202EPW/).
It is recommended that service personnel carefully study the entire text of this manual and the base 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
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R-202EK
PRODUCT DESCRIPTION
SPECIFICATIONS
ITEM DESCRIPTION
Power Requirements 120 Volts
60 Hertz
Single phase, 3 wire grounded
Power Consumption 1100W / Approx. 9.6 Amperes
Power Output 700 W nominal of RF microwave energy (IEC Test procedure)
Operating frequency 2450 MHz
Case Dimensions Width 18-1/8"
Height 10-7/8"
Depth 13-1/4"
Cooking Cavity Dimensions Width 12-5/8"
(0.7 Cubic feet) Height 7-7/8"
Depth 13-1/4"
Control Complement Touch Control System
Clock (1:00 - 12:59)
Timer (0 - 99 minutes 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
P-HI ................................... Full power throughout the cooking time
P-90 .................................................... approx. 90% of FULL Power
P-80 .................................................... approx. 80% of FULL Power
P-70 .................................................... approx. 70% of FULL Power
P-60 .................................................... approx. 60% of FULL Power
P-50 .................................................... approx. 50% of FULL Power
P-40 .................................................... approx. 40% of FULL Power
P-30 .................................................... approx. 30% of FULL Power
P-20 .................................................... approx. 20% of FULL Power
P-10 .................................................... approx. 10% of FULL Power
P-0 ...................................... No power throughout the cooking time
EXPRESS DEFROST pad
MINUTE PLUS pad
Instant Start pads
Number selection pads
TIMER / CLOCK pad
POWER LEVEL pad
START pad
STOP/CLEAR pad
Oven Cavity Light Yes
Safety Standard UL Listed.
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
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Page 7
OVEN DIAGRAM
R-202EK
TOUCH CONTROL PANEL
See NOTE
See NOTE
NOTE:
The directed features are disabled after three
minutes when the oven is not in use. These
features are automatically enabled when the
door is opened and closed or the STOP/
CLEAR pad is pressed.
See NOTE
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
A3
120V AC
60 Hz
GRN
Figure O-1. Oven Schematic-Off Condition
NOTE: " " indicates components with potential above 250V.
C/T FUSE
CONTROL UNIT
OL FM
OVEN
LAMP
SECONDARY
INTERLOCK
SWITCH
TEMPERATURE
FUSE (OVEN)
(RY-1)
TTM
TURNTABLE
MOTOR
A1
N.O.
(RY-2)
B2 B1
FAN
MOTOR
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
COM.
MONITOR
SWITCH
POWER
TRANSFORMER
CAPACITOR
0.82µF
AC2100V
RECTIFIER
MAGNETRON
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R-202EK
1
A
B
NOTE:
The grounding conductor of
the power supply cord has
been grounded by power
supply cord fixing screw.
The screw must allways be
kept tight.
N
WHT
GRD
2
POWER SUPPLY CORD
120V 60Hz
NOTE:
The neutral (WHT) wire must be
connected to the terminal with "N"
mark on the power supply cord.
H
RED
3
BLK
C/T FUSE
RED
C
RED
WHT
WHT
WHT
GRY
ORG
RED
45
HIGH
VOLTAGE
CAPACITOR
H.V.
RECTIFIER
(WHT)
(RED)
POWER
MAGNETRON
(RED)
HIGH VOLTAGE COMPONENTS
GRY
ORG
TRANSFORMER
6
A
B
C
D
D
OVEN LAMP
FAN MOTOR
GRY
ORG
ORG
BLK
E
TEMPERATURE
FUSE (OVEN)
TURNTABLE
MOTOR
ORG
WHT
WHT
GRY
N.C.
RY1
1
3
GRY
COM
CN-A
ORG
1
2
SECONDARY
INTERLOCK SWITCH
WHT
3
N.O.
N.O.
COM
WHT
COM
GRY
F
DOOR
SENSING SWITCH
GRN
GRN
G
H
GRY
GRN
N.O.
COM
GRY
GRN
CN-B
2
1
PRIMARY
INTERLOCK
RELAY
1
2
CONTROL PANEL
CN-B
ORG
RY2
SP1
RED
MONITOR
ORG
T1
RED
SWITCH
N.O.
CN-A
E
Figure S-1. Pictorial Diagram
F
G
H
1
2
3
45
6
6
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P ARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
ELECTRIC PARTS
1- 1 QSW-MA085WRE0 Second interlock switch/ Door sensing switch 2 AF
1- 1 QSW-MA137WRE0
1- 2 FFS-BA027WRKZ
1- 3 FACCDA079WRE0 Power supply cord 1 AF
1- 3 FACCDA064WRE0 Power supply cord (Interchangeable) 1 AF
1- 4 FH-DZA102WRKZ High voltage rectifier assy 1 AN
*
1- 4 FH-DZA088WRK0 High voltage rectifier assy (Interchangeable) 1 AP
*
1- 5 RC-PZA041WRE0 High voltage capacitor 1 AS
*
1- 5 RC-QZA307WRZZ High voltage capacitor (Interchangeable) 1 AX
*
1- 6 RMOTEA383WRE0 Fan motor 1 AV
1- 6 RMOTEA355WRE0 Fan motor (Interchangeable) 1 AU
∆
1- 7 RV-MZA226WRE0 Magnetron 1 BE
*
∆
1- 7 RV-MZA306WRZZ Magnetron (Interchangeable) 1 BL
*
1- 8 RLMPTA082WRZZ Oven lamp 1 AL
1- 9 RMOTDA186WRE0 Turntable motor 1 AW
1- 9 RMOTDA211WRE0 Turntable motor (Interchangeable) 1 AS
1- 9 RMOTDA229WRE0 Turntable motor (Interchangeable) 1 AQ
1-10 QFS-TA038WRE0 Temperature fuse 120˚C (Oven) 1 AK
1-11 RTRN-A648WRZZ Power transformer 1 BH
*
2- 1 GCABUA828WRPZ Outer case cabinet 1 BD
2- 2 GLEGPA074WRE0 Foot 2 AC
3- 1 FPNLCB602WRKZ Control panel frame with key unit 1 BA
3- 1-1 FUNTKB098WREZ Key unit 1 AW
3- 2 JBTN-B164WRFZ Open button 1 AK
3- 3 MSPRCA050WRE0 Open button spring 1 AB
3- 4 DPWBFC188WRUZ Control unit 1 BH
3- 5 QCNC-A014WRZZ Rubber connector 1 AE
3- 6 RLCDSA097DRZZ Liquid crystal display 1 AM
3- 7 XEPSD30P08XS0 Screw; 3mm x 8mm 3 AA
4- 1 PHOK-A120WRFZ Latch hook 1 AH
∆
4- 2 LBNDKA038WRP0 Capacitor holder 1 AF
4- 3 NFANJA029WRE0 Fan blade 1 AK
4- 4 PDUC-A777WRPZ Fan duct 1 AP
4- 5 ************* Oven cavity (Not replaceable part) 1--
∆
4- 6 GCOVHA425WRPZ Turntable motor cover 1 AK
4- 7 MLEVPA241WRFZ Switch lever 1 AG
4- 8 PCOVPA276WRE0 Waveguide cover 1 AM
4- 9 PCUSUA237WRP0 Cushion 2 AF
4-10 PPACGA176WREZ TTM packing 1 AC
4-11 PCUSUA278WRP0 Cushion 1 AB
4-12 PCUSUA409WRP0 Cushion 1 AD
4-13 PCUSGA568WREZ Cushion 1 AC
∆
5- 1 FDORFA348WRTZ Door panel assembly 1 BC
∆
5- 2 GWAKPA834WRRZ Door frame 1 AR
5- 3 HPNL-A764WREZ Door screen 1 AP
∆
5- 4 LSTPPA205WRFZ Latch head 1 AF
5- 5 MSPRTA187WRE0 Spring 1 AC
5- 6 PSHEPA782WREZ Sealer film 1 AG
5- 7 GCOVHA424WRFZ Choke cover 1 AK
6- 1 NTNT-A034WRF0 Turntable 1 AM
6- 2 FROLPA099WRKZ Turntable support 1 AP
6- 3 TCAUAA258WRRZ Monitor caution 1 AC
6- 4 TCAUAA268WRRZ DHHS caution label 1 AF
6- 5 TINSEA919WRRZ Instruction book 1 AM
6- 6 FW-VZB837WREZ Main wire harness 1 AR
Second interlock switch/ Door sensing switch (Interchangeable)
C/T fuse (120˚C, 13A) and monitor switch assembly (AM51620C53Y1)
2AH
1AS
CABINET PARTS
CONTROL PANEL PARTS
OVENPARTS
DOORPARTS
MISCELLANEOUS
R-202EK
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R-202EK
REF. NO. PART NO. DESCRIPTION Q'TY CODE
SCREWS, NUTS AND WASHERS
7- 1 XHPSD40P08K00 screw : 4 mm x 8 mm 2 AC
7- 2 XHTSD40P08RV0 Screw : 4mm x 8mm 4 AA
7- 3 LX-CZA070WRE0 Special screw (Torx tamper proof screw) 2 AC
7- 4 LX-CZ0052WRE0 Special screw 2 AA
7- 5 LX-EZA042WRE0 Special screw 2 AB
7- 6 XHPSD30P06000 Screw : 3mm x 6mm 1 AA
7- 7 XHPSD40P08000 Screw : 4mm x 8mm 3 AA
7- 8 XHTSD40P12RV0 Screw : 4mm x 12mm 1 AA
7- 9 XOTSF40P08000 Screw : 4mm x 8mm 2 AA
7-10 XOTSD40P08000 Screw : 4mm x 8mm 7 AA
7-11 XCPSD40P06000 Screw : 4mm x 6mm 1 AA
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
2. 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
DOOR PROTECT SHEET
SPADPA580WRE0
6-5 INSTRUCTION BOOK
MICROWAVE OVEN
6-1 TURNTABLE TRAY
FOAM SHEET
SPAKHA014WREZ
6-2 TURNRTABLE SUPPORT
INTO THE
OVEN CAVITY
TOP PAD ASSEMBLY
FPADBA454WRKZ
POLYETHYLENG BAG
SSAKHA014WRE0
BOTTOM PAD ASSEMBLY
FPADBA455WRKZ
TRAY PAD ASSY
(CPADBA287WRKZ)
Not replaceable items.
8
PACKING CASE
SPAKCD671WREZ
Page 11
R-202EK
1
OVEN AND CABINET PARTS
A
B
C
D
2
1-10
2-1
4-9
4-12
3
45
6
7-10
A
7-3
7-10
7-10
B
7-3
6-3
7-7
7-9
1-7
7-9
6-4
1-8
4-4
7-10
7-10
7-6
4-3
7-2
7-10
4-13
1-6
C
1-2
D
7-8
E
1-3
7-5
4-9
E
4-11
7-10
1-11
4-5
F
7-11
7-2
F
4-8
4-1
6-1
G
2-2
6-2
H
7-1
4-10
1-9
4-6
2-2
4-7
7-4
1-1
1-2
1-1
1-4
4-2
G
7-1
1-5
H
7-2
1
2
3
45
6
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Page 12
R-202EK
1
A
CONTROL PANEL PARTS
B
C
D
3-2
E
3-1
3-1-1
3-3
2
3
Before attaching Control unit to Control
panel, foil side of Control unit must be
cleaned by ethyl-alcohol.
3-4
3-5
3-6
5-3
5-1
3-7
45
MISCELLANEOUS
Actual wire harness may be different than illustration.
5-7
DOOR PARTS
5-6
6
A
6-6
B
C
D
E
F
F
5-2
G
G
5-5
5-4
H
1
2
3
45
6
H
COPYRIGHT © 2001 BY SHARP CORPORATION
ALL RIGHTS RESERVED.
No part of this publication may be reproduced,
stored in retrieval systems, or transmitted in any
form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without prior
written permission of the publisher.
10
2001 SHARP CORP. (9S1.700E) Printed in U.S.A
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