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Sharp R-203BW Service Manual
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Sharp R-203BW Service Manual

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BEFORE SERVICING ...................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2
FOREWORD AND WARNING ............................................................................................................................... 3
PRODUCT SPECIFICATIONS .............................................................................................................................. 4
GENERAL INFORMATION ................................................................................................................................... 4
OPERATION .......................................................................................................................................................... 6
TROUBLESHOOTING GUIDE .............................................................................................................................. 9
TEST PROCEDURE ............................................................................................................................................ 10
TOUCH CONTROL PANEL ................................................................................................................................. 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 22
PICTORIAL DIAGRAM ........................................................................................................................................ 28
CONTROL PANEL CIRCUIT ............................................................................................................................... 29
PRINTED WIRING BOARD ................................................................................................................................. 30
PARTS LIST ........................................................................................................................................................ 31
PACKING AND ACCESSORIES ......................................................................................................................... 36
SHARP CORPORATION
SERVICE MANUAL
MODELS
EXP RE SS
MIN UTE
DE FRO ST
PLU S
SNA CKS
POP CO
RN
BEV ERA
GE
COO KIN
BAK ED
G
POT ATO
FRE SH
VEG ETA
BLE S
REH EAT
ING
DIN NER
PLA TE
RO LL,
MU FFI N
1
2
3
4
5
6
7
8
9
0
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 con-
tain 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 Recti-
fier Assembly, High Voltage Harness etc..)

TABLE OF CONTENTS

MICROWAVE OVEN
R-203BW
R-209BK
R-220BW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-203BW
R-209BK
R-220BW
S1803R220BPW/
Page

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  • Page 1: Table Of Contents

    R-203BW R-209BK R-220BW SERVICE MANUAL S1803R220BPW/ MICROWAVE OVEN R-203BW MODELS R-209BK R-220BW EXP RE SS MIN UTE DE FRO ST PLU S SNA CKS POP CO BEV ERA COO KIN BAK ED POT ATO FRE SH VEG ETA BLE S...

  • Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    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.

  • Page 3: Warning To Service Personnel

    R-203BW R-209BK R-220BW WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc..

  • Page 4: Microwave Measurement Procedure

    R-203BW R-209BK R-220BW 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/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition...

  • Page 5: Foreword And Warning

    MICROWAVE OVEN R-203BW/ R-209BK/ R-220BW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-203BW, R-209BK, R-220BW. It is recommended that service personnel carefully study the entire...

  • Page 6: Product Specifications

    R-203BW R-209BK R-220BW PRODUCT DESCRIPTION SPECIFICATIONS ITEM DESCRIPTION Power Requirements 120 Volts 60 Hertz Single phase, 3 wire grounded Power Consumption 1100W / Approx. 9.5 Amperes Power Output 700 W nominal of RF microwave energy (IEC 705 Test procedure) Operating frequency 2450 MHz Case Dimensions Width 18-1/8"...

  • Page 7: Oven Diagram

    R-203BW R-209BK R-220BW Electrical Requirements The electrical requirements are a 115 -120 volt 60 Hz, AC only, Grounded 3-Pronged Plug 15 or 20 amp. fused electrical supply. It is recommended that a separate Receptacle Box circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances.

  • Page 8: Operation

    R-203BW R-209BK R-220BW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during relay (RY2) and is mechanically associated with the door oven operation. so that it will function in the following sequence. (1) When the door opens from the closed position, the...
  • Page 9 R-203BW R-209BK R-220BW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED CLOCK APPEARS ON DISPLAY C/T FUSE MAGNETRON THERMAL CUT-OUT COM. POWER TRANSFORMER N.O. (RY-2) (RY-1) PRIMARY INTERLOCK RELAY CAPACITOR CONTROL UNIT 0.86 F 120V AC 60 Hz DOOR SENSING...
  • Page 10 R-203BW R-209BK R-220BW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM open, the C/T fuse blows simultaneously with closing of the monitor switch contacts. The door is opened by pulling the door, refer to the Figure CAUTION: BEFORE REPLACING A BLOWN C/T FUSE, D-1.

  • Page 11: Troubleshooting Guide

    R-203BW R-209BK R-220BW TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed.

  • Page 12: Test Procedure

    R-203BW R-209BK R-220BW CK = Check / RE = Replace A B C D E F F G H TEST PROCEDURE RE CK RE RE CK CK CK CK J POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power cord is plugged into wall receptacle.
  • Page 13 R-203BW R-209BK R-220BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the magnetron is grounded and must be replaced.
  • Page 14 R-203BW R-209BK R-220BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE RECTIFIER TEST 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. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading.
  • Page 15 R-203BW R-209BK R-220BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. PRIMARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH 1.
  • Page 16 R-203BW R-209BK R-220BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN C/T FUSE TEST 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. If the C/T fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...
  • Page 17 R-203BW R-209BK R-220BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If the key unit is defective. 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) Replace the key unit.
  • Page 18 R-203BW R-209BK R-220BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER DINNER MINUTE BEVERAGE PLATE PLUS FRESH EXPRESS POWER VEGETABLES DEFROST LEVEL TIMER STOP ROLL, BAKED MUFFIN CLOCK POTATO CLEAR POPCORN START RELAY TEST 1. Disconnect the power supply cord and then remove outer case.
  • Page 19 R-203BW R-209BK R-220BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER FOIL PATTERN ON THE PRINTED WIRING BOARD TEST To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse.

  • Page 20: Touch Control Panel

    R-203BW R-209BK R-220BW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit The touch control section consists of the following units as This circuit generates voltage necessary in the control shown in the touch control panel circuit.

  • Page 21: Description Of Lsi

    R-203BW R-209BK R-220BW DESCRIPTION OF LSI LSI(IZA868DR) The I/O signal of the LSI(IZA868DR) are detailed in the following table. Pin No. Signal Description 1-12 Segment data signal. SEG0-SEG11 Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) LCD (Pin No.)
  • Page 22 R-203BW R-209BK R-220BW Pin No. Signal Description INT2 Signal synchronized with commercial power source frequency. This is the basic timing for time processing of LSI. H : GND L : -5V 16.7 msec Key strobe signal. Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G6 line keys on key matrix is touched.
  • Page 23 R-203BW R-209BK R-220BW SERVICING 1. Precautions for Handling Electronic Components 5) Re-connect the power supply cord after the outer case This unit uses CMOS LSI in the integral part of the is installed. circuits. When handling these parts, the following 6) Run the oven and check all function.

  • Page 24: Component Replacement And Adjustment Procedure

    3. The door gasket or seal is damaged. 4. If the outer case (cabinet) is not fitted. WARNING FOR WIRING To prevent an electric shock, take the following pre- 3) Sharp edge: cautions. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, Chassis support and other metallic plate.
  • Page 25 R-203BW R-209BK R-220BW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP- NOTE: When replacing the outer case, the 2 special PLY BEFORE REMOVING OUTER CASE. Torx screws must be reinstalled in the same 2. DISCHARGE THE HIGH VOLTAGE CA- locations. PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

  • Page 26: Control Panel Assembly Removal

    Re-install 3. Turn the oven over. 1. Remove the any sharp edges on the turntable motor 4. Cut the four (4) bridges holding the turntable motor cover cover and the bottom plate with the cutting pliers. to the bottom plate with the cutting pliers as shown in 2.

  • Page 27: Pictorial Diagram

    R-203BW R-209BK R-220BW COOLING FAN MOTOR REMOVAL 15. Remove the two (2) screws holding the fan motor to the REMOVAL fan duct. 1. Disconnect the power supply cord and remove outer case. 16. Now, the fan motor is free. 2. Open the door and block it open.
  • Page 28 R-203BW R-209BK R-220BW 8-2. Then pull out the switch while pushing the plunger of the 5. Re-connect wire leads to the control unit. Refer to switch again. chapter "Pictorial Diagram". 8-3. Now the secondary interlock switch is free. 6. Make sure that monitor switch is operating properly and 9.
  • Page 29 R-203BW R-209BK R-220BW 5. Release choke cover from door panel. microwave energy from oven cavity during cook 6. Now choke cover is free. cycle. This function does not require that door be air- tight, moisture (condensation)-tight or light-tight. Therefore, occasional appearance of moisture, light...
  • Page 30 R-203BW R-209BK R-220BW...

  • Page 31: Control Panel Circuit

    R-203BW R-209BK R-220BW 10kF /16v 0.01 IZA868DR 220k 220k 220k (J6) (J7) 220k /50v (J4) (J5) (J2) (J3) 2SA933 HZ4C3 /16v 0.01 /16v /16v 0.01 4.7k /16v 0.01 – 3.3k /25v /50v SP30 (J1) VRS1...

  • Page 32: Printed Wiring Board

    R-203BW R-209BK R-220BW (J7) (J5) (J3) (J6) (J4) (J2) (J1) CN - B DOOR SW AC (N) FM TTM Figure S-3. Printed Wiring Board...

  • Page 33: Parts List

    Turntable motor (Interchangeable) 1-11 RTHM-A078WRE0 Thermal cut-out 125˚C 1-12 RTRN-A561WRE0 Power transformer CABINET PARTS 2- 1 GCABUA659WRP0 Outer case cabinet [R-203BW] 2- 1 GCABUA657WRP0 Outer case cabinet [R-209BK] 2- 1 GCABUA659WRP0 Outer case cabinet [R-220BW] 2- 2 GDAI-A304WRP0 Bottom plate...
  • Page 34 Control panel frame with key unit and LCD [R-209BK] 3- 2 FPNLCB364WRK0 Control panel frame with key unit and LCD [R-220BW] 3- 2 FPNLCB368WRK0 Control panel frame with key unit and LCD [R-203BW] 3- 2-1 FUNTKA857WRE0 Key unit [R-209BK] 3- 2-1 FUNTKA858WRE0...
  • Page 35 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 required return should be returned as indicated in the Service Policy.

  • Page 36: Oven And Cabinet Parts

    R-203BW R-209BK R-220BW OVEN AND CABINET PARTS 7-10 7-10 4-17 6-10 4-14 6-10 6-12 4-11 6-11 1-11 4-16 1-10 4-10 4-15 1-12 4-13 4-12...
  • Page 37 R-203BW R-209BK R-220BW Befor attaching Control unit to Control panel. Foil side of Control unit must be cleaned by ethyl- CONTROL PANEL PARTS alcohol. 3-2-2 DOOR PARTS 3-2-1 MISCELLANEOUS Actual wire harness may be different than illustration.

  • Page 38: Packing And Accessories

    DOOR PROTECTION SHEET POLYETHYLENG BAG SPADPA580WRE0 SSAKHA014WRE0 TURNTABLE TRAY CABINET COVER SPAKHA008WRE0 OPERATION MANUAL MICROWAVE OVEN BOTTOM PAD ASSEMBLY FPADBA376WRK0 TURNRABLE SUPPORT INTO THE OVEN CAVITY PACKING CASE Not replaceable items. SPAKCD032WRE0 [R-209BK] SPAKCD033WRE0 [R-220BW] SPAKCD052WRE0 [R-203BW] TRAY PAD ASSY (CPADBA244WRK0)
  • Page 39 R-203BW R-209BK R-220BW...
  • Page 40 No part of this publication may be reproduced, stored in a retrieval systems, or transmitted in any form or by any means, electronic, mechanical, pho- tocopying, recording, or otherwise, without prior written permission of the publisher. '98 SHARP CORP. (1S2.530E) Printed in U.S.A...

This manual is also suitable for:

R-209bkR-220bw

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