Sharp R-201EW Service Manual
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Sharp R-201EW Service Manual

Sharp R-201EW 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
PARTS LIST ........................................................................................................................................................ 30
PACKING AND ACCESSORIES ......................................................................................................................... 33
SHARP CORPORATION
SERVICE MANUAL
MODEL
ON
DEF. LBS.
QTY. CHEC
K
EX PR ES
S
DE FR OS
MIN UT E
T
PLU S
TO ADJU
ST QUAN
TITY TOUC
H SAME
PAD AGAI
N
SN AC KS
POP CO RN
BEV ERA
GE
CO OKI NG
BAK ED
PO TAT O
FRE SH
VEG ETA
BLE S
DINN ER
PLAT E
REHEA T
3-4 min.
ROLL ES/M
UFFIN
REHEA T
1 medium
10-1 5 sec.
1
2
3
4
5
6
7
8
9
POW ER
In the interest of user-safety the oven should be restored to its original
LEV EL
O
TIM ER
CLO CK
ST OP
CL EA R
ST AR T
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-201EW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-201EW
S2102R201EPW/
Page

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  • Page 1: Table Of Contents

    R-201EW SERVICE MANUAL S2102R201EPW/ MICROWAVE OVEN R-201EW MODEL DEF. LBS. QTY. CHEC EX PR ES DE FR OS MIN UT E PLU S TO ADJU ST QUAN TITY TOUC H SAME PAD AGAI SN AC KS POP CO RN BEV ERA...

  • 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-201EW 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-201EW 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-201EW 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-201EW. It is recommended that service personnel carefully study the entire...

  • Page 6: Product Specifications

    R-201EW PRODUCT DESCRIPTION SPECIFICATIONS ITEM DESCRIPTION Power Requirements 120 Volts 60 Hertz Single phase, 3 wire grounded Power Consumption 1030W / Approx. 9.0 Amperes Power Output 600 W nominal of RF microwave energy (IEC 705 Test procedure) Operating frequency 2450 MHz Case Dimensions Width 18-1/8"...
  • Page 7 R-201EW 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-201EW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during so that it will function in the following sequence. oven operation. (1) When the door opens from the closed position, the secondary interlock switch, door sensing switch and OFF CONDITION primary interlock relay (RY2) open their contacts.
  • Page 9 R-201EW 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 0.86µF 120V AC DOOR 60 Hz SENSING MONITOR SWITCH SWITCH...
  • Page 10 R-201EW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM CAUTION: BEFORE REPLACING A BLOWN C/T FUSE, TEST THE DOOR SENSING SWITCH, PRI- The door is opened by pulling the door, refer to the Figure MARY INTERLOCK RELAY (RY2), SECOND- D-1.

  • Page 11: Troubleshooting Guide

    R-201EW 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-201EW 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-201EW 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-201EW 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-201EW 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-201EW 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-201EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER c) When touching the pads, sometimes a pad produces no signal. 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.
  • Page 18 R-201EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MINUTE BEVERAGE PLUS FRESH EXPRESS POWER VEGETABLES DEFROST LEVEL TIMER STOP BAKED POTATO CLOCK CLEAR POPCORN START RELAY TEST 1. Disconnect the power supply cord and then remove outer case. 2. Open the door and blocked it open.
  • Page 19 R-201EW 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-201EW 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. unit from the AC line voltage. In addition, the synchronizing...
  • Page 21 R-201EW DESCRIPTION OF LSI DESCRIPTION OF LSI The I/O signal of the LSI are detailed in the following table. Pin No. Signal Description RESET Auto clear terminal. Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set to “L”...
  • Page 22 R-201EW Pin No. Signal Description Signal similar to K02. When either G7 line on key matrix is touched, a corresponding signal will be input into P23. Signal similar to K02. When either G8 line on key matrix is touched, a corresponding signal will be input into K00.
  • Page 23 R-201EW SERVICING 1. Precautions for Handling Electronic Components repair all the controls (sensor-related ones included) of This unit uses CMOS LSI in the integral part of the the touch control panel while keeping it connected to the circuits. When handling these parts, the following oven.

  • 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-201EW 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 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-201EW 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-201EW 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-201EW 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-201EW...

  • Page 31: Control Panel Circuit

    R-201EW...

  • Page 32: Parts List

    R-201EW 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. DESCRIPTION Q'TY CODE ELECTRIC PARTS 1- 1 QSW-MA137WRE0 Secondary interlock switch & door sensing switch...
  • Page 33 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. SERVICE INFORMATION The units manufactured in Jan. / 2001 have the oven lamp separeted from the lamp socket.
  • Page 34 R-201EW 7-11 OVEN AND CABINET PARTS 7-10 7-11 7-14 7-10 7-13 4-14 4-17 6-10 7-12 4-14 6-10 4-11 1-11 4-16 1-10 4-10 4-15 4-13 4-12...

  • Page 35: Packing And Accessories

    R-201EW Before attaching Control unit to Control panel, foil side of Control unit must be cleaned by ethyl- alcohol. CONTROL PANEL PARTS DOOR PARTS 3-2-2 3-2-1 MISCELLANEOUS Actual wire harness may be different than illustration. TOP PAD ASSEMBLY FPADBA387WRK0 PACKING AND ACCESSORIES...
  • Page 36 R-201EW COPYRIGHT © 2001 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be repro- duced, stored in retrieval systems, or trans- mitted in any form or by any means, elec- tronic, mechanical, photocopying, record- ing, or otherwise, without prior written per- mission of the publisher.

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