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Sharp R-351NW Service Manual

Service manual
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PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPO-
SURE TO EXCESSIVE MICROWAVE ENERGY
BEFORE SERVICING
CHAPTER 1. WARNING TO SERVICE PERSONNEL
CHAPTER 2. MICROWAVE MEASUREMENT PRO-
CEDURE
CHAPTER 3. FOREWORD AND WARNING
CHAPTER 4. PRODUCT DESCRIPTION
CHAPTER 5. GENERAL INFORMATION
CHAPTER 6. OPERATION
SERVICE MANUAL
MODEL
In the interest of user-safety the oven should be restored to
Palomitas de Maiz
Minuto Extra
its original condition and only parts identical to those speci-
fi ed should be used.
Nivel de
Cronometro
Potencia
Reloj
Detencion
Comienzo
Cancelacion
WARNING TO SERVICE PERSONNEL: Microwave ovens
Function Rapida
Derretir
Suavizar
Calentar
1 Mantequilla
1 Helados
1 Coberturas de
2 Chocolate
2 Queso crema
postres
COCCION
DESCONGELACION RECALENTAR
contain circuitry capable of producing very high voltage
1 Verdura
1 Came Molida
1 Caserola
Fresca
2 Aves
2 Sopa
2 Came Molida
Deshuesadas
3 Pizza
3 Bistec/
3 Papa Asada
4 Bebida
4 Arroz
Chuletas
5 Plato Principal
5 Verdura
4 Aves
6 Pan Presco
Congelada
7 Pan Congelada
6 Entradas
8 Veroura Bnlatada
and current, contact with following parts may result in a se-
Congeladas
vere, possibly fatal, electrical shock. (High Voltage Capaci-
tor,
High Voltage Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness etc..)
CONTENTS
CHAPTER 7. TROUBLESHOOTING GUIDE
CHAPTER 8. TEST PROCEDURES
CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY
CHAPTER 10. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 11. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
CHAPTER 12. CIRCUIT DIAGRAMS
Parts List
This document has been published to be used for after sales service only.
The contents are subject to change without notice.
S3910R351NPAL

MICROWAVE OVEN

R-351NW
R-351NW

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  • Page 1: Microwave Oven

    R-351NW SERVICE MANUAL S3910R351NPAL MICROWAVE OVEN R-351NW MODEL In the interest of user-safety the oven should be restored to Palomitas de Maiz Minuto Extra its original condition and only parts identical to those speci- fi ed should be used. Nivel de...

  • Page 2: Table Of Contents

    CONTENTS PRECAUTIONS TO BE OBSERVED BEFORE [12] K: KEY UNIT TEST ........8-5 AND DURING SERVICING TO AVOID POSSIBLE [13] L: RELAY TEST .......... 8-6 EXPOSURE TO EXCESSIVE MICROWAVE ENERGY [14] M: DEFROST TEST ........8-6 BEFORE SERVICING [15] N: FOIL PATTERN ON THE PRINTED CHAPTER 1.

  • Page 3: Precautions To Be Observed Before

    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 4: Before Servicing

    R-351NW CHAPTER 1. 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. (Example) High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifi er Assembly, High Voltage Harness etc..

  • Page 5: Chapter 2. Microwave Measurement Procedure Requirements

    R-351NW CHAPTER 2. MICROWAVE MEASUREMENT PROCEDURE [1] 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 by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm at any point 5cm or more from the external surface of the oven.

  • Page 6: Chapter 3. Foreword And Warning Foreword

    CHAPTER 3. FOREWORD AND WARNING [1] FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-351NW. It is recommended that service personnel carefully study the entire text of this manual so that they will be qualifi ed to render satisfac- tory customer service.

  • Page 7: Chapter 4. Product Description

    R-351NW CHAPTER 4. PRODUCT DESCRIPTION [1] SPECIFICATIONS 120 Volts Power Requirements 60 Hertz Single phase, 3 wire grounded Power Consumption 1530W / Approx. 13 Amperes 1100 W nominal of RF microwave energy (IEC Test procedure) Power Output Operating frequency 2450 MHz Width 20-1/2”...

  • Page 8: Chapter 5. General Information

    R-351NW CHAPTER 5. GENERAL INFORMATION [1] GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances.

  • Page 9: Touch Control Panel

    R-351NW 2. TOUCH CONTROL PANEL Palomitas de Maiz Minuto Extra Nivel de Cronometro Potencia Reloj Detencion Comienzo Cancelacion Function Rapida Derretir Suavizar Calentar 1 Mantequilla 1 Helados 1 Coberturas de 2 Chocolate 2 Queso crema postres COCCION DESCONGELACION RECALENTAR 1 Verdura...

  • Page 10: Chapter 6. Operation

    R-351NW CHAPTER 6. OPERATION [1] DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. 3. POWER LEVEL P-0 TO P-HI COOKING 1. OFF CONDITION When Variable Cooking Power is programmed, the 120 volts Closing the door activates door sensing switch and secondary A.C.

  • Page 11: Oven Schematic

    R-351NW [2] OVEN SCHEMATIC 1. Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY NOTE: " " indicates components with potentials above 250V (MAGNETRON) POWER TRANSFORMER FUSE PRIMARY INTERLOCK RELAY (RY2) CAPACITOR 0.91µF CONTROL UNIT...

  • Page 12: Description And Function Of Components

    R-351NW [3] DESCRIPTION AND FUNCTION OF COMPONENTS 1. DOOR OPEN MECHANISM 4. TURNTABLE MOTOR The door is opened by pushing the open button on the control The turntable motor rotates the turntable located on the bottom panel, refer to the Figure D-1.

  • Page 13: Chapter 7. Troubleshooting Guide

    R-351NW CHAPTER 7. 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 specifi...

  • Page 14: Chapter 8. Test Procedures

    R-351NW CHAPTER 8. TEST PROCEDURES [1] A: MAGNETRON ASSEMBLY 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. To test for an open fi lament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron fi lament leads should indicate less than 1 ohm.

  • Page 15: D: High Voltage Capacitor Test

    R-351NW [4] D: HIGH VOLTAGE CAPACITOR 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 capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open be- tween the terminals using an ohmmeter.

  • Page 16: F: Primary Interlock System Test

    R-351NW [7] F: PRIMARY INTERLOCK SYSTEM TEST 1. DOOR SENSING SWITCH 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 switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door closed.

  • Page 17: H: Blown Monitor Fuse Test

    R-351NW [9] H: BLOWN MONITOR 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 monitor 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 18: K: Key Unit Test

    R-351NW 2. Control Unit. The following symptoms indicate a defective control unit. 1) In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal.

  • Page 19: L: Relay Test

    R-351NW [13] L: RELAY 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. Disconnect the leads to the primary of the power transformer.
  • Page 20 R-351NW 5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 563Ω±10%). If any abnormal condition is detected, replace the control unit assembly.

  • Page 21: Outline Of Touch Control Panel

    R-351NW CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY [1] OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. 1) Key Unit 2) Control Unit (The Control Unit consists of Power Unit and CPU Unit). The principal functions of these units and the signals communicated among them are explained below.
  • Page 22 R-351NW 2. Servicing of Touch Control Panel We describe the procedures to permit servicing of the touch control panel of the microwave oven and the precautions you must take when doing so. To perform the servicing, power to the touch control panel is available either from the power line of the oven itself or from an external power source.

  • Page 23: Chapter 10. Precautions For Using Lead- Free Solder

    R-351NW CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE SOLDER Employing lead-free solder The “Main 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 suffi x letter indicates the alloy type of the solder.

  • Page 24: Chapter 11. Component Replacement And Adjustment Procedure [1] Warning

    R-351NW CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE [1] WARNING WARNING AGAINST HIGH VOLTAGE: 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 Rectifi er Assembly, High Voltage Harness etc..

  • Page 25: Outer Case Removal

    R-351NW [2] OUTER CASE REMOVAL To remove the outer case, procedure as follows. 1. Disconnect the power supply cord. 2. Open the oven door and block it open. 3. Remove the two (2) screws from the lower portion of the rear cabinet using a T20H Torx type or GTXH20-100 screw driver.

  • Page 26: Positive Lock Connector (No-Case Type) Removal

    R-351NW 2. REINSTALLATION 5. Reconnect the wire leads to the magnetron. Refer to 1. Reinstall the magnetron to waveguide fl ange with the “PICTORIAL DIAGRAM”. four (4) screws. 6. Reinstall outer case and check that the oven is 2. Reinstall the air duct to the oven cavity top plate and operating properly.

  • Page 27: Turntable Motor Removal

    7. Now, the turntable motor is free. 4. Where the corners have been snipped off bend corner areas flat. No sharp edges must be evident after removal of the 8. After replacement use the one (1) screw to fi t the turntable turntable motor cover.

  • Page 28: Power Supply Cord Replacement

    R-351NW Coil Shaft Groove joint pliers Shaft These are the positions Axis that should be pinched Stator with pliers. Stator Table brac Rotor Bracket Rotor Side View Rear View [11] POWER SUPPLY CORD REPLACEMENT 1. REMOVAL 2. INSTALL 1. Disconnect the power supply cord, and remove outer case.

  • Page 29: Door Sensing Switch/Secondary Interlock Switch And Monitor Switch Adjustment

    R-351NW [13] DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1. Adjustment 1. Disconnect the power supply cord, and then remove outer case. Then check lower portion of the latch hook, pushing and 2. Open the door and block it open.
  • Page 30 R-351NW 3. After any service, make sure of the following: 4. SEALER FILM 1. Door latch heads smoothly catch latch hook through latch 1. Put the adhesive tape on the backing fi lm of the sealer fi lm holes and that latch head goes through center of latch hole.

  • Page 31: Chapter 12. Circuit Diagrams

    R-351NW CHAPTER 12. CIRCUIT DIAGRAMS [1] Pictorial Diagram (Figure S-1) Figure S-1 Pictorial Diagram 12 - 1...

  • Page 32: Control Panel Circuit (Figure S-2)

    R-351NW [2] Control Unit Circuit (Figure S-2) Figure S-2 Control Panel Circuit 12 - 2...

  • Page 33: Printed Wiring Board Of Power Unit(Figure S-3)

    R-351NW [3] Printed Wiring Board of Power Unit(Figure S-3) Figure S-3. Printed Wiring Board of Power Unit 12 - 3...
  • Page 34 R-351NW 12 - 4...

  • Page 35: Parts List

    R-351NW PARTS LIST MICROWAVE OVEN HOW TO ORDER REPLACEMENT PARTS R-351NW MODEL To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION Parts marked “*” may cause undue microwave exposure.
  • Page 36 R-351NW [1] OVEN PARTS 7-10 7-10 7-10 1-14 1-13 4-15 4-12 7-11 4-16 1-12 4-13 7-10 7-10 7-12 1-11 4-14 4-12 4-17 4-10 4-18 1-10 4-12 4-11 7-10 7-10 7-10 4-12 7-10...
  • Page 37 R-351NW PARTS LIST PARTS CODE DESCRIPTION Q’TY PRICE RANK [1] OVEN PARTS ELECTRIC PARTS QSW-MA085WRE0 Secondary interlock switch / door sensing switch QSW-MA086WRE0 monitor switch FACCDA109WREZ Power supply cord FACCDA110WREZ Power supply cord (Interchangeable) FH-DZA122WRKZ High voltage rectifi er assmebly...
  • Page 38 R-351NW [2] DOOR AND CONTROL PANEL PARTS 3-2-1 3-2-3 Actual wire harness may be different from illustration. 3-2-2...
  • Page 39 R-351NW PARTS CODE DESCRIPTION Q’TY PRICE RANK [2] DOOR AND CONTROL PANEL PARTS CONTROL PANEL PARTS DPWB-A685DRKZ Control unit FPNLCC030WRKZ Panel sub assembly 3-2-1 GMADIA204WRRZ Display window 3-2-2 PSHEPB415WREZ Graphic sheet 3-2-3 QSW-KA045DRZZ Membrane switch JBTN-B266WRFZ Oven button LHLD-A262WRFZ LCD holder...
  • Page 40 1-4-17 XOTSF40P08000 1-7-11 PCUSUA235WRP0 1-4-13 COPYRIGHT© 2009 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.

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