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Sharp R-305MR Service Manual

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TopPage
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPO-
SURE TO EXCESSIVE MICROWAVE ENERGY
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
CHAPTER 7. TROUBLESHOOTING GUIDE
SERVICE MANUAL
MODEL
In the interest of user-safety the oven should be restored to its origi-
nal 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 cur-
rent, 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..)
CONTENTS
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
S1701R305MPR/

MICROWAVE OVEN

R-305MR
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
R305MR

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  • Page 1: Microwave Oven

    TopPage R305MR SERVICE MANUAL S1701R305MPR/ MICROWAVE OVEN R-305MR MODEL In the interest of user-safety the oven should be restored to its origi- nal condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens con-...

  • Page 2: Table Of Contents

    CONTENTS PRECAUTIONS TO BE OBSERVED BEFORE [15] N: FOIL PATTERN ON THE PRINTED AND DURING SERVICING TO AVOID POSSIBLE WIRING BOARD TEST....... 8-6 EXPOSURE TO EXCESSIVE MICROWAVE ENER- CHAPTER 9. TOUCH CONTROL PANEL ASSEM- CHAPTER 1. WARNING TO SERVICE PERSON- OUTLINE OF TOUCH CONTROL PAN- EL ............

  • 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: When The Testing Is Completed

    R305MR CHAPTER 1. R305MR WARNING TO SERVICE PERSONNEL Service Manual 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 Rectifier Assembly, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions.

  • Page 5: Chapter 2. Microwave Measurement Procedure

    R305MR CHAPTER 2. R305MR MICROWAVE MEASUREMENT PROCEDURE Service Manual [1] Requirements: 1. Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/ at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the use- ful 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

    Service Manual [1] FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-305MR. It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service.

  • Page 7: Chapter 4. Product Description

    R305MR CHAPTER 4. R305MR PRODUCT DESCRIPTION Service Manual [1] SPECIFICATIONS ITEM DESCRIPTION 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 Grounding Instructions

    R305MR CHAPTER 5. R305MR GENERAL INFORMATION Service Manual [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 accor- dance with the National Electrical Code and local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.
  • Page 9 R305MR 2. TOUCH CONTROL PANEL NOTE: Some one-touch cooking features such as “MINUTE PLUS” are disabled after three minutes when the oven is not in use. These fea- tures are automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed. 5 –...

  • Page 10: Chapter 6. Operation Description Of Operating Se- Quence

    R305MR CHAPTER 6. R305MR OPERATION Service Manual [1] DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. OFF CONDITION 3. POWER LEVEL P-0 TO P-90 COOKING Closing the door activates door sensing switch and secondary inter- When Variable Cooking Power is programmed, the 120 volts A.C.

  • Page 11: Oven Schenatic

    R305MR [2] OVEN SCHENATIC 1. Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY (MAGNETRON) (OVEN) NOTE: " " indicates components with potentials above 250V. (MAGNETRON) POWER TRANSFORMER FUSE PRIMARY INTERLOCK RELAY (RY2) CAPACITOR 0.19μF CONTROL UNIT AC 2100V...

  • Page 12: Description And Function Of Components

    R305MR [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 panel, The turntable motor rotates the turntable located on the bottom of the refer to the Figure D-1. oven cavity, so that the food on the turntable is cooked evenly.

  • Page 13: Chapter 7. Troubleshooting Guide

    R305MR CHAPTER 7. R305MR TROUBLESHOOTING GUIDE Service Manual 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 14: Chapter 8. Test Procedures

    R305MR CHAPTER 8. R305MR TEST PROCEDURES Service Manual [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 filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.

  • Page 15: D: High Voltage Capacitor Test

    R305MR 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. NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts. [4] D: HIGH VOLTAGE CAPACITOR TEST 1.

  • Page 16: G: Monitor Switch Test

    R305MR 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. If improper operation is indicated, replace the door sensing switch. 5.

  • Page 17: I: Noise Filter Test

    R305MR If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be replaced with “monitor fuse and monitor switch assembly” part number FFS-BA033WRKZ or FFS-BA037WRKZ, even if the monitor switch operates normally. The monitor fuse and moni- tor switch assembly is comprised of a 20 ampere fuse and switch.

  • Page 18: K: Key Unit Test

    R305MR d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up. g) The figure of all digits flicker. 3) Other possible problems caused by defective control unit. a) Buzzer does not sound or continues to sound.

  • Page 19: L: Relay Test

    R305MR [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. 5.
  • Page 20 R305MR 5) Make a visual inspection of the varistor. Check for burned damage and examine the trans- former with a tester for the presence of layer short-circuit (check the primary coil resis- tance which is approximately 563Ω±10%). If any abnormal condition is detected, replace the control unit assembly.

  • Page 21: Chapter 9. Touch Control Panel Assem- Bly

    R305MR CHAPTER 9. R305MR TOUCH CONTROL PANEL ASSEMBLY Service Manual [1] OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit The touch control section consists of the following units. This circuit generates voltages necessary in the control unit from 1) Key Unit the AC line voltage.

  • Page 22: Servicing For Touch Control Panel

    R305MR [2] SERVICING FOR TOUCH CONTROL PANEL 1. Precautions for Handling Electronic Components b) On some models, the power supply cord between the touch control panel and the oven proper is so long enough that This unit uses CMOS LSI in the integral part of the circuits. When han- they may be separated from each other.

  • Page 23: Chapter 10. Precautions For Using Lead

    R305MR CHAPTER 10. R305MR PRECAUTIONS FOR USING LEAD-FREE SOLDER Service Manual 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 suffix letter indicates the alloy type of the solder.

  • Page 24: Chapter 11. Component Replacement And Adjustment Procedure Warnings

    1. Door does not close firmly. 4. If the outer case (cabinet) is not fitted. WARNING FOR WIRING To prevent an electric shock, take the following precau- 3) Sharp edge: tions. Bottom plate, Oven cavity, Waveguide flange and 1. Before wiring, other metallic plate.

  • Page 25: Outer Case Removal

    R305MR [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

    R305MR 2. REINSTALLATION 4. Hold the other end of the chassis support to the magnetron with the one (1) screw. 1. Reinstall the magnetron to waveguide flange with the four (4) 5. Reconnect the wire leads to the magnetron. Refer to “PICTORIAL screws.

  • Page 27: Turntable Motor Removal

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

  • Page 28: Power Supply Cord Replacement

    R305MR 3. Apply the screw lock tight into the hole (for shaft) of the fan blade. Make sure that the fan blade rotates smooth after installation. 4. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet.

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

    R305MR 2. REINSTALL 2. Reconnect wire leads to each switch. Refer to pictorial diagram. 3. Secure latch hook (with two (2) mounting screws) to oven flange. 1. Reinstall each switch in its place. The secondary interlock/monitor switches are in the lower position and the door sensing switch is in 4.
  • Page 30 R305MR 17.Now, door screen is free. 18.Remove the door decoration from the door frame by straightening all tabs of the door decoration. 19.Now, the door decoration is free. Upper Oven Upper Hinge Oven Hinge 2. REINSTALL 1. Re-install the door screen and the door decoration to door frame. 2.

  • Page 31: Chapter 12. Circuit Diagrams

    R305MR CHAPTER 12. R305MR CIRCUIT DIAGRAMS Service Manual [1] Pictorial Diagram (Figure S-1) Figure S-1. Pictorial Diagram 12 – 1...

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

    R305MR [2] Control Unit Circuit (Figure S-2) Figure S-2. Control Unit Circuit 12 – 2...

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

    R305MR [3] Printed Wiring Board of Power Unit (Figure S-3) Figure S-3. Printed Wiring Board of Power Unit 12 – 3...

  • Page 34: Parts List

    HOW TO ORDER REPLACEMENT PARTS MICROWAVE OVEN To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER R-305MR MODEL 2. REF. NO. 3. PART NO. 4. DESCRIPTION Parts marked "*" may cause undue microwave exposure.
  • Page 35 R305MR [1] OVEN PARTS 7-10 7-10 7-10 1-13 4-15 4-12 7-10 4-16 1-12 4-13 7-10 7-10 7-11 1-11 4-14 4-17 4-12 4-10 4-18 1-10 4-12 4-11 7-10 7-10 7-10 4-12 7-10...
  • Page 36 R305MR PRICE PART PARTS CODE DESCRIPTION RANK MARK RANK [1] OVEN PARTS ELECTRIC PARTS Secondary interlock switch / door sensing switch QSW-MA085WRE0 Secondary interlock switch / door sensing switch (Interchangeable) QSW-MA147WRZZ Monitor fuse 20A and monitor switch assembly (switch V-5220Q) FFS-BA033WRKZ Monitor fuse 20A and monitor switch assembly (switch D3V-1G-2C25 Interchangeable) FFS-BA037WRKZ...
  • Page 37 R305MR [2] DOOR AND CONTROL PANEL PARTS 3-2-7 3-2-3 3-2-6 3-2-5 3-2-2 3-2-4 3-2-1...
  • Page 38 R305MR PRICE PART PARTS CODE DESCRIPTION RANK MARK RANK [2] DOOR AND CONTROL PANEL PARTS CONTROL PANEL PARTS Control unit DPWB-A486DRKZ Panel med assembly DPNLCC024WRKZ 3-2-1 Button decoration HDECQA352WRPZ 3-2-2 Open button JBTN-B316WRFZ 3-2-3 Panel decoration HDECQA353WRPZ 3-2-4 Button spring MSPRCA050WRE0 3-2-5 Graphic sheet...
  • Page 39 R305MR INDEX PRICE PART PRICE PART PARTS CODE PARTS CODE RANK MARK RANK RANK MARK RANK [ D ] [ R ] DPNLCC024WRKZ 2-3-2 RC-QZA218WRE0 1-1-5 DPWB-A486DRKZ 2-3-1 RC-QZA295WRZZ 1-1-5 RLCDSA108DRZZ 2-3-6 [ F ] FACCDA098WREZ 1-1-3 RLMPTA082WRZZ 1-1-8 RLMPTA085WRZZ 1-1-8 FACCDA099WREZ 1-1-3...
  • Page 40 EndPage COPYRIGHT © 2007 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in retrieval systems, or transmitted in anyform or by any means, electronic, mechanical, photocopying, re- cording, or other wise, without prior written permission...

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