Sharp R-969IN Service Manual
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Sharp R-969IN Service Manual

Microwave oven with grill and convection
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TopPage
CHAPTER 1. BEFORE SERVICING
CHAPTER 2. WARNING TO SERVICE PERSONNEL
CHAPTER 3. PRODUCT SPECIFICATIONS
CHAPTER 4. APPEARANCE VIEW
CHAPTER 5. OPERATION SEQUENCE
CHAPTER 6. FUNCTION OF IMPORTANT COMPO-
NENTS
CHAPTER 7. TROUBLESHOOTING GUIDE
CHAPTER 8. TEST PROCEDURES
SERVICE MANUAL
MICROWAVE OVEN WITH
GRILL AND CONVECTION
MODELS
1
min
In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.
CONTENTS
CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY
CHAPTER 10. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 11. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
CHAPTER 12. MICROWAVE MEASUREMENT
CHAPTER 13. TEST DATA AT A GLANCE
CHAPTER 14. CIRCUIT DIAGRAMS
Parts List
S9613R969PHW/
R-969(IN)
R-969(W)
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
R969(W)

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  • Page 1 TopPage R969(W) SERVICE MANUAL S9613R969PHW/ MICROWAVE OVEN WITH GRILL AND CONVECTION R-969(IN) MODELS R-969(W) In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. CONTENTS CHAPTER 1. BEFORE SERVICING CHAPTER 9.

  • Page 2: Table Of Contents

    CONTENTS CHAPTER 1. BEFORE SERVICING CHAPTER 7. TROUBLESHOOTING GUIDE GENERAL IMPORTANT INFORMA- FOREWORD..........7-1 TION ............1-1 CHART............7-2 WARNING........... 1-1 CAUTION MICROWAVE RADIATION ..1-2 CHAPTER 8. TEST PROCEDURES Procedure A: MAGNETRON TEST ..
  • Page 3 CONTENTS GRAPHIC SHEET AND MEMBRANE SWITCH REPLACEMENT......11-2 FAN MOTOR REREPLACEMENT.....11-3 TURNTABLE MOTOR REPLACEMENT ..11-3 [10] CONVECTION MOTOR AND CONVEC- TION HEATING ELEMENT REMOVAL ..11-4 [11] POSITIVE LOCK CONNECTOR RE- MOVAL ............11-4 [12] OVEN LAMP SOCKET REMOVAL....11-5 [13] POWER SUPPLY CORD REPLACE- MENT.............

  • Page 4: Chapter 1. Before Servicing

    [1] GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer ser- vice.

  • Page 5: Caution Microwave Radiation

    R969(W) [3] CAUTION MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output microwave connections, waveguides, flanges and gaskets must be secured.

  • Page 6: Chapter 2. Warning To Service Personnel

    Indien het water nog steeds schroevedraaier kortsluit tegen het chassis. koud is, herhaalt u de allereerste drie stappen en controleer Sharp beveelt ten sterkste aan dat, voor zover mogelijk, nogmaals de aansluitingen naar de geteste onderdelen. defecten worden opgespoord wanneer de stekker uit het Wanneer alle reparaties zijn uitgevoerd en de oven weer in stopcontact is gehaald.
  • Page 7 R969(W) 2 – 2...
  • Page 8 R969(W) 2 – 3...

  • Page 9: Chapter 3. Product Specifications

    R969(W) CHAPTER 3. R969(W) PRODUCT SPECIFICATIONS Service Manual DESCRIPTION 230 Volts Power Requirements 50 Hertz Single phase, 3 wire earthed Power Consumption Microwave cooking 1.5 kW Approx 6.7A Convection cooking 2.8 kW Approx 12.2A Dual cooking Micro and Grill ---------------2.80kW Approx 12.4A Micro and Convection ----- 2.95kW Approx.

  • Page 10: Chapter 4. Appearance View Oven

    R969(W) CHAPTER 4. R969(W) APPEARANCE VIEW Service Manual [1] OVEN 1. Grill heating element 2. Oven lamp 3. Control panel 4. Shelf runners 5. Waveguide cover 6. Oven cavity 7. Coupling 8. Door seals and sealing surfaces 9. Door opening handle 10.Air-vent openings 11.Outer cabinet 12.Power cord...

  • Page 11: Chapter 5. Operation Sequence Off Condition

    R969(W) CHAPTER 5. R969(W) OPERATION SEQUENCE Service Manual [1] OFF CONDITION The circuits to the oven lamp, high voltage transformer, fan motor and turntable motor are cut off. Closing the door activates the monitored latch switch and the stop 5. When the oven door is opened during a cooking cycle, the switches switch.

  • Page 12: Grill Cooking Condition

    R969(W) NOTE: The ON/OFF time ratio does not exactly correspond to the 4. CONVECTION COOKING (by 40°C - 230°C) percentage of microwave power, because approx. 3 seconds Programme the cooking time by touching TIME keys. And then pro- are needed for heating up the magnetron filament. gramme the desired convection temperature of 40°C 230°C by touch- ing CONVECTION key.

  • Page 13: Automatic Cooking

    R969(W) [7] AUTOMATIC COOKING Automatic cooking functions automatically work out the correct cook- ing mode and cooking time and/or cooking temperature. They will cook according to the special cooking sequence. Express Cook, Express Defrost, Sensor Cook, POTATO, and INSTANT ACTION are automatic cooking functions.

  • Page 14: Chapter 6. Function Of Important Com

    R969(W) CHAPTER 6. R969(W) FUNCTION OF IMPORTANT COMPONENTS Service Manual [1] DOOR OPEN MECHANISM [5] FUSE (F1) 20A 250V The door can be opened by pulling the door handle. If the wire harness or electrical components are shortcircuited, this fuse F1 20A blows to prevent an electric shock of fire hazard. Door [6] FUSE (F2) F8A 250V (NOISE FILTER) 1.

  • Page 15: Noise Filter

    R969(W) the asymmetric rectifier is 1.7 KV. D1 and D2 of the asymmetric recti- When the convection time reaches “0”, the heating elements are deen- fier or high voltage rectifier are shorted when the each peak reverse ergized and the convection fan stops operating and the oven shuts off. voltage goes beyond the each rated peak reverse voltage.

  • Page 16: Damper Open-Close Mechanism

    R969(W) [21] DAMPER OPEN-CLOSE MECHANISM Damper position is set automatically by damper motor DM, damper switch and motor cam. These components are operated by a signal that judges if microwave cooking or convection cooking operation is selected by the CPU unit. 1.

  • Page 17: Chapter 7. Troubleshooting Guide Foreword

    R969(W) CHAPTER 7. R969(W) TROUBLESHOOTING GUIDE Service Manual [1] FOREWORD 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. These tests are given a procedure letter which will be found in the “Test Procedure”...

  • Page 18: Chart

    R969(W) [2] CHART BLOCKED COOLING FAN BLOCKED CONVECTION FAN NO POWER AT WALL OUTLET HOME FUSE OR BREAKER MIS-ADJUSTMENT OF SWITCHES BLOCKED VENTILATION OPENINGS OPENED WIRE HARNESS SHORTED WIRE HARNESS OVEN LAMP OR SOCKET POWER SUPPLY CORD AH SENSOR FOIL PATTERN ON P.W.B. RELAY RY8 RELAY RY7 RELAY RY6...

  • Page 19: Chapter 8. Test Procedures

    R969(W) CHAPTER 8. R969(W) TEST PROCEDURES Service Manual [1] Procedure A: MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS. Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron filament terminals, the meter should show a reading of less than 1 ohm.

  • Page 20: Procedure B: High Voltage Transformer Test

    R969(W) 1000g 1000g 1000g T1 C T2 C Heat up for 50 sec. [2] Procedure B: HIGH VOLTAGE TRANSFORMER TEST WARNING: High voltages and large currents are present at the secondary winding and filament winding of the power transformer. It is very dangerous to work near this part when the oven is on.

  • Page 21: Procedure E: Switch Test

    R969(W) If incorrect reading are obtained, the high voltage capacitor must be replaced. CARRY OUT 4R CHECKS. [5] Procedure E: SWITCH TEST CARRY OUT 3D CHECKS. Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table. Table: Terminal Connection of Switch Plunger Operation Common terminal to Normally open terminal...

  • Page 22: Procedure I: Noise Filter Test

    R969(W) [9] Procedure I: NOISE FILTER TEST CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, check between the terminals as described in the following table. MEASURING POINT INDICATION OF OHMMETER Between N and L Approx.

  • Page 23: Procedure N: Key Unit Test

    R969(W) 3) When touching the pads, sometimes a pad produces no signal. 2. Control Panel The following symptoms indicate a defective control unit. Before replacing the control unit perform the key unit test (Procedure N) to determine if control unit is faulty. 1) In connection with pads a) When touching the pads, a certain group of pads do not produce a signal.

  • Page 24: Procedure P: Procedures To Be Taken When The Foil Pattern On The Printed Wiring Board (Pwb) Is Open

    R969(W) [16] Procedure P: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN To protect the electronic circuits, this model is provided with a fine foil pattern added to the input circuit on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below for repair.
  • Page 25 R969(W) 5) Re-install the outer case. 6) Reconnect the oven to the power supply and check the sensor cook operation, proceed as follows: a) Fill approximately 200 milliliters (7.2 oz.) of tap water in a 1000 milliliter measuring cup. b) Place the container on the center of tray in the oven cavity. c) Close the door.

  • Page 26: Chapter 9. Touch Control Panel Assem

    R969(W) CHAPTER 9. R969(W) TOUCH CONTROL PANEL ASSEMBLY Service Manual [1] OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in 4) ACL the touch control panel circuit. A circuit to generate a signal which resets the LSI to the initial state (1) Key Unit when power is supplied.

  • Page 27: Servicing For Touch Control Panel

    R969(W) 3. Detector Circuit of Absolute Humidity Sensor Cir- cuit 620k This detector circuit is used to detect the output voltage of the absolute 300k humidity circuit to allow the LSI to control sensor cooking of the unit. R100 150k When the unit is set in the sensor cooking mode, 16 seconds clearing cycle occurs than the detector circuit starts to function and the LSI R101...
  • Page 28 R969(W) 3) Others: Hand tools 4. Other Precautions 1) Before turning on the power source of the control unit, remove the aluminium foil applied for preventing static electricity. 2) Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.

  • Page 29: Chapter 10. Precautions For Using Lead

    R969(W) CHAPTER 10. R969(W) PRECAUTIONS FOR USING LEAD-FREE SOLDER Service Manual 1. 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 30: Chapter 11. Component Replacement And Adjustment Procedure Before Operating

    4) If the outer case (cabinet) is not fitted. 4) The door is bent or warped. WARNING FOR WIRING To prevent an electric shock, take the following manners. 3) Sharp edge: 1. Before wiring, Bottom plate, Oven cavity, Waveguide flange, Chassis support and other metallic plate.

  • Page 31: High Voltage Transformer Removal

    R969(W) 4. Remove one (1) screw holding earth side terminal of the high volt- 8. Now, the high voltage rectifier assembly and the high voltage age rectifier assembly to the base plate through the capacitor capacitor should be free. holder. CAUTION: WHEN REPLACING HIGH...

  • Page 32: Fan Motor Rereplacement

    2. Remove the turntable and roller stay from the oven cavity. 3. Turn the oven over. 1. Remove the any sharp edges on the turntable motor cover and the base plate with the cutting pliers. 4. Cut the three (3) bridges holding the turntable motor cover to the base plate with cutting pliers as shown in Figure C-2(a).

  • Page 33: Convection Motor And Convection Heating Element Removal

    R969(W) Cutting pliers Turntable Screw: XHPS740P08K00 motor cover Base plate Bridges Base plate Turntable Slit motor cover Figure C-2(a) Turntable Motor Cover Replacement Figure C-2(b) Turntable Motor Cover Reinstall [10] CONVECTION MOTOR AND CONVECTION HEATING ELEMENT REMOVAL 1. CONVECTION UNIT ASSEMBLY REMOVAL 2.

  • Page 34: Oven Lamp Socket Removal

    R969(W) [12] OVEN LAMP SOCKET REMOVAL 1. CARRY OUT 3D CHECKS. ® 2. Remove the wire leads as Positive lock connector removal above. 3. Lift up the oven lamp from its retaining clips by pushing the tab of the air intake duct. Lock 4.

  • Page 35: Monitored Latch Switch, Monitor Switch And Stop Switch Removal

    R969(W) [15] MONITORED LATCH SWITCH, MONITOR SWITCH AND STOP SWITCH REMOVAL 1. CARRY OUT 3D CHECKS. 2. Remove the control panel assembly referring to “CONTROL PANEL ASSEMBLY REMOVAL”. 3. Disconnect the leads from all switches. SW2: Stop switch 4. Remove the two (2) screws holding the latch hook to the oven cav- ity.
  • Page 36 R969(W) 6. Hold the door panel to the door frame with eight (8) screws. Door stopper 7. Re-install choke cover to door panel by clipping into position. 8. Locate door panel hinge pins into cavity hinge location holes. 9. Re-install the door stopper to the chock cover. NOTE: After any service to the door;...

  • Page 37: Chapter 12. Microwave Measurement

    R969(W) CHAPTER 12. R969(W) MICROWAVE MEASUREMENT Service Manual After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the following leakage test must be per- formed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven. REQUIREMENT The safety switch must prevent microwave radiation emission in excess of 5mW/cm at any point 5cm or more from external surface of the oven.

  • Page 38: Chapter 13. Test Data At A Glance

    R969(W) CHAPTER 13. R969(W) TEST DATA AT A GLANCE Service Manual PARTS SYMBOL VALUE / DATA Fuse 20A 250V Fuse (Noise filter) Thermal cut-out 125°C Off Thermal cut-out TC2, TC3 170°C Off / 155°C On Thermistor Approx. 359.9 kΩ - 152 kΩ at 20°C - 30°C Grill heating element Approx.

  • Page 39: Chapter 14. Circuit Diagrams

    R969(W) CHAPTER 14. R969(W) CIRCUIT DIAGRAMS Service Manual [1] Oven Schematic SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. PLUGGED IN OVEN. 3. NOTHING APPEARS ON DIS PLAY. NOTE: " " indicates components with potentials above 250V CONTROL UNIT SW4: SW2: DAMPER...
  • Page 40 R969(W) SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2 " . O" APPEARS ON DISPLAY. NOTE: " " indicates components with potentials above 250V CONTROL UNIT SW4: SW2: DAMPER STOP THERMISTOR SWITCH SWITCH ASYMMETRIC N.O . COM. COM. N.O. RECTIFIER N.C.
  • Page 41 R969(W) SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. COOKING TIME ENTERED. 3. GRILL MODE SELECTED. 4. STRAT KEY TOUCHED. NOTE: " " indicates components with potentials above 250V CONTROL UNIT DAMPER STOP THERMISTOR SWITCH SWITCH ASYMMETRIC COM. N.O . COM.
  • Page 42 R969(W) SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. COOKING TIME ENTERED. 3. DUAL MODE PAD TOUCHED ONCE. 4. CONVECTION TEMPERATURE SELECTED. 5. MICROWAVE POWER LEVEL SELECTED. 6. STRAT KEY TOUCHED. NOTE: " " indicates components with potentials above 250V CONTROL UNIT SW4:...

  • Page 43: Pictorial Diagram (Figure S-1)

    R969(W) [2] Pictorial Diagram (Figure S-1) Figure S-1. Pictorial Diagram 14 – 5...

  • Page 44: Power Unit Circuit

    R969(W) [3] Power Unit Circuit OVEN S1NB10 WH1-4 THERMISTOR WH1-3 R4 510 1w WH1-6 Q1 2SB1238 R5 3.3k WH1-9 BUZZER AC230V R3 680 1w 50Hz WH2-2 WH1-10 WH1-5 POWER WH1-11 CONTROL FAN MOTOR WH1-8 CONVECTION WH1-7 MOTOR DAMPER WH2-4 MOTOR R6 130 1w OVEN LAMP WH2-3...

  • Page 45: Control Unit Circuit

    R969(W) [4] Control Unit Circuit Figure S-3. CPU Unit Circuit 14 – 7...

  • Page 46: Indicator Circuit

    R969(W) [5] Indicator Circuit Figure S-4. Indicator Circuit 14 – 8...

  • Page 47: Key Unit Circuit

    R969(W) [6] Key Unit Circuit Figure S-5. Key Unit Circuit 14 – 9...

  • Page 48: Printed Wiring Board

    R969(W) [7] Printed Wiring Board VRS1 POWER CONT Figure S-6. Printed Wiring Board of Power Unit 14 – 10...

  • Page 49: Parts List

    R969(W) PARTS LIST MICROWAVE OVEN WITH GRILL AND CONVECTION HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly, please furnish the following information. R-969(IN) MODELS 1. MODEL NUMBER 2. REF. NO. 3. PART NO. R-969(W) 4. DESCRIPTION Parts marked "*"...
  • Page 50 R969(W) [1] OVEN PARTS 7-16 4-17 7-10 4-25 4-18 4-20 7-17 7-13 4-27 7-16 4-10 4-22 7-16 4-39 4-21 4-19 4-13 4-23 4-15 7-17 7-12 4-16 7-16 7-13 4-24 4-14 4-11 7-16 7-11 4-26 7-12 4-30 4-28 7-16 7-16 7-16 4-37 4-38 7-14...
  • Page 51 R969(W) PRICE PART PARTS CODE DESCRIPTION RANK MARK RANK [1] OVEN PARTS ELECTRIC PARTS High voltage capacitor RC-QZA219WRE1 Convection heating element RHET-A269WRZ1 Convection motor RMOTEA415WRZ1 Damper motor RMOTDA269WRZ1 Fuse 20A QFS-BA012WRZZ Fan motor RMOTEA002URE2 Grill heating element RHET-A231WRZ1 Magnetron RV-MZA264WRE1 Oven lamp RLMPTA066WRE1 Monitored latch switch...
  • Page 52 R969(W) PRICE PART PARTS CODE DESCRIPTION RANK MARK RANK [1] OVEN PARTS Ring XRES740-06000 Washer: 4mm x 1.0mm XWSUW40-10000 Screw: 4mm x 25mm XEPS740P25000 Screw : 3mm x 6mm XHPS730P06000 Screw: 4mm x 10mm XJPS740P10X00 7-10 XHPS740P06000 Screw: 4mm x 6mm 7-11 Screw : 4mm x 10mm XOTWW40P10000...
  • Page 53 R969(W) PRICE PART PARTS CODE DESCRIPTION RANK MARK RANK [2] CONTROL PANEL AND DOOR PARTS CONTROL PANEL PARTS CPU unit DPWB-A410DRKZ Power unit DPWBFA226URK0 C/P sub assy [R-969(W)] DPNLCB991WRKZ C/P sub assy [R-969(IN)] DPNLCB990WRKZ 3-3-1 Key sheet [R-969(W)] PSHEPB206WREZ 3-3-1 Key sheet [R-969(IN)] PSHEPB205WREZ 3-3-2...
  • Page 54 R969(W) INDEX PRICE PART PRICE PART PARTS CODE PARTS CODE RANK MARK RANK RANK MARK RANK PREFHA001URP0 1-4-15 [ C ] PSHEPB205WREZ 2-3-3-1 CDORFA050WRKZ 2-5-1 PSHEPB206WREZ 2-3-3-1 CDORFB049WRKZ 2-5-1 PSKR-A010URP0 1-4-11 [ D ] PSKR-A012URP0 1-4-28 DDORFB260WRKZ 2-5-1-2 PSKR-A013URP0 1-4-21 DOVN-A024URK0 1-4-4 PSKR-A014URP0...
  • Page 56 EndPage COPYRIGHT © 2006 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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