Sharp R-520DK Service Manual

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Operation manual (24 pages)

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Page 1: Table Of Contents
LSI UNIT CIRCUIT ............................... 37 PRINTED WIRING BOARD ..........................40 PARTS LIST ................................ 41 PACKING AND ACCESSORIES ......................... 43 This document has been published to be used for after SHARP CORPORATION sales service only. The contents are subject to change without notice.
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 -520DK R-520DW R -530DK R-530DW 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 - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW 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 by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm...
Page 5: Foreword And Warning
PRODUCT DESCRIPTION MICROWAVE OVEN R-520DK/R-520DW/ R-530DK/ R-530DW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-520DK, R-520DW, R-530DK, R- OPERATION 530DW. It is recommended that service personnel carefully study the entire...
Page 6: Product Specifications
P-10, 10 PERCENT ........... approx. 10% of Full Power P-0, 0 PERCENT ......No power throughout the cooking time REHEAT SENSOR pad, CUSTOM HELP pad, INSTANT ACTION pads R-520DK SENSOR COOK pads, COMPU DEFROST pads R-520DW Number selection pads, Kitchen Timer pad, Clock pad,...
Page 7: Oven Diagram
See note Clock These features are automati- Timer Plus cally enabled when the door STOP POWER Stop Start Power LEVEL CLEAR See note Level is opened and closed or the Clear Touch On STOP/ CLEAR pad is pressed. R-520DK/DW R-530DK/DW...
Page 8: Operation
(2) When the door is closed from the open position, the control unit. (Figure O-1). monitor switch contacts open first. Then the contacts of 1. The display will show "SHARP SIMPLY THE BEST the secondary interlock switch and door sensing switch PRESS CLEAR AND PRESS CLOCK".
Page 9 3. Sensor detects moisture and humidity and calculates cooking time and variable power. Cooking Sequence. 1. Touch one of the SENSOR pads (for R-520DK/DW). Touch one of the SENSOR pads and then touch the Start pad (for R-530DK/DW). NOTE: The oven should not be operated on SENSOR immediately after plugging in the unit.
Page 10: Oven Schematic-Cooking Condition
R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. NOTE: Indicates components with potential above 250 V. 2. CLOCK APPEARS ON DISPLAY. MAGNETRON MONITOR TEMP.
Page 11: Description And Function Of Components
R -520DK R-520DW R -530DK R-530DW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM open, the monitor fuse blows simultaneously with closing of the monitor switch contacts. The door is opened by pushing the open button on the CAUTION: BEFORE REPLACING A BLOWN MONITOR control panel, refer to the Figure D-1.
Page 12: Troubleshooting Guide
R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW 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.
Page 13 R -520DK R-520DW R -530DK R-530DW CK = Check / RE = Replace TEST PROCEDURE A B C D E E F F G H J K L M N RE RE RE RE CK CK CK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION...
Page 14: Test Procedure
R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3.
Page 15 R -520DK R-520DW R -530DK R-530DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case. 2.
Page 16 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8.
Page 17 R -520DK R-520DW R -530DK R-530DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit.
Page 18 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5) Run the oven and check all functions. The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all.
Page 19 (1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) For R-520DK/DW, close the door, touch the " STEAKS / CHOPS " pad once. For R-530DK/DW, close the door, touch the Compu Defrost pad thtee times and touch the number...
Page 20 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (3) The oven is in Compu Defrost cooking condition. (4) The oven will operate as follows WEIGHT 1ST STAGE 2ND STAGE...
Page 21 (2) Place the container on the center of tray in the oven cavity. (3) Close the door. (4) For R-520DK/DW, touch REHEAT SENSOR pad once. Now, the oven is in the sensor cooking condition and “REHEAT” "SENSOR" will appear in the display.
Page 22 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the door. 9-4. For R-520DK/DW, touch REHEAT SENSOR pad once. For R-530DK/DW, touch Sensor reheat pad and touch Start pad. 9-5. The control panel is in automatic Sensor operation.
Page 23: Touch Control Panel
A switch to “tell” the LSI if the door is open or closed. initial state when power is supplied. 8) Back Light Circuit 2) Indicator Circuit For R-520DK/DW For R-520DK/DW A circuit to drive the back light (Light emitting diodes This circuit consists of 36 segments and 3 common LD1- LD4).
Page 24 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW LSI(IXA020DR) : R-520DK/DW The I/O signal of the LSI(IXA020DR) is detailed in the following table. Pin No. Signal Description P26-P27 Terminal not used.
Page 25 R -520DK R-520DW R -530DK R-530DW Pin No. Signal Description P114 Key strobe signal. Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102 and P103 terminal while one of G4 line keys on key matrix is touched. P115 Key strobe signal.
Page 26 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW Pin No. Signal Description To input signal which communicates the door open/close information to LSI. Door close "H" level signal (0V). Door open "L" level signal (-5V). COM0 Common data signal: COM2.
Page 27 R -520DK R-520DW R -530DK R-530DW Pin No. Signal Description Terminal not used. RESET Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Temporarily set "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level.
Page 28 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW Pin No. Signal Description 28-31 ANI0-ANI3 Terminal to change cooking input according to the Model. By using the A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant.
Page 29 R -520DK R-520DW R -530DK R-530DW ABSOLUTE HUMIDITY SENSOR CIRCUIT increase the voltage available at ANI5 terminal of the (1) Structure of Absolute Humidity Sensor LSI. The absolute humidity sensor includes two thermistors Then the LSI observes that voltage at ANI5 terminal and as shown in the illustration.
Page 30 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW TOUCH CONTROL PANEL SERVICING 4) Re-install the outer case (cabinet). 1. Precautions for Handling Electronic Components 5) Re-connect the power supply cord after the outer This unit uses CMOS LSI in the integral part of the case is installed.
Page 31: Component Replacement And Adjustment Procedure
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 32 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CA- PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
Page 33 4. Where the corners have been snipped off bend corner 7. Now the turntable motor is free. areas flat. No sharp edges must be evident after removal 8. After replacement use the one (1) screw to fit the of the turntable motor cover.
Page 34 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW COOLING FAN MOTOR REMOVAL REMOVAL CAUTION: 1. Disconnect the power supply cord and then remove * Do not reuse the removed fan blade because the outer case.
Page 35 R -520DK R-520DW R -530DK R-530DW 3. Secure latch hook (with two (2) mounting screws) to and check continuity of the monitor circuit. Refer to oven flange. chapter "Test Procedure" and Adjustment procedure. 4. Make sure that the monitor switch is operating properly DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1.
Page 36 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW 6. Re-install choke cover to door panel by pushing. SEALER FILM Note: After any service to the door; Installation 1. Put the adhesive tape on the backing film of the sealer (A) Make sure that door sensing switch and secondary film as shown in Fig.
Page 37: Pictorial Diagram
R -520DK R-520DW R -530DK R-530DW...
Page 38: Power Unit Circuit
R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW D1-4 11ES1 CN-A – OVEN LAMP FAN MOTOR TURNTABLE MOTOR BUZZER OVEN LAMP FAN MOTOR TURNTABLE MOTOR (CN-D) MICRO MICRO DOOR SENSING SWITCH CN-C (CN-B)
Page 39: Lsi Unit Circuit
R -520DK R-520DW R -530DK R-530DW COM2 COM0 ANI2 COM1 ANI1 COM1 COM2 COM0 ANI0 SEG0 COM3 AVSS SEG1 BIAS P117 SEG2 VLC0 P116 SEG3 VLC1 P115 SEG4 VLC2 P114 SEG5 VSS0 P113 SEG6 P112 SEG0 SEG7 P111 SEG8 P110 SEG9 SEG10 SEG11...
Page 40 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW COM0 ANI2 COM1 ANI1 COM2 ANI0 COM3 AVSS P117 BIAS VLC0 P116 VLC1 P115 VLC2 P114 VSS0 P113 P112 P111 P110 INTP1 INTP0 RESET VDD1...
Page 41 R -520DK R-520DW R -530DK R-530DW SENSOR DEFROST COOK HELP SEG9 SEG35 SEG8 SEG36 SEG7 SEG37 SEG6 SEG38 SEG5 SEG39 SEG4 COM16 SEG3 COM15 /50v SEG2 COM14 SEG1 COM13 C129 SEG0 COM12 COM7 COM11 COM6 COM10 COM5 COM9 COM4 COM8 COM3 COM2 COM1...
Page 42: Printed Wiring Board
R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW (CN - C) CN - C CN - B CN - A (J1) (CN - D) (D10) Figure S-5. Printed Wiring Board of Power Unit...
Page 43: Parts List
VRS1 RH-VZA032DRE0 Varistor (10G471K) VHEHZ161///-1 Zener diode (HZ16-1) [R-530DK/DW] 3- 2 FPNLCB299MRK0 Control panel frame with key unit [R-520DK] 3- 2 FPNLCB300MRK0 Control panel frame with key unit [R-520DW] 3- 2 FPNLCB301MRK0 Control panel frame with key unit [R-530DK] 3- 2...
Page 44 LX-CZA038WRE0 Special screw 7- 8 XHTSD40P08RV0 Screw : 4mm x 8mm 7- 9 XOTSF40P12000 Screw : 4mm x 12mm [R-520DK] 7- 9 XOTSF40P12000 Screw : 4mm x 12mm [R-530DK] 7- 9 XOTSE40P12000 Screw : 4mm x 12mm [R-520DW] 7- 9...
Page 45: Packing And Accessories
1. MODEL NUMBER 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. PACKING AND ACCESSORIES TOP PAD ASSEMBLY...
Page 46 R - 5 2 0 D K R -520DW R - 5 3 0 D K R -530DW 7-10 OVEN AND CABINET PARTS 7-10 1-10 1-15 7-11 4-11 1-14 1-11 4-10 1-12 1-13 7-11 4-13 4-12...
Page 47 R -520DK R-520DW R -530DK R-530DW CONTROL PANEL PARTS 3-2-1 3-2-1 R-530DK/DW R-520DK/DW 3-2-2 3-2-2 3-2-3 3-2-3 DOOR PARTS 5-1-1 5-1-2 MISCELLANEOUS Actual wire harness may be different from illustration.
Page 48 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. 2000 SHARP CORP. (2S2.530E) Printed in U.S.A...

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Sharp R-520DK Service Manual

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