Sharp R-306LK Service Manual
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Sharp R-306LK Service Manual

Microwave oven r-306lk; r-306lw
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See also: Operating Manual
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
SHARP CORPORATION
SERVICE MANUAL
MODELS
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 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
S2603R306KPW/

MICROWAVE OVEN

R-306LK
R-306LW
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
R306LW

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Summary of Contents for Sharp R-306LK

  • Page 1: Microwave Oven

    R306LW SERVICE MANUAL S2603R306KPW/ MICROWAVE OVEN R-306LK MODELS R-306LW 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 AND [12] Procedure K: KEY UNIT TEST ....8-5 DURING SERVICING TO AVOID POSSIBLE EXPO- [13] Procedure L: RELAY TEST......8-6 SURE TO EXCESSIVE MICROWAVE ENERGY [14] Procedure M: DEFROST TEST ....8-6 [15] Procedure N: FOIL PATTERN ON THE CHAPTER 1.

  • Page 3: Precautions To Be Observed Before And During Servicing To Avoid Possible Expo

    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

    R306LW CHAPTER 1. R306LW 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 Pro

    R306LW CHAPTER 2. R306LW 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 OVENS, R-306LK and R-306LW. 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

    R306LW CHAPTER 4. R306LW 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

    R306LW CHAPTER 5. R306LW 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 R306LW 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

    R306LW CHAPTER 6. R306LW 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 Schematic

    R306LW [2] OVEN SCHEMATIC 1. Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY TEMPERATURE FUSE 150ºC (OVEN) THERMAL CUT-OUT TEMPERATURE FUSE 145ºC (OVEN) NOTE: " " indicates components with potentials above 250V 150ºC (MAGNETRON) FUSE POWER TRANSFORMER...

  • Page 12: Description And Function Of Components

    R306LW [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

    R306LW CHAPTER 7. R306LW 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: Procedure A: Magnetron Assembly Test

    R306LW CHAPTER 8. R306LW TEST PROCEDURES Service Manual [1] Procedure 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: Procedure D: High Voltage Capacitor Test

    R306LW 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] Procedure D: HIGH VOLTAGE CAPACITOR TEST 1.

  • Page 16: Procedure G: Monitor Switch Test

    R306LW 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: Procedure I: Noise Filter Test

    R306LW 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-BA037WRKZ, even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch.

  • Page 18: Procedure K: Key Unit Test

    R306LW 7) Reconnect the power supply cord after the outer case is installed. 8) Run the oven and check all functions. 2. Control Unit. The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure K) to determine if con- trol unit is faulty.

  • Page 19: Procedure L: Relay Test

    R306LW [13] Procedure 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 R306LW 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 915Ω±10%). If any abnormal condition is detected, replace the control unit.

  • Page 21: Chapter 9. Touch Control Panel Assem

    R306LW CHAPTER 9. R306LW TOUCH CONTROL PANEL ASSEMBLY Service Manual [1] OUTLINE OF TOUCH CONTROL PANEL This circuit consists of 4-digits, 12-segments and 3-common elec- trodes using a Liquid Crystal Display. The touch control section consists of the following units as shown in 3) Power Source Circuit the touch control panel circuit.
  • Page 22 R306LW Pin No. Signal Description COM3 OUT Terminal not used. Segment data signal. Connected to LCD.The relation between signals are as follows: LSI signal (Pin No.) LCD (segment) LSI signal (Pin No.) LCD (segment) SEG 0 (26) ----------------- SEG 1 SEG 6 (32) ----------------- SEG 7 26-37 SEG0-SEG11...

  • Page 23: Servicing For Touch Control Panel

    R306LW Pin No. Signal Description Signal to sound buzzer (2.0 kHz). A: key touch sound. B: Completion sound. 0.1 sec. H : GND BZO90 L : -5V 2.0 sec. H : GND L : -5V Terminal not used. [3] SERVICING FOR TOUCH CONTROL PANEL 1.

  • Page 24: Chapter 10. Precautions For Using Lead-Free Solder

    R306LW CHAPTER 10. R306LW 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 25: Chapter 11. Component Replacement And

    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 26: Outer Case Removal

    R306LW [2] OUTER CASE REMOVAL To remove the outer case, procedure as follows. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. 1. Disconnect the power supply cord. 2. Open the oven door and block it open. 3.

  • Page 27: Positive Lock Connector (No-Case Type) Removal

    R306LW 11.Now, the magnetron is free. 4. Hold the other end of the chassis support to the magnetron with the one (1) screw. 2. REINSTALLATION 5. Reconnect the wire leads to the magnetron. Refer to “PICTORIAL DIAGRAM”. 1. Reinstall the magnetron to waveguide flange with the four (4) screws.

  • Page 28: 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 29: Power Supply Cord Replacement

    R306LW [11] POWER SUPPLY CORD REPLACEMENT 1. REMOVAL 1. Disconnect the power supply cord, and remove outer case. Power Supply Cord 2. Open the door and block it open. 3. Discharge high voltage capacitor. Screw 4. Remove the single (1) screw holding the green wire to the oven Oven Cavity Back Plate cavity back plate.

  • Page 30: Door Replacement

    R306LW 2. After adjustment, check the following. 1. In and out play of door remains less than 0.5mm when in the latched position. First check upper position of latch hook, pushing Door and pulling upper portion of door toward the oven face. Latch Hook Then check lower portion of the latch hook, pushing and pulling Door Sensing...
  • Page 31 R306LW 4. SEALER FILM 1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-7 2. Tear the backing film by pulling the adhesive tape. Upper Oven Upper Hinge Oven Hinge 3. Put the pasted side of the sealer film on the door panel Sealer film Backing film Slit choke of...

  • Page 32: Chapter 12. Circuit Diagrams

    R306LW CHAPTER 12. R306LW CIRCUIT DIAGRAMS Service Manual [1] Pictorial Diagram (Figure S-1) (RED) Figure S-1. Pictorial Diagram 12 – 1...

  • Page 33: Control Panel Circuit (Figure S-2)

    R306LW [2] Control Panel Circuit (Figure S-2) 4.7K 4.7K 4.7K CAPH CAPL BZO90 VLC0 VLC1 VLC2 COM0 COM0 COM1 COM1 COM2 COM2 INTP0 COM3 SEG1 SEG0 SEG2 SEG1 SEG3 SEG2 SEG4 SEG3 SEG5 SEG4 AVSS SEG6 SEG5 AIN0 SEG7 SEG6 AIN1 SEG8 SEG9...

  • Page 34: Printed Wiring Board (Figure S-3)

    R306LW [3] Printed Wiring Board (Figure S-3) Figure S-3. Printed Wiring Board 12 – 3...

  • Page 35: Parts List

    " are used in voltage more than 250V. CONTENTS [1] OVEN PARTS PANEL PARTS [2] DOOR AND CONTROL INDEX TOP PAD ASSEMBLY FPADBA616WRKZ DOOR PROTECTION SHEET PLASTIC SHEET (for R-306LK) SPADPA204WRE0 SPADPA616WREZ PLASTIC BAG SSAKHA034WRE0 FOAM SHEET SPAKHA012WREZ (only for R-306LK) CABINET COVER (for R-306LK)
  • Page 36 R306LW [1] OVEN PARTS 7-10 7-10 7-10 1-13 4-15 4-12 7-11 4-16 1-12 4-13 7-10 7-10 1-11 4-14 4-12 4-17 4-10 1-10 4-12 4-11 7-10 7-10 7-10 4-12 7-10...
  • Page 37 Screw : 4mm x 8mm XHTS740P08RV0 Screw : 4mm x 8mm XHTS740P08000 Screw : 4mm x 8mm 7-10 XOTS740P08000 Screw : 4mm x 8mm 7-11 XOTS840P08000 Screw : 4mm x 8mm [R-306LK] 7-11 XOTS740P08000 Screw : 4mm x 8mm [R-306LW]...
  • Page 38 R306LW [2] DOOR AND CONTROL PANEL PARTS 3-2-2 3-2-1...
  • Page 39 PARTS CODE DESCRIPTION RANK MARK RANK [2] DOOR AND CONTROL PANEL PARTS CONTROL PANEL PARTS DPWB-A352DRKZ Control unit FPNLCB898WRKZ Panel sub assy [R-306LK] FPNLCB897WRKZ Panel sub assy [R-306LW] 3-2-1 PSHEPB174WREZ Graphic sheet [R-306LK] 3-2-1 PSHEPB173WREZ Graphic sheet [R-306LW] 3-2-2 QSW-KA062DRZZ...
  • Page 40 PCUSGA614WRPZ 1-4-15 PCUSGA615WRPZ PCUSGA616WRPZ 1-4-17 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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