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Sharp R-320BB Service Manual

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BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2
FOREWORD AND WARNING ............................................................................................................................... 3
PRODUCT SPECIFICATIONS .............................................................................................................................. 4
GENERAL INFORMATION ................................................................................................................................... 4
OPERATION .......................................................................................................................................................... 6
TROUBLESHOOTING GUIDE .............................................................................................................................. 9
TEST PROCEDURE ............................................................................................................................................ 10
TOUCH CONTROL PANEL ................................................................................................................................. 20
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 26
PICTORIAL DIAGRAM ........................................................................................................................................ 33
POWER UNIT CIRCUIT ...................................................................................................................................... 34
CPU UNIT CIRCUIT ............................................................................................................................................ 35
PRINTED WIRING BOARD ................................................................................................................................. 36
PARTS LIST ........................................................................................................................................................ 37
PACKING AND ACCESSORIES ......................................................................................................................... 41
SHARP CORPORATION
SERVICE MANUAL
MODELS
In the interest of user-safety the oven should be restored to its original
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
current, contact with following parts may result in a severe,
possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Recti-
fier Assembly, High Voltage Harness etc..)

TABLE OF CONTENTS

This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
MICROWAVE OVEN
R-320BB
R-320BK
R-320BW
R-320BB
R-320BK
R-320BW
S2805R320BPW/
Page

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Summary of Contents for Sharp R-320BB

  • Page 1: Table Of Contents

    R-320BB R-320BK R-320BW SERVICE MANUAL S2805R320BPW/ MICROWAVE OVEN R-320BB MODELS R-320BK R-320BW In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens con-...

  • 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-320BB R-320BK R-320BW 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-320BB R-320BK R-320BW 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...
  • Page 5 MICROWAVE OVEN R-320BB / R-320BK / R-320BW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-320BB, R-320BK, R-320BW. It is recommended that service personnel carefully study the entire...

  • Page 6: General Information

    R-320BB R-320BK R-320BW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 11-7/8" Depth 15-7/8" Cooking Cavity Dimensions Width 13-3/4"...

  • Page 7: Oven Diagram

    R-320BB R-320BK R-320BW A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord. Grounded 3-Pronged Plug Receptacle Box Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact a qualified...

  • Page 8: Operation

    R-320BB R-320BK R-320BW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during that it will function in the following sequence. oven operation. (1) When the door opens from the closed position, the primary interlock relay (RY2) and secondary interlock OFF CONDITION switch open their contacts.
  • Page 9 R-320BB R-320BK R-320BW enough steam from the food, it relays the information to its 3. Sensor detects moisture and humidity and calculates microprocessor which will calculate the remaining cooking cooking time and variable power. time and power level needed for best results. When the food Cooking Sequence.

  • Page 10: Description And Function Of Components

    R-320BB R-320BK R-320BW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. COOKING TIME PROGRAMMED 3. VARIABLE COOKING CONTROL "HIGH" 4. "START" PAD TOUCHED THERMAL MONITOR THERMAL CUT-OUT (OVEN) FUSE 20A CUT-OUT (MG.) COM. POWER N.O. TRANSFORMER (RY-1) (RY-2) PRIMARY...

  • Page 11: Troubleshooting Guide

    R-320BB R-320BK R-320BW PRIMARY INTERLOCK RELAY (RY2), RELAY the monitor switch closes. (RY1), SECONDARY INTERLOCK SWITCH 2. If the wire harness or electrical components are short- AND MONITOR SWITCH FOR PROPER OP- circuited, this monitor fuse blows to prevent an electric ERATION.

  • Page 12: Test Procedure

    R-320BB R-320BK R-320BW CK = Check / RE = Replace RE RE A B C D E F F G H RE RE CK I CKCK CK J K L M N TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows...
  • Page 13 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. 5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.
  • Page 14 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE RECTIFIER 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. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading.
  • Page 15 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 8. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT. SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case.
  • Page 16 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER continuity of the monitor circuit. 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.
  • Page 17 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7) Reconnect the power supply cord after the outer case is installed. 8) 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 18 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault. 5. Reconnect all leads removed from components during testing.
  • Page 19 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER FOIL PATTERN ON THE PRINTED WIRING BOARD TEST To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse.
  • Page 20 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER AH SENSOR TEST Checking the initial sensor cooking condition WARNING : The oven should be fully assembled before following procedure. (1) The oven should be plugged in at least two minutes before sensor cooking.
  • Page 21 R-320BB R-320BK R-320BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CHECKING CONTROL UNIT (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 sensor connector that is mounted to control panel.

  • Page 22: Touch Control Panel

    R-320BB R-320BK R-320BW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. 3) Power Source Circuit This circuit generates voltages necessary in the control (1) Key Unit unit from the AC line voltage.
  • Page 23 R-320BB R-320BK R-320BW LSI(IZA865DR) The I/O signal of the LSI(IZA865DR) is detailed in the following table. Pin No. Signal Description VL2-VL1 Power source voltage input terminal. Standard voltage for LCD. AN7-AN4 Terminal to change cooking input according to the Model.
  • Page 24 R-320BB R-320BK R-320BW Pin No. Signal Description Terminal not used. Connected to VC. 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 25 R-320BB R-320BK R-320BW Pin No. Signal Description SEG20 Terminal not used. 53-59 Segment data signal. SEG19-SEG13 Signal similar to SEG27. SEG12 Terminal not used. 61-67 Segment data signal. SEG11-SEG5 Signal similar to SEG27. SEG4 Terminal not used. 69-72 Segment data signal.
  • Page 26 R-320BB R-320BK R-320BW ABSOLUTE HUMIDITY SENSOR CIRCUIT sensor cooking mode, 16 seconds clearing cycle occurs (1) Structure of Absolute Humidity Sensor than the detector circuit starts to function and the LSI The absolute humidity sensor includes two thermistors observes the initial voltage available at its AN1 terminal.
  • Page 27 R-320BB R-320BK R-320BW TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components 4) Re-install the outer case (cabinet). 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 28: 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 29: Pictorial Diagram

    R-320BB R-320BK R-320BW 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. NOTE: When replacing the outer case, the 2 special Special screw Torx screws must be reinstalled in the same locations.
  • Page 30 R-320BB R-320BK R-320BW MAGNETRON REMOVAL Removal 4. Reconnect the wire leads to the magnetron. Refer to 1. Disconnect the power supply cord and remove outer case. "PICTORIAL DIAGRAM" on page 33. 2. Open the door and block it open. 5. Re-install outer case and check that the oven is operating 3.

  • Page 31: Power Unit Circuit

    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 32 R-320BB R-320BK R-320BW 7. Install the fan duct assembly to the oven cavity with the 9. Install the magnetron and the chassis support to the one (1) screw. oven cavity, referring to "Re-install of MAGNETRON 8. Insert the snap of the main wire harness to the hole of the REMOVAL".
  • Page 33 R-320BB R-320BK R-320BW DOOR REPLACEMENT REMOVAL 1. Disconnect the power supply cord. 2. Push the open button and open the door slightly. 3. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and door frame as shown in Figure C-7 to free engaging parts.
  • Page 34 R-320BB R-320BK R-320BW Upper oven hinge Door panel Lower oven hinge Lower oven hinge Choke cover Figure C-8. Door Replacement SEALER FILM Installation 1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-9.
  • Page 35 R-320BB R-320BK R-320BW RECTIFIER H.V.
  • Page 36 R-320BB R-320BK R-320BW LD1 LD2 LD3 LD4 LD5 LD1-LD5 WH-1 R4 27 Q2 2SB1238 D1-D4 11ES1 R5 4.7k – – 2SB1238 R2 680 1/2w TURNTABLE MOTOR BUZZER OVEN LAMP N.O. MOTOR TURNTABLE R6 3.3k MOTOR OVEN LAMP MOTOR MICRO N.O.
  • Page 37 R-320BB R-320BK R-320BW SEG7 40 P20 SEG6 39 P21 SEG5 38 P22 SEG4 37 P23 SEG3 36 P24 SEG2 35 P25 SEG1 34 P26 SEG0 33 P27 32 VSS VREF 31 XOUT 30 XIN AVSS COM3 29 P70 COM2 28 P71...
  • Page 38 R-320BB R-320BK R-320BW WH - 1 (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-4. Printed Wiring Board of Power Unit...

  • Page 39: Cpu Unit Circuit

    FPNLCB358WRK0 Control panel frame with key unit [R-320BK] 3- 3 FPNLCB359WRK0 Control panel frame with key unit [R-320BW] 3- 3 FPNLCB372WRK0 Control panel frame with key unit [R-320BB] 3- 3-1 FUNTKA852WRE0 Key unit [R-320BK] 3- 3-1 FUNTKA853WRE0 Key unit [R-320BW]...
  • Page 40 To have your order filled promptly and correctly, please furnish the following information. 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.
  • Page 41 R-320BB R-320BK R-320BW OVEN AND CABINET PARTS 1-11 1-10 4-17 4-20 1-15 1-13 4-16 4-10 4-21 4-22 6-10 4-15 4-12 4-14 1-12 4-23 4-11 4-19 1-14 4-13...
  • Page 42 R-320BB R-320BK R-320BW 3 - 5 3-1F CONTROL PANEL PARTS 3 - 4 3 - 2 3 - 5 3 - 3 3-3-1 3 - 5 DOOR PARTS 3 - 1 3-3-3 3-3- 2 4-18 MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.

  • Page 43: Packing And Accessories

    PLASTIC BAG SSAKHA034WRE0 6- 8 INSTRUCTION BOOK & PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA342WRK0 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA397WRE0 OVEN CAVITY Not replaceable items. PACKING CASE SPAKCD024WRE0 [R-320BK] SPAKCD025WRE0 [R-320BW] SPAKCD064WRE0 [R-320BB]...
  • Page 44 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. '98 SHARP CORP. (2S2.530E) Printed in U.S.A...

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