Sharp R-21JV-F Service Manual
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Sharp R-21JV-F Service Manual

Sharp R-21JV-F Service Manual

Light duty commercial microwave ovens
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1000 W/ R-21J V
R-21JV-F
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 ................................................................................................................................. 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 26
PICTORIAL DIAGRAM ........................................................................................................................................ 33
CONTROL PANEL CIRCUIT .............................................................................................................................. 34
PRINTED WIRING BOARD ................................................................................................................................. 36
PARTS LIST ........................................................................................................................................................ 37
PACKING AND ACCESSORIES ......................................................................................................................... 42
SHARP CORPORATION
SERVICE MANUAL
MODELS
ON
DEF
NO. X2 CHECK
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 contain
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 Rectifier Assembly, High
Voltage Harness etc..)

TABLE OF CONTENTS

LIGHT DUTY
COMMERCIAL
MICROWAVE OVENS
R-21HT-F
R-21JV-F
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-21HT-F
R-21JV-F
S0515R21HTPF/
Page

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  • Page 1: Table Of Contents

    CONTROL PANEL CIRCUIT ..........................34 PRINTED WIRING BOARD ..........................36 PARTS LIST ................................ 37 PACKING AND ACCESSORIES ......................... 42 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 the Food and Drug Administration's Center for Devices and Radiological Health immediately.

  • Page 3: Warning To Service Personnel

    R-21HT-F R-21JV-F 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-21HT-F R-21JV-F 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 at any point 5cm or more from the external surface of the oven.

  • Page 5: Foreword And Warning

    MICROWAVE OVEN GENERAL INFORMATION R-21HT-F/ R-21JV-F FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-21HT-F and R-21JV-F. It is recommended that service personnel carefully study the entire text of...

  • Page 6: Product Specifications

    R-21HT-F R-21JV-F SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 14 Amperes 60 Hertz / Single phase, 3 wire grounded Power Output 1000 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" (520mm) Height 12-1/8" (309mm) Depth 16" (406mm) NOTE: Internal capacity is calculated by measuring Cooking Cavity Dimensions...

  • Page 7: Oven Diagram

    R-21HT-F R-21JV-F Electrical Requirements The electrical requirements are a 120 volt 60 Hz, AC only, Grounded 3-Pronged Plug 15 amp. or more protected electrical supply. It is recommended that a Receptacle Box separate circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances.

  • Page 8: Operation

    R-21HT-F R-21JV-F OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during (2) When the door is closed from the open position, the monitor oven operation. switch contacts open first. Then the contacts of the secondary interlock switch and door sensing switch close and contacts OFF CONDITION of the relay (RY3) open.
  • Page 9 R-21HT-F R-21JV-F SCHEMATIC NOTE: Indicates components with potential above 250 V. NOTE: CONDITION OF OVEN 1. DOOR CLOSED. APPEARED. THERMAL THERMAL CUT-OUT CUT-OUT NOISE FILTER 125˚C (OVEN) 145˚C (MAG.) POWER TRANSFORMER AC120V 60 Hz CAPACITOR 0.94 µF CONTROL UNIT 2400V DOOR SENSING SWITCH OVEN...

  • Page 10: Description And Function Of Components

    R-21HT-F R-21JV-F DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM monitor fuse blows simultaneously with closing of the The door is opened by grasping the door handle, refer to Figure monitor switch contacts. D-1. CAUTION: BEFORE REPLACING A BLOWN MONITOR When the door handle is grasped, the handle lever is pulled.

  • Page 11: Troubleshooting Guide

    R-21HT-F R-21JV-F 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. Many of the possible causes of trouble will require that a specific test be performed.

  • Page 12: Test Procedure

    R-21HT-F R-21JV-F CK = Check / RE = Replace TEST PROCEDURE A B C D E F F G H J K L M CK RE RE RE RE RE CK CK CK I POSSIBLE CASE DEFECTIVE PARTS PROBLEM CONDITION Home fuse or circuit breaker blows when power cord is plugged into wall outlet.
  • Page 13 R-21HT-F R-21JV-F 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. 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 14 R-21HT-F R-21JV-F 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-21HT-F R-21JV-F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER SECONDARY INTERLOCK SWITCH 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 switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch.
  • Page 16 R-21HT-F R-21JV-F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN MONITOR FUSE 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. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...
  • Page 17 R-21HT-F R-21JV-F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 1. Key Unit. NOTE ; 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) Check key unit ribbon connection before replacement. 5) Reconnect all leads removed from components during testing.
  • Page 18 R-21HT-F R-21JV-F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER make sure the door sensing switch is closed (either close the door or short the door sensing switch connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact.
  • Page 19 R-21HT-F R-21JV-F 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. 1.

  • Page 20: Touch Control Panel

    R-21HT-F R-21JV-F TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units 2. Key Unit as shown in the touch control panel circuit. The key unit is composed of a matrix circuit in which when a key it touched, one of signals P30--P34 (1) Control Unit generated by the LSI, is passed through the key and...
  • Page 21 R-21HT-F R-21JV-F DESCRIPTION OF LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description Power source voltage: +5V. VC voltage of power source circuit input. VEE/AVSS Connected to GND VREF Connected to VC. (+5V) AN7-AN6 Terminal not used.
  • Page 22 R-21HT-F R-21JV-F Pin No. Signal Description 22-24 P44-P42 Digit selection signal. Signal similar to P45. INT1 Signal synchronized with commercial power source frequency. H : +5V This is basic timing for all time processing of LSI. L : GND 16.7 msec Connected to GND through resistor.
  • Page 23 R-21HT-F R-21JV-F Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G5 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section.
  • Page 24 R-21HT-F R-21JV-F TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components 6) Run the oven and check all functions. This unit uses CMOS LSI in the integral part of the circuits. A. On some models, the power supply cord between the When handling these parts, the following precautions should touch control panel and the oven itself is so short that the be strictly followed.
  • Page 25 R-21HT-F R-21JV-F PRECAUTIONS FOR USING LEAD-FREE SOLDER 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. Example: Sn-Ag-Cu Indicates lead-free solder of tin, silver and copper.
  • Page 26 R-21HT-F R-21JV-F 3) Practice for inputting total using times (Ex. 310000 times). 5) Practice for cancelling total using times and total operation time (user and service) and all other counter..Flashing / ... 0.1sec BUZZER ... Flashing / ... 0.1sec BUZZER DISPLAY INDICATOR PHONE (Door close)
  • Page 27 R-21HT-F R-21JV-F DISPLAY PAUSE End of each stage After 10% of total cooking time is passed After 90% of total cooking time is passed START There is no pause 2) To check the constants of Express defrost. " ": Flicker / : 0.1 sec BUZZER DISPLAY INDICATOR...

  • Page 28: Component Replacement And Adjustment Procedure

    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 precau- 3) Sharp edge: tions. Bottom plate, Oven cavity, Waveguide flange, Chassis 1. Before wiring, support and other metallic plate.

  • Page 29: Magnetron Removal

    R-21HT-F R-21JV-F HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL To remove the components, proceed as follows. 9. Remove one (1) screw holding the capacitor holder to the 1. Disconnect the power supply cord and then remove outer oven cavity rear plate. case.

  • Page 30: Antenna Motor Removal

    R-21HT-F R-21JV-F ® POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL Terminal 1. Disconnect the power supply cord and then remove outer case. Positive lock® connector 2. Open the door and block it open. 3. Discharge high voltage capacitor. Push ® 4. Push the lever of positive lock connector.

  • Page 31: Power Supply Cord Replacement

    R-21HT-F R-21JV-F POWER SUPPLY CORD REPLACEMENT Removal 7. Now, the power supply cord is free. 1. Disconnect the power supply cord and then remove outer case. Re-install 2. Open the door and block it open. 1. Insert the moulding cord stopper of power supply cord into 3.

  • Page 32: Door Parts Removal

    R-21HT-F R-21JV-F After adjustment, check the following. 1. In and out play of door remains less than 0.5mm when in the Latch Head Handle latched position. First check upper position of latch hook, Lever pushing and pulling upper portion of door toward the oven Latch Hook face.

  • Page 33: Pictorial Diagram

    R-21HT-F R-21JV-F (B) An approved microwave survey meter should be used Upper to assure compliance with proper microwave radiation Oven emission limitation standards. (Refer to Microwave Hinge Measurement Procedure.) Upper Oven Hinge After any service, make sure of the following : 1.

  • Page 34: Installation Of Ceramic Shelf

    R-21HT-F R-21JV-F Flat face Antenna motor shaft Flat face Centre Antenna holder Hole Stirrer antenna assembly Stirrer antenna Stirrer antenna's big blade Antenna motor shaft Figure C-9. Derection of Antenna Motor Shaft and Oven cavity bottom plate Stirrer Antenna Assembly Antenna holder Antenna holder Stirrer antenna...
  • Page 35 R-21HT-F R-21JV-F...

  • Page 36: Control Panel Circuit

    R-21HT-F R-21JV-F...
  • Page 37 R-21HT-F R-21JV-F...

  • Page 38: Printed Wiring Board

    R-21HT-F R-21JV-F (C83) (C82) (C81) (C80) (R91) (R90) (JJ) (R89) (R66) (C64) (R69) (JH) (R65) (R68) (C60) (R60) (R62) (C101) (C60) (J5) (JG) (JD) (R61) (J6) (JE) (R64) (R63) (C63) (CN - H) (JA) (R1) (ZD1) (R2) (R101) (14) (15) (16) (CT1) (17)

  • Page 39: Parts List

    R-21HT-F R-21JV-F PARTS LIST ∆ Note: The parts marked “ ” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE ELECTRIC PARTS 1- 1 FFS-BA015WRK0 Monitor fuse(20A) and monitor switch(V-5220D-070) assembly 1- 2 QSW-MA051WRE0 Door sensing switch...
  • Page 40 R-21HT-F R-21JV-F REF. NO. PART NO. DESCRIPTION Q'TY CODE R80-88 VRD-B12EF472J Resistor 4.7 ohm 1/4W RRLY-A101DRE0 Relay (VRB12) RRLY-A094DRE0 Relay (OMIF-S-112LM) RALM-A014DRE0 Buzzer (PKM22EPT) RTRNPA094DRE0 Touch control transformer VRS1 RH-VZA032DRE0 Varistor (10G471K) VHEHZ4A2///-1 Zener diode (HZ4A2) 3- 2 FPNLCB388WRK0 Control panel frame with key unit [R-21HT-F] 3- 2 FPNLCB435WRK0 Control panel frame with key unit [R-21JV-F]...
  • Page 41 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 42 R-21HT-F R-21JV-F OVEN AND CABINET PARTS 1-10 4-28 7-13 4-10 7-13 7-13 4-25 7-12 4-32 1-13 4-26 4-34 4-26 4-24 4-15 4-27 4-14 4-19 4-15 4-36 4-16 7-10 4-40 7-11 1-12 4-23 4-18 4-24 4-21 4-20 4-21 4-21 4-22 4-20 4-13 4-33 6-10...

  • Page 43: Control Panel Parts

    R-21HT-F R-21JV-F CONTROL PANEL PARTS 3-2-3 3-2-2 DOOR PARTS 5-1-15 3-2-1 5-1-16 5-1-14 5-1-2 5-1-12 5-1-16 5-1-18 5-1-4-2 5-1-16 5-1-4-5 5-1-13 5-1-4-4 5-1-4 5-1-1 5-1-4-3 5-1-4-1 5-1-4-5 5-1-16 5-1-12 5-1-8 5-1-7 5-1-17 5-1-9 5-1-11 5-1-3 5-1-8 5-1-17 5-1-5 5-1-6 MISCELLANEOUS 5-1-10 Actual wire harness may be different from illustration.

  • Page 44: Packing And Accessories

    No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, me- chanical, photocopying, recording, or other- wise, without prior written permission of the publisher. '05 SHARP CORP. (10S0.80E) Printed in U.S.A...

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