Sharp R-820BK Service Manual
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Sharp R-820BK Service Manual

Sharp double grill convection microwave oven
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See also: Owner's Manual , Operation Manual With Cookbook
GRI LL
2
CO NV EC TIO N
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDE FRONT COVER
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 ............................................................................................................................ 13
Test Procedure ............................................................................................................................................ 15
Touch Control Panel ................................................................................................................................. 24
Component Replacement And Adjustment Procedure ................................................................ 30
Pictorial Diagram ........................................................................................................................................ 37
Power Unit Circuit ...................................................................................................................................... 38
Cpu Unit Circuit ............................................................................................................................................ 39
PRINTED WIRING BOARD ................................................................................................................................. 40
Parts List ........................................................................................................................................................ 41
Packing And Accessories ......................................................................................................................... 43
SHARP CORPORATION
SERVICE MANUAL
MODELS
COOK
HELP
CUSTO M
HELP
PIZZA
GRILL
BAKE
COMP U
ROAST
COOK DEFRO ST
CONV EC
GRILL
ROAS T
POPC ORN
REHE AT
MINU TE
PLUS
1 2 3 4 5
100˚ F
150˚ F
275˚ F
300˚ F
325˚ F
6 7 8 9 O
350˚ F
375˚ F
400˚ F
425˚ F
450˚ F
KITCH EN
TIME R
CLOC K
POWE R
LEVE L
STOP
STAR T
CLEA R
TOUC H ON
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

DOUBLE GRILL
CONVECTION
MICROWAVE OVEN
R-820BK
R-820BW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-820BK
R-820BW
S5812R820BPW/
Page

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  • Page 1 R-820BK R-820BW SERVICE MANUAL S5812R820BPW/ DOUBLE GRILL CONVECTION MICROWAVE OVEN R-820BK MODELS COOK HELP CUSTO M HELP R-820BW PIZZA GRILL BAKE COMP U ROAST COOK DEFRO ST CONV EC GRILL ROAS T POPC ORN REHE AT MINU TE PLUS 1 2 3 4 5 100˚...

  • Page 2: 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-820BK R-820BW 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-820BK R-820BW 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 GENERAL INFORMATION R-820BK / R-820BW FOREWORD OPERATION This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-820BK, R-820BW. It is recommended that service personnel carefully study the entire...

  • Page 6: General Information

    R-820BK R-820BW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 12.5 Amperes (Microwave) / 13.0 Amperes (Grill/ Convection) 60 Hertz / Single phase, 3 wire grounded Power Output 900 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz Top Heater Power Output 1000 Watts Top &...

  • Page 7: Oven Diagram

    R-820BK R-820BW 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-820BK R-820BW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during the secondary interlock switch and primary interlock oven operation. relay and is mechanically associated with the door so that it will function in the following sequence.
  • Page 9 R-820BK R-820BW TOP AND BOTTOM HEATER MODE work with 100% power. The relay(RY1) and the In this mode, the food is cooked by both the top heaters and convection motor are not energized at this preheating bottom heater. Press the GRILL pad and number "1" pad condition.
  • Page 10 R-820BK R-820BW ROAST COOKING CONDITION FIRE SENSING FEATURE (MICROWAVE MODE) Touch the ROAST pad once. And then program desired This model incorporates a sensing feature which will stop cooking time by touching the number pads. The ROAST the oven's operation if there is a fire in the oven cavity during pad is preprogrammed for 325˚F with 30% microwave...
  • Page 11 R-820BK R-820BW SCHEMATIC NOTE: Indicates components with potential above 250 V. NOTE: CONDITION OF OVEN 1. DOOR CLOSED. OR CLOCK APPEAR ON DISPLAY. THERMAL CUT-OUT (OVEN) CONTROL UNIT THERMAL CUT-OUT (MAG.) SECONDARY INTERLOCK SWITCH Figure O-1 Oven Schematic-OFF Condition SCHEMATIC NOTE: CONDITION OF OVEN 1.
  • Page 12 R-820BK R-820BW SCHEMATIC NOTE: Indicates components with potential above 250 V. NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. GRILL PAD TOUCHED. 3. NUMBER "1" PAD TOUCHED. 4. COOKING TIME PROGRAMMED. 5. START PAD TOUCHED. THERMAL CUT-OUT (OVEN) CONTROL UNIT...
  • Page 13 R-820BK R-820BW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CONVECTION PAD TOUCHED. 3. NUMBER "1" PAD TOUCHED. 4. TEMPERATURE PAD TOUCHED. 5. COOKING TIME PROGRAMMED. 6. START PAD TOUCHED. THERMAL CUT-OUT (OVEN) CONTROL UNIT THERMAL CUT-OUT (MAG.) SECONDARY...
  • Page 14 R-820BK R-820BW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM of the monitor switch contacts. CAUTION: BEFORE REPLACING A BLOWN MONITOR The door is opened by pushing the open button on the FUSE TEST THE DOOR SENSING SWITCH, control panel, refer to Figure D-1.

  • Page 15: Troubleshooting Guide

    R-820BK R-820BW BOTTOM HEATER Most of this hot air is reheated by the top heaters and the The bottom heater is located on the floor of the oven cavity bottom heater and passes through the convection passage assembly. The bottom heater sends out heat to grill foods.
  • Page 16 (Display operates.) Home fuse blows when power cord CONDITION is plugged into wall outlet. "SHARP SIMPLY ..PRESS CLOCK" does not appear in display when power cord is plugged into wall outlet. Display does not operate properly when STOP/CLEAR pad is pressed.

  • Page 17: Test Procedure

    R-820BK R-820BW 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 18 R-820BK R-820BW 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.
  • Page 19 R-820BK R-820BW 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. Run the oven and check all functions.
  • Page 20 R-820BK R-820BW 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 21 R-820BK R-820BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 10.Reconnect the power supply cord after the outer case is installed. 11.Run the oven and check all functions. THERMISTOR TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open.
  • Page 22 R-820BK R-820BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6) Re-install the outer case (cabinet). 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.
  • Page 23 R-820BK R-820BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
  • Page 24 R-820BK R-820BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER COMPU DEFROST TEST WARNING : The oven should be fully assembled before following procedure. (1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) Close the door, touch the " Compu Defrost " pad once and touch the Number pad "1", and touch the Number pad 5.
  • Page 25 R-820BK R-820BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER STEPS OCCURRENCE CAUSE OR CORRECTION The rated AC voltage is not present between Pin No. 1 of the 3-pin connector (A) and the Check supply voltage and oven power cord. common terminal of the relay RY6.

  • Page 26: Touch Control Panel

    R-820BK R-820BW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as 4) ACL shown in the touch control panel circuit. A circuit to generate a signal which resets the LSI to the initial state when power is supplied.
  • Page 27 R-820BK R-820BW DESCRIPTION OF LSI LSI(IZA888DR) The I/O signal of the LSI(IZA888DR) are detailed in the following table. Pin No. Signal Description Terminal not used. Power source voltage input terminal. Standard voltage for LCD. AN7-AN5 Heating constant compensation terminal. Terminal not used.
  • Page 28 R-820BK R-820BW Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G7 line key on matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G6 line key on matrix is touched.
  • Page 29 R-820BK R-820BW Pin No. Signal Description XOUT Internal clock oscillation frequency control output. Output to control oscillation input of XOUT. Power source voltage: -5V. VC voltage of power source circuit input. Power output ON time OFF time Bottom heater driving signal.
  • Page 30 R-820BK R-820BW Pin No. Signal Description SEG9 Segment data signal. Connected to LCD. No connection in LCD. 82-90 Segment data signal. SEG8-SEG0 Connected to LCD. Signal is similar to SEG39. Connected to GND. VREF Connected to GND. AVSS Connected to VC.
  • Page 31 R-820BK R-820BW SERVICING 1. Precautions for Handling Electronic Components 5) Re-connect the power supply cord after the outer case is This unit uses CMOS LSI in the integral part of the circuits. installed. When handling these parts, the following precautions should 6) Run the oven and check all functions.

  • Page 32: 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 33 R-820BK R-820BW 8. Lift the entire case from the oven. Outer Case Cabinet Sub Back Plate 9. Discharge the H.V. capacitor before carrying out any further work. 10.Do not operate the oven with the outer case removed. Back Plate CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE.

  • Page 34: Turntable Motor Removal

    3. Where the corners have been snipped off, bend corner the turntable motor assembly to fit turntable motor cover. areas flat. No sharp edge must be evident after removal NOTE: The one (1) screw to fit the turntable motor cover of turntable motor cover.
  • Page 35 R-820BK R-820BW COOLING FAN MOTOR REMOVAL REMOVAL CAUTION: 1. Disconnect the power supply cord and then remove outer * Do not reuse the removed fan blade because the case. hole (for shaft) may be larger than normal. 2. Open the door and block it open.

  • Page 36: Pictorial Diagram

    R-820BK R-820BW THERMISTOR REMOVAL 1. Disconnect the power supply cord and then remove 7. Remove the air duct with the air guide cover and the outer case. partition plate from the oven cavity rear plate. 2. Open the door and block it open.
  • Page 37 R-820BK R-820BW 4. Remove the control panel assembly referring to Latch Hook "CONTROL PANEL ASSEMBLY REMOVAL". Door 5. Disconnect the leads from all switches. Sensing Switch 6. Remove the two (2) screws holding the latch hook to the oven cavity.
  • Page 38 R-820BK R-820BW 7. Release two (2) pins of door panel from two (2) holes of face plate is to be less than 1.0mm. upper and lower oven hinges by lifting up. 3. Door is positioned with its face pressed toward cavity 8.
  • Page 40 R-820BK R-820BW Q2 2SB1238 R4 27 D1-4 R5 4.7k 11ES1 AC120V 60Hz R3 510 1/2w R2 510 1/2w BUZZER R6 3.3k FAN MOTOR FAN MOTOR CONVECTION CONVECTION MOTOR MOTOR N.O. OVEN LAMP TURNTABLE DTD143ES MOTOR OVEN LAMP TURNTABLE MOTOR 10µ/35v BOTTOM N.O.
  • Page 41 R-820BK R-820BW...

  • Page 42: Printed Wiring Board

    R-820BK R-820BW CN - C VRS1 CN - A LOT NO. Figure S-4. Printed Wiring Board of Power Unit...

  • Page 43: Parts List

    Transformer VRS1 RH-VZA032DRE0 Varistor (10G471K) 3- 2 DPWBFB794WRK0 CPU unit 3- 3 DPNLCB494WRK0 Control panel frame with key unit [R-820BK] 3- 3 DPNLCB496WRK0 Control panel frame with key unit [R-820BW] 3- 3-1 JBTN-B086WRF0 Open button [R-820BW] 3- 3-1 JBTN-B092WRF0 Open button [R-820BK]...
  • Page 44 Latch head 5- 4 LSTPPA177WRF0 Glass stopper 5- 5 MSPRTA187WRE0 Latch spring 5- 6 PGLSPA513WRE0 Front door glass [R-820BK] 5- 6 PGLSPA514WRE0 Front door glass [R-820BW] 5- 7 XCPSD40P06000 Screw : 4mm x 6mm 5- 8 XCPSD40P08000 Screw : 4mm x 8mm...

  • 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-820BK R-820BW OVEN AND CABINET PARTS 7-19 6-11 7-11 7-19 4-33 7-10 4-25 7-11 7-12 4-29 7-10 4-36 4-23 1-11 4-26 4-41 1-12 7-10 7-17 7-10 7-15 1-10 4-15 4-27 7-13 7-10 7-10 1-16 4-39 4-31 4-42 4-30 4-19 4-38...
  • Page 47 R-820BK R-820BW CONTROL PANEL PARTS 3-3-3 DOOR PARTS 3-3-1 3-3-2 MISCELLANEOUS Actual wire harness may be different from illustration. 6-10...
  • 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. '98 SHARP CORP. (5S2.530E) Printed in U.S.A...

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