Sharp R-55TS Service Manual
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Sharp R-55TS Service Manual

Toaster oven with microwave
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See also: Operating Manual
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 ............................................................................................................................ 11
TEST PROCEDURE ............................................................................................................................................ 13
TOUCH CONTROL PANEL ................................................................................................................................. 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 27
PICTORIAL DIAGRAM ........................................................................................................................................ 34
CONTROL UNIT CIRCUIT .................................................................................................................................. 35
PRINTED WIRING BOARD ................................................................................................................................. 36
PARTS LIST ........................................................................................................................................................ 37
PACKING AND ACCESSORIES ......................................................................................................................... 41
SHARP CORPORATION
SERVICE MANUAL
MODEL
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.
TOASTER OVEN
WITH MICROWAVE
R-55TS
R-55TS
S5310R55TYST/
Page

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  • Page 1: Table Of Contents

    R-55TS SERVICE MANUAL S5310R55TYST/ TOASTER OVEN WITH MICROWAVE R-55TS MODEL 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-55TS 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-55TS 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: Foreword And Warning

    TOASTER OVEN WITH MICROWAVE R-55TS GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP TOASTER OVEN WITH MICROWAVE, R-55TS. OPERATION 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 6: Product Specifications

    R-55TS SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 8.5 Amperes (Microwave)/ 10.8 Amperes (Grill and Bake) 60 Hertz / Single phase, 3 wire grounded Power Output 650 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Upper Heater Power Output...

  • Page 7: Oven Diagram

    R-55TS grounding adapter properly grounded and polarized. If the extension Grounded Receptacle Box cord must be used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally.

  • Page 8: Operation

    R-55TS OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during activated with the following results. The circuits to the oven operation. turntable motor, the cooling fan motor, and the high voltage components are de-energized, the oven lamp...
  • Page 9 R-55TS HEATERS mode. 3. The contacts of the select relay will close between the common and normal close terminal. HEATER UPPER MODE (GRILL1) 4. The numbers of the digital read-out start the count down In this mode, the food is cooked by the upper heater. Press to zero.
  • Page 10 R-55TS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potential above 250V. 2. CLOCK APPEARS ON DISPLAY THERMAL C/T FUSE CUT-OUT COM. N.O. SELECT RELAY N.C. N.O. COM. COM. N.O. COM. POWER TRANSFORMER PRIMARY...
  • Page 11 R-55TS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. "GRILL" TOUCHED ONCE NOTE: " " indicates components with potential above 250V. 3. COOKING TIME PROGRAMMED 4. "START" PAD TOUCHED THERMAL C/T FUSE CUT-OUT COM. N.O. SELECT RELAY N.C. N.O.
  • Page 12 R-55TS DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM CAUTION: BEFORE REPLACING A BLOWN C/T FUSE, TEST THE DOOR SENSING SWITCH, PRI- The door is opened by pushing the open button on the MARY INTERLOCK RELAY (RY2), SECOND- control panel, refer to the Figure D-1.

  • Page 13: Troubleshooting Guide

    R-55TS UPPER HEATER LOWER HEATER The upper heater is located on the top of the oven cavity The lower heater is located under the bottom of the oven assembly. The upper heater sends out heat to cook foods. cavity assembly. The lower heater sends out heat to cook foods.
  • Page 14 R-55TS CK = Check / RE = Replace TEST PROCEDURE A B C D E E F F G H I I J L M N N N N N N O P RERERERE CK CK CK POSSIBLE CASE DEFECTIVE PARTS...

  • Page 15: Test Procedure

    R-55TS 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 16 R-55TS 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 17 R-55TS 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. CAUTION: IF THE THERMAL CUT-OUT OR THERMOSTAT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT OR THERMOSTAT.
  • Page 18 R-55TS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 19 R-55TS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7. If the results of above test 5 and/or 6 are out of above specifications, the heater is probably faulty and should be replaced. 8. Reconnect all leads removed from components during testing.
  • Page 20 R-55TS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 3) Run the oven and check all functions. The following symptoms indicate a defective switch unit. a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed.
  • Page 21 R-55TS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 22 R-55TS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4) Follow the troubleshooting guide given below for repair. STEPS OCCURRENCE CAUSE OR CORRECTION Only pattern at “a” is broken. *Insert jumper wire J1 and solder. Pattern at “a” and “b” are broken.

  • Page 23: Touch Control Panel

    R-55TS TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Synchronizing Signal Circuit The touch control section consists of the following units as The power source synchronizing signal is available in shown in the touch control panel circuit. order to compose a basic standard time in the clock circuit.
  • Page 24 R-55TS DESCRIPTION OF LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description VL2-VL1 Power source voltage input terminal. Standard voltage for LCD. AN7-AN5 Terminal to change functions according to the model. DC voltage in accordance with the model in operation is applied to set up its function.
  • Page 25 R-55TS Pin No. Signal Description Lower heater driving signal. H : GND To turn on and off the lower heater relay (RY4). “L” level during GRILL2 cooking or Bake cooking. “H” level otherwise. (During Grill2 or Bake cooking) 19-20 P47-P46 Terminal not used.
  • Page 26 R-55TS Pin No. Signal Description Signal similar to P27. When any one of tact switches SW4, SW8, SW12 on switch unit matrix is touched, a corresponding signal will be input into P24. 37-40 P23-P20 Terminal not used. Tact switch strobe signal.
  • Page 27 R-55TS TOUCH CONTROL PANEL SERVICING A. On some models, the power supply cord between the touch 1. Precautions for Handling Electronic Components control panel and the oven itself is so short that the two can’t This unit uses CMOS LSI in the integral part of the circuits.
  • Page 28 R-55TS 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.

  • Page 29: Component Replacement And Adjustment Procedure

    3. If the door is not closed. exist; 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 and 1. Before wiring, other metallic plate.
  • Page 30 R-55TS 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 31 R-55TS 2. Reinstall the air duct to the magnetron with the two (2) 7. Reinstall the chassis support to the oven cavity front screws. flange and the bottom plate assembly with the two (2) 3. Reinstall the magnetron to the waveguide flange with screws.
  • Page 32 4. Where the corners have been snipped off bend corner 8. Now the turntable motor is free. areas flat. No sharp edges must be evident after removal 9. After replacement use the one (1) screw to fit the of the turntable motor cover.
  • Page 33 R-55TS 6. Remove the fan blade from the fan motor shaft according INSTALLATION to the following procedure. 1. Install the fan blade to the fan motor shaft according to 7. Hold the edge of the rotor of the fan motor by using a pair the following procedure.
  • Page 34 R-55TS misadjustment, the following adjustment should be made. should be less than 0.5mm. 4. Loosen the two (2) screws holding latch hook to the oven 2. The door sensing switch and secondary interlock switch cavity front flange. interrupt the circuit before the door can be open.
  • Page 35 R-55TS the door frame. Upper Oven 6. Reinstall the door panel to the door frame by fitting eight Hinge (8) tabs of the door frame. Upper Oven Hinge 7. Put the sealer film on the door panel. Refer to “Sealer Film”...

  • Page 36: Pictorial Diagram

    R-55TS...

  • Page 37: Control Unit Circuit

    R-55TS...

  • Page 38: Printed Wiring Board

    R-55TS SWITCH UNIT POWER UNIT WH-AA LCD1 SW14 SW13 SW15 SNACKS TOAST BAKE DCUT Sn-Ag-Cu Q’TY/TIME SW1A SW10 SW11 BAKE MICRO GRILL SW12 REHEAT POPCORN BEVERAGE REHEAT FROZEN ENTREE EXPRESS DEFROST FRESH VEGETABLES START/MINUTEPLUS TIMER/CLOCK STOP/CLEAR VRS1 Sn-Ag-Cu CN-A Figure S-3. Printed Wiring Board...

  • Page 39: Parts List

    R-55TS 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 QSW-MA085WRE0 Secondary interlock switch / Door sensing switch...
  • 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-55TS 7-20 7-20 OVEN AND CABINET PARTS 7-26 7-20 4-37 4-32 4-29 7-22 7-20 7-14 7-19 7-22 7-26 4-31 1-16 4-26 4-19 4-20 4-12 1-15 7-22 7-19 7-18 4-27 1-14 7-22 7-16 7-22 4-25 4-23 7-14 7-21 7-25 7-23 7-22...
  • Page 42 R-55TS CONTROL PANEL PARTS 3-3-2 DOOR PARTS 3-3-4 4-21 3-3-3 3-3-1 Door frame MISCELLANEOUS Sus cover Actual wire harness may be different from illustration.

  • Page 43: Packing And Accessories

    R-55TS PACKING AND ACCESSORIES 6-1 TURNTABLE SUPPORT TOP PAD ASSEMBLY (FPADBA527WRKZ) TOP PAD ASSEMBLY (FPADBA527WRKZ) 6-4 TURNTABLE WRAP COVER (SSAKHA086WREZ) WRAP COVER (SSAKHA076WRE0) CABINET COVER (SPADPA632WREZ) 6-2 OPERATION MANUAL 6-3 MENU LABEL (inside operation manual) BOTTOM PAD ASSEMBLY (FPADBA528WRKZ) PACKING CASE...
  • Page 44 No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher. 2003 SHARP CORP. (5S1.700E) Printed in U.S.A...

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