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

Toaster oven with microwave
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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 ............................................................................................................................ 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
TOASTER OVEN WITH MICROWAVE
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.
R-55TS-F
R-55TS-F
SY517R55TSPF/
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  • Page 1: Table Of Contents

    R-55TS-F SERVICE MANUAL SY517R55TSPF/ TOASTER OVEN WITH MICROWAVE R-55TS-F 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-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-55TS-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...
  • Page 5 TOASTER OVEN WITH MICROWAVE R-55TS-F 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-F. 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: General Information

    R-55TS-F 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 R-55TS-F 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-F OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during voltage components are de-energized, the oven lamp oven operation. remains on, and the digital read-out displays the time still remaining in the cook cycle when the door was opened.
  • Page 9 R-55TS-F HEATER 5-2. The oven will continue to function for 30 minutes, UPPER MODE (GRILL1) turning the upper heater and the lower heater on In this mode, the food is cooked by the upper heater. Press and off, as needed to maintain the selected preheat the GRILL pad once and then enter the cooking time by temperature.
  • Page 10 R-55TS-F SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potential above 250V. 2. CLOCK APPEARS ON DISPLAY NOISE FILTER TEMPERATURE THERMAL FUSE (MAGNETRON) CUT-OUT FUSE N.O. COM. COM. N.O. COM. POWER TRANSFORMER PRIMARY CONTROL...
  • Page 11 R-55TS-F 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 NOISE FILTER TEMPERATURE THERMAL FUSE (MAGNETRON) CUT-OUT FUSE N.O. COM.
  • Page 12 R-55TS-F DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM 3. If the door is opened, and the primary interlock relay (RY2) and the secondary interlock switch contact fail to The door is opened by pushing the open button on the open, the monitor fuse blows simultaneously with closing control panel, refer to the Figure D-1.

  • Page 13: Troubleshooting Guide

    R-55TS-F LOWER HEATER NOISE FILTER The lower heater is located under the bottom of the oven The noise filter prevents the radio frequency interference cavity assembly. The lower heater sends out heat to cook that might flow back in the power unit.

  • Page 14: Test Procedure

    R-55TS-F CK = Check / RE = Replace TEST PROCEDURE A B C D E E E F F G H I M N O O O O O P Q RERERERE CK CK CK POSSIBLE CASE DEFECTIVE PARTS PROBLEM...
  • Page 15 R-55TS-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 16 R-55TS-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 17 R-55TS-F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 3. Discharge high voltage capacitor. 4. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the magnetron reaches approximately 302˚F(150˚C). An open temperature fuse indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the cooling fan and air guide.
  • Page 18 R-55TS-F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is...
  • Page 19 R-55TS-F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 9. Reinstall the outer case (cabinet). 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.
  • Page 20 R-55TS-F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Before testing, 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 21 R-55TS-F 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. 13P HARNESS WH-B 4.7K START/ STOP/ EXPRESS FRESH MINUTEPLUS CLEAR DEFROST VEGETABLES 4.7K...
  • Page 22 R-55TS-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.

  • Page 23: Touch Control Panel

    R-55TS-F 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-F 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-F 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-F Pin No. Signal Description Tact switch strobe signal. Signal applied to tact switch section. A pulse signal is input to P24 - P27 terminal while one of tact swithes (SW9, SW10. SW11, SW12) on matrix is touched. Tact switch strobe signal.
  • Page 27 R-55TS-F 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-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.

  • 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: Pictorial Diagram

    R-55TS-F 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-F 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-F 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-F 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-F 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 R-55TS-F...
  • Page 37 R-55TS-F...
  • Page 38 R-55TS-F 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 VRS1 STOP/CLEAR CN-A Figure S-3. Printed Wiring Board...

  • Page 39: Control Unit Circuit

    R-55TS-F PARTS LIST ∆ Note: The parts marked “ ” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. The price codes marked "@" have been changed due to changing production to SATL.
  • 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-F OVEN AND CABINET PARTS 7-19 7-19 4-14 7-11 7-19 4-37 4-32 4-29 7-19 7-14 4-31 7-11 7-19 1-16 4-26 1-17 4-12 1-15 4-39 7-18 1-14 4-27 7-16 4-25 7-14 4-23 7-15 7-21 4-18 4-34 1-11 4-30 7-14 4-15 4-17...
  • Page 42 R-55TS-F CONTROL PANEL PARTS DOOR PARTS 4-21 MISCELLANEOUS Actual wire harness may be different from illustration.

  • Page 43: Packing And Accessories

    R-55TS-F PACKING AND ACCESSORIES TRAY PROTECT (SPADPA642WREZ) 6-4 TURNTABLE 6-1 TURNTABLE SUPPORT TRAY PAD ASSEMBLY (SPADFA598WREZ) WRAP COVER (SSAKHA014WREZ) WRAP COVER (SSAKHA087WREZ) CABINET COVER (SPADPA632WREZ) 6-2 OPERATION MANUAL 6-3 MENU LABEL (inside operation manual) PAD ASSEMBLY (CPADBA327WRKZ) Not replaceable items.
  • 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. 2005 SHARP CORP. (12S1.695E) Printed in U.S.A...

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