Sharp R-326FS Service Manual

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Operation manual (24 pages)

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Page 1: Table Of Contents
R- 326FS SERVICE MANUAL S1301R326FPST MICROWAVE OVEN R-326FS 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- 326FS 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 - 326FS 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
PRODUCT DESCRIPTION MICROWAVE OVEN R-326FS GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN,R-326FS. 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 - 326FS SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 11-7/8" Depth 16-3/4" Cooking Cavity Dimensions Width 14-3/4"...
Page 7: Oven Diagram
R- 326FS contact a qualified electrician and have it replaced with a properly Grounded 3-Pronged Plug Receptacle Box grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized. If the extension 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
(2) When the door is closed from the open position, the control unit. (Figure O-1). monitor switch contacts open first. Then the contacts of The display will show "SHARP SIMPLY THE BEST PRESS the secondary interlock switch and door sensing switch CLEAR AND PRESS CLOCK".
Page 9 R- 326FS tary cooking is determined by experiment with each food category and inputted into the LSI. An example of how sensor works: (POTATOES) 1. Potates at room temperature. Vapor is emitted very slowly. 2. Heat Potates. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks.
Page 10: Oven Schematic-Off Condition
R - 326FS SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potential above 250V. 2. CLOCK APPEARS ON DISPLAY OVEN THERMAL MONITOR MG. THERMAL CUT-OUT CUT-OUT FUSE 20A POWER TRANSFORMER N.O. PRIMARY INTERLOCK RELAY (RY2) CAPACITOR 0.94µF...
Page 11 R- 326FS DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM (RY2) and secondary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing The door is opened by pushing the open button on the of the monitor switch contacts. control panel, refer to the Figure D-1.
Page 12: Troubleshooting Guide
R - 326FS 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 13 R- 326FS CK = Check / RE = Replace RE RE A B C D E F F G H RE RE CK I CK CK CK J K L M N TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows when power cord is plugged into wall receptacle Monitor fuse blows when power cord...
Page 14: Test Procedure
R - 326FS 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 15 R- 326FS 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. 2.
Page 16 R - 326FS 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. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT.
Page 17 R- 326FS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit.
Page 18 R - 326FS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4) 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. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal.
Page 19 R- 326FS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. Reconnect all leads removed from components during testing. 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. MINUTE SENSOR START...
Page 20 R - 326FS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MENU 1ST STAGE 2ND STAGE 3RD STAGE STEAKS/CHOPS LEVEL TIME LEVEL TIME LEVEL TIME 0.5lb 16sec. 27sec. 41sec. (6) If improper operation is indicated, the control unit is probably defective and should be checked. 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 21 R- 326FS 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. (2) Room temperature should not exceed 95˚F (35˚C).
Page 22 R - 326FS TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation below. CHECKING CONTROL UNIT (1) Disconnect the power supply cord, and then remove outer case. (2) Open the door and block it open.
Page 23: Touch Control Panel
R- 326FS TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit The touch control section consists of the following units. This circuit generates voltages necessary in the control unit from the AC line voltage. (1) Key Unit In addition, the synchronizing signal is available in order (2) Control Unit (The Control Unit consists of Power Unit and to compose a basic standard time in the clock circuit.
Page 24: Description Of Lsi
R - 326FS DESCRIPTION OF LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description P26-P27 Terminal not used. P70-P72 Terminal not used. Connected to VC. Internal clock oscillation output. Output to control oscillation input to X2. Internal clock oscillation frequency control input setting.
Page 25 R- 326FS Pin No. Signal Description P114 Key strobe signal. Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102 and P103 terminal while one of G4 line keys on key matrix is touched. P115 Key strobe signal.
Page 26 R - 326FS Pin No. Signal Description 0.1 sec. H : GND Signal to sound buzzer (2.0 kHz). A: key touch sound. L : -5V 2.0 sec. H : GND B: Completion sound. L : -5V To input signal which communicates the door open/close information to LSI. Door close “H”...
Page 27 R- 326FS ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor which the resistance balance of the bridge circuit is The absolute humidity sensor includes two thermistors deviated to increase the voltage available at ANI5 as shown in the illustration. One thermistor is housed in terminal of the LSI.
Page 28 R - 326FS TOUCH CONTROL PANEL SERVICING A. On some models, the power supply cord between the 1. Precautions for Handling Electronic Components touch control panel and the oven itself is so short that the This unit uses CMOS LSI in the integral part of the two can’t be separated.
Page 29: Component Replacement And Adjustment Procedure
WARNING FOR WIRING To prevent an electric shock, take the following pre- and Oven cavity. cautions. 3) Sharp edge: 1. Before wiring, Bottom plate, Oven cavity, Waveguide flange, 1) Disconnect the power supply cord. Chassis support and other metallic plate.
Page 30: Power Transformer Removal
R - 326FS CAUTION: 1. DISCONNECT OVEN FROM POWER SUP NOTE: When replacing the outer case, the 2 special PLY BEFORE REMOVING OUTER CASE. Torx screws must be reinstalled in the same 2. DISCHARGE THE HIGH VOLTAGE CAPACI- locations. TOR BEFORE TOUCHING ANY OVEN COM- PONENTS OR WIRING.
Page 31: Control Panel Assembly Removal
R- 326FS 5. Reinstall outer case and check that the oven is operating CAUTION: WHEN REPLACING MAGNETRON, BE SURE properly. THE R.F. GASKET IS IN PLACE AND MOUNT- ING SCREWS ARE TIGHTENED SECURELY. ® POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL Terminal 1.
Page 32: Pictorial Diagram
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 33 R- 326FS DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL 1. Disconnect the power supply cord and remove outer case. Reinstallation 2. Open the door and block it open. 1. Reinstall each switch in its place. The secondary interlock/ 3.
Page 34 R - 326FS 9. Release door panel from eight (8) tabs of door frame. 10.Now, door panel with sealer film is free. 11.Tear sealer film from door panel. Upper Oven 12.Now, door panel is free. Upper Hinge Oven Hinge 13.Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head.
Page 35 R- 326FS...
Page 36: Control Unit Circuit
R - 326FS...
Page 37: Printed Wiring Board
R- 326FS Figure S-4. Printed Wiring Board of Power Unit...
Page 38: Parts List
R - 326FS 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-MA147WRZZ Secondary interlock switch/door sensing switch 1- 1 QSW-MA137WRE0...
Page 39 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 40 R - 326FS OVEN AND CABINET PARTS 4-24 4-22 1-14 4-19 7-10 4-23 4-20 4-17 4-13 4-21 4-11 4-19 4-12 4-11 4-15 1-13 4-14 4-10 1-12 4-18 1-10 4-16 1-11...
Page 41 R- 326FS CONTROL PANEL PARTS Before attaching Control unit to Control panel, foil side of Control unit must be cleaned by ethyl-alcohol. 3-1-5 3-1-3 3-1-4 3-1-6 3-1-1 3-1-2 DOOR PARTS 3-2-1 3-2-2 5-3-1 5-3-2 5-3-3 MISCELLANEOUS Actual wire harness may be different from illustration.
Page 42: Packing And Accessories
R - 326FS PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA492WRKZ DOOR PROTECTION SHEET SPADPA204WRE0 PLASTIC BAG SSAKHA034WRE0 6- 4 INSTRUCTION BOOK & PRINTING MATTER BOTTOM PAD ASSEMBLY 6- 2 TURNTABLE TRAY FPADBA493WRKZ 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA527WREZ OVEN CAVITY Not replaceable items.
Page 43 R- 326FS...
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. 2003 SHARP CORP. (2S2.530E) Printed in U.S.A...

Sharp R-326FS Service Manual

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