Sharp R-370EK Service Manual
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Sharp R-370EK Service Manual

Sharp R-370EK Service Manual

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Popcorn
Baked
Fresh
Potatoes
Rice
Frozen
Rolls &
Vegetable s
Compu
Entree
Muffins
Defrost
Reheat
1
2
Ground
3
Frozen
Chicken
Sensor
Meat
Fish
Vegetable s
Breast
Veverage
Kitchen Timer
Seafood
Clock
6
7
8
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 ............................................................................................................................ 10
TEST PROCEDURE ............................................................................................................................................ 12
TOUCH CONTROL PANEL ................................................................................................................................. 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 26
PICTORIAL DIAGRAM ........................................................................................................................................ 33
POWER UNIT CIRCUIT ...................................................................................................................................... 34
CPU UNIT CIRCUIT ............................................................................................................................................ 35
PRINTED WIRING BOARD ................................................................................................................................. 36
PARTS LIST ........................................................................................................................................................ 37
PACKING AND ACCESSORIES ......................................................................................................................... 39
SHARP CORPORATION
SERVICE MANUAL
4
5
Power
Custom
Level
Help
9
0
STOP
Minute Plus
Clear
START
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

MICROWAVE OVEN
R-370EK
MODELS
R-370ES
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R - 370EK
R - 3 70 E S
S4112R370EPS/
Page

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  • Page 1: Table Of Contents

    R - 370EK R - 3 70 E S SERVICE MANUAL S4112R370EPS/ MICROWAVE OVEN R-370EK MODELS Popcorn Baked Fresh Potatoes Rice Frozen Rolls & Vegetable s Compu Entree Muffins Defrost Reheat Ground Frozen Chicken Sensor Meat Fish Power Vegetable s...

  • 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-370EK R-370ES 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- 370EK R- 37 0ES 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 MICROWAVE OVEN R-370EK/ R-370ES 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-370EK, R-370ES. 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- 370EK R- 37 0ES SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.5 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 17-1/4" Height 13-3/8" Depth 18-3/8" Cooking Cavity Dimensions Width 13-3/4"...

  • Page 7: Oven Diagram

    R-370EK R-370ES contact a qualified electrician and have it replaced with a properly Grounded 3-Pronged Plug grounded three-pronged wall receptacle or have a grounding adapter Receptacle Box 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

    (Figure O-1). close. And contacts of the relay (RY1) open. 1. The display will show "SHARP SIMPLY THE BEST If the primary interlock switch and secondary interlock relay PRESS CLEAR AND PRESS CLOCK".To set any...
  • Page 9 R-370EK R-370ES is cooked, water vapor is developed. The sensor “senses” 3. Sensor detects moisture and humidity and calculates the vapor and its resistance increases gradually. When the cooking time and variable power. resistance reaches the value set according to the menu, Cooking Sequence.

  • Page 10: Oven Schematic-Off Condition

    R- 370EK R- 37 0ES SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY NOTE: " " indicates components with potential above 250V. AH SENSOR OVEN THERMAL MONITOR MG. THERMAL CUT-OUT CUT-OUT FUSE 20A POWER TRANSFORMER N.O.
  • Page 11 R-370EK R-370ES DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM RELAY (RY1), PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH FOR The door is opened by pulling the door. Refer to the Figure PROPER OPERATION. (REFER TO CHAP- D-1. TER "TEST PROCEDURE").

  • Page 12: Troubleshooting Guide

    R- 370EK R- 37 0ES 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: Test Procedure

    R-370EK R-370ES 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.
  • Page 14 R- 370EK R- 37 0ES 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 the 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-370EK R-370ES 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 16 R- 370EK R- 37 0ES 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-370EK R-370ES 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- 370EK R- 37 0ES TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If the Key unit is defective, replace the key unit. 2. Control Unit The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure J) to determine if control unit is faulty. 2-1 In connection with pads.
  • Page 19 R-370EK R-370ES 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. To discharge the high voltage capacitor, wait for 60 seconds.
  • Page 20 R- 370EK R- 37 0ES TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER STEPS OCCURRENCE CAUSE OR CORRECTION Only pattern at "a" is broken. *Insert jumper wire J1 and solder. Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d". 5) Make a visual inspection of the varistor.
  • Page 21 R-370EK R-370ES TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture with a dry cloth or paper towel. (6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be at refrigerator temperature and canned soup at room temperature.
  • Page 22 R- 370EK R- 37 0ES TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (8) After that procedure, re-connect the power supply cord. (9) Check the sensor cook operation proceed as follows: 9-1. Touch the KITCHEN TIMER/CLOCK pad once, the POWER LEVEL pad twice, the START pad once, the number pad 1 once and the number pad 4 once.

  • Page 23: Touch Control Panel

    R-370EK R-370ES TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL In addition, the synchronizing signal is available in order The control unit section consists of the following units. to compose a basic standard time in the clock circuit. (1) Key Unit...
  • Page 24 R- 370EK R- 37 0ES Pin No. Signal Description AH sensor input. This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI. Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI.
  • Page 25 R-370EK R-370ES Pin No. Signal Description XOUT Internal clock oscillation frequency control output. Output to control oscillation input of XIN. Power source voltage: -5.0V. VC voltage of power source circuit input. Terminal not used. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of G7 line keys on key matrix is touched.
  • Page 26 R- 370EK R- 37 0ES ABSOLUTE HUMIDITY SENSOR CIRCUIT 1) Structure of Absolute Humidity Sensor increase the voltage available at AN1 terminal of the LSI. The absolute humidity sensor includes two thermistors Then the LSI observes that voltage at AN1 terminal and as shown in the illustration.
  • Page 27 R-370EK R-370ES TOUCH CONTROL PANEL SERVICING transformer. 1. Precautions for Handling Electronic Components 4) Re-install the outer case (cabinet). This unit uses CMOS LSI in the integral part of the 5) Re-connect the power supply cord after the outer circuits. When handling these parts, the following case is installed.

  • Page 28: 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, Base plate, Oven cavity, Waveguide flange, Angles, 1) Disconnect the power supply cord. Guides and other metallic plates.

  • Page 29: Pictorial Diagram

    R-370EK R-370ES 6. Lift entire outer case from the unit. COMPONENTS OR WIRING. 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.
  • Page 30 R- 370EK R- 37 0ES transformer from the high voltage capacitor. 9. Remove the capacitor holder. The capacitor is now free. 6. Remove one (1) screw holding capacitor holder to base CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI- plate. FIER AND HIGH VOLTAGE CAPACITOR, 7.

  • Page 31: Power Unit Circuit

    R-370EK R-370ES fan blade. 7. Hold the fan duct assembly to the base plate with the two 5. Install the fan blade to the shaft of fan motor by pushing (2) screws. the fan blade with a small, light weight, ball peen hammer 8.
  • Page 32 R- 370EK R- 37 0ES 8. Now the turntable motor is free. CAUTION: NO SHARP EDGES MUST BE EVIDENT AF- 9. After replacement use the one (1) screw to fit the TER REMOVAL OF THE TURNTABLE MO- turntable motor cover.
  • Page 33 R-370EK R-370ES Note: The door on a microwave oven is designed to act as Putty Knife an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle. Choke Cover This function does not require that door be air-tight, moisture (condensation)-tight or light-tight.

  • Page 34: Cpu Unit Circuit

    R- 370EK R- 37 0ES INDIVIDUAL DOOR PARTS REMOVAL Door frame Hole of PWB Cover CPU unit DOOR PANEL PWB cover 1. Disconnect the power supply cord. 2. Remove the door from the oven. Refer to "DOOR REPLACEMENT". 3. To discharge the high voltage capacitor, wait for 60 9-pin wire seconds.
  • Page 35 R-370EK R-370ES RECTIFIER H.V.
  • Page 36 R- 370EK R- 37 0ES D1-D4 1N4002 CN-C – – 2SB1238 R2 330 1w – AC(N) 10 /35v OVEN LAMP TURNTABLE OVEN LAMP MOTOR TURNTABLE FAN MOTOR MOTOR FAN MOTOR DTD143ES AC(H) BUZZER PKM22EPT MICRO MICRO DTA143ES DOOR D20 1SS270A DOOR SENSING SENSING...
  • Page 37 R-370EK R-370ES SEG24 SEG24 SEG23 SEG23 SEG22 SEG22 SEG21 SEG21 SEG20 SEG20 SEG19 SEG19 SEG18 SEG18 SEG17 SEG17 SEG16 SEG16 SEG15 SEG15 SEG14 SEG14 SEG13 SEG13 SEG12 SEG12 SEG11 SEG11 SEG10 SEG10 SEG9 SEG9 SEG8 SEG8 SEG7 SEG7 SEG6 SEG6...

  • Page 38: Printed Wiring Board

    R- 370EK R- 37 0ES CN - C CN - B CN - A (J1) Figure S-4. Printed Wiring Board of Power Unit...

  • Page 39: Parts List

    2- 2 GLEGPA087WRFZ Front leg 2- 3 GLEGPA081WRFZ 2- 4 GCABUA803WRPZ Outer case cabinet [R-370ES] 2- 4 GCABUA812WRPZ Outer case cabinet [R-370EK] 2- 5 GCOVAA291WRFZ Harness cover POWER UNIT PARTS 3- 1 DPWBFC179WRUZ Power unit 3- 1A QCNCMA431DRE0 2-pin connector (CN-B)

  • Page 40: Door Parts

    Screw : 4mm x 12mm 7-13 XOTSD40P12RV0 Screw : 4mm x 12mm 7-14 XOTSE40P08000 Screw : 4mm x 8mm [R-370ES] 7-14 XOTSF40P08000 Screw : 4mm x 8mm [R-370EK] 7-15 LX-EZA060WREZ Special screw 7-16 XOTSD40P12000 Screw : 4mm x 12mm 7-17 XHBWW30P08000...

  • Page 41: 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. TOP PAD ASSEMBLY FPADBA451WRKZ DOOR PROTECTION SHEET...
  • Page 42 R- 370EK R - 3 7 0 E S OVEN AND CABINET PARTS 7-13 4-17 7-17 4-28 7-14 1-14 4-18 4-28 4-26 1-13 4-25 4-24 7-14 4-27 7-12 4-19 7-13 7-11 4-21 4-23 7-11 7-15 4-22 4-31 4-16 7-11 4-30 4-11 4-15 1-12...
  • Page 43 R - 370EK R - 3 70 E S DOOR PARTS 5-10 5-13 5-11 5-13 5-12 5-12 5-14 5-12 5-3-1 5-12 5-3-2 MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.
  • 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. 2001 SHARP CORP. (4S2.530E) Printed in U.S.A...

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