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Sharp R-1490 Service Manual
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Sharp R-1490 Service Manual

Sharp R-1490 Service Manual

Over the range microwave oven
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This is a supplemental Service Manual for Models R-1490, R-1491 and R-1492. These models are quite similar to
base model R-1480,R-1481 and R-1482. Use this supplemental manual together with the Base Models Service
Manual (Refer No. is S3807R1480X//) for complete operation, service information, etc..
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 .............................................................................................................................. 8
TEST PROCEDURE .............................................................................................................................................. 9
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................ 11
CONPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 13
PICTORIAL DIAGRAM ........................................................................................................................................ 15
CONTROL PANEL CIRCUIT ............................................................................................................................... 16
PARTS LIST ........................................................................................................................................................ 17
PACKING AND ACCESSORIES ......................................................................................................................... 22
SERVICE MANUAL
MODELS
S e n s o r C o o
k i n g
Custom
Help
Popucorn
Baked
potatoes
Reheat
Frozen
Frozen
vegetable st
Frozen
entrees
vegetable s
Ground
meat
Rice
Fresh/
seafood
Compu
Compu
Cook
Defrost
1
2
3
4
5
6
7
8
9
0
Power
Kitchen Timer
Level
Minute
Clock
Plus
Turntable
Stop
On/Off
Start
Clear
In the interest of user-safety the oven should be restored to its original
Touch On
Work
Night
Light
Fan
Light
Hi/Lo
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

OVER THE RANGE
MICROWAVE OVEN
R-1490
R-1491
R-1492
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-1490
R-1491
R-1492
S4808R1490X//
Page

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Summary of Contents for Sharp R-1490

  • Page 1: Table Of Contents

    Voltage Power Transformer, Magnetron, High Voltage Recti- fier Assembly, High Voltage Harness etc..) This is a supplemental Service Manual for Models R-1490, R-1491 and R-1492. These models are quite similar to base model R-1480,R-1481 and R-1482. Use this supplemental manual together with the Base Models Service Manual (Refer No.

  • 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-1490 R-1491 R-1492 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-1490 R-1491 R-1492 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

    SHARP OVER THE RANGE MICROWAVE OVEN, R-1490/ R-1491/ R1492. The models R-1490, R-1491 and R-1492 is quite similar to base models R-1480/81/82 (Refer No. is S3807R1480X//). It is recommended that service personnel carefully study the entire text of this manual and base model service manual so that they will be qualified to render satisfactory customer service.

  • Page 6: Product Specifications

    R-1490 R-1491 R-1492 PRODUCT SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14.3 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 950 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Convection Power Output 1700 watts Case Dimensions Width 29-15/16"...

  • Page 7: Compu Cook

    R-1490 R-1491 R-1492 Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more branch circuit, using a grounded receptacle.

  • Page 8: Operation

    R-1490 R-1491 R-1492 OPERATION DESCRIPTION OF OPERATING SEQUENCE NOTE: During this first stage, do not open the door or touch SENSOR COOKING CONDITION STOP/CLEAR pad. Using the INSTANT SENSOR function, the foods are cooked 4. When the sensor detects the vapor emitted from the or defrosted without figuring time, power level or quantity.
  • Page 9 R-1490 R-1491 R-1492 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED CLOCK APPEARS ON DISPLAY CAVITY MAGNETRON THERMAL CUT-OUT TEMPERATURE FUSE CONTROL UNIT COM. N.O. AH SENSOR FUSE POWER TRANSFORMER HOOD FAN THERMAL High CUT OUT N.C. DOOR SENSING SWITCH HOOD 120 V AC.

  • Page 10: Troubleshooting Guide

    R-1490 R-1491 R-1492 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 11: Test Procedure

    R-1490 R-1491 R-1492 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER KEY UNIT 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. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is making good contact, verify that the door sensing switch (stop switch) operates properly;...
  • Page 12 R-1490 R-1491 R-1492 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. (2) Place the container on the center of tray in the oven cavity. (3) Close the door.

  • Page 13: Touch Control Panel Assembly

    R-1490 R-1491 R-1492 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (11) Open the door and block it open. (12) Discharge high voltage capacitor. (13) Disconnect the dummy resistor circuit from the sensor connector of control panel. (14) Carry out necessary repair.
  • Page 14 R-1490 R-1491 R-1492 ABSOLUTE HUMIDITY SENSOR CIRCUIT the food is heated to generate moisture by which the (1) Structure of Absolute Humidity Sensor resistance balance of the bridge circuit is deviated to The absolute humidity sensor includes two thermistors increase the voltage available at AN6 terminal of the LSI.

  • Page 15: Conponent Replacement And Adjustment Procedure

    3. The door gasket or seal is damaged. 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 16 R-1490 R-1491 R-1492 15.Screw the oven lamp off from the lamp socket. 16.Remove the lamp socket from the lamp angle. Oven lamp 17.Pull the wire leads from the oven lamp socket by pushing socket the terminal hole of the oven lamp socket with a small flat type screw driver.
  • Page 17 R-1490 R-1491 R-1492...

  • Page 18: Control Panel Circuit

    R-1490 R-1491 R-1492 3.3k 3.3k 3.3k D752 3.3k 3.3k 3.3k 3.3k 100k 3.3k 100k 100k R100 3.3k 3.3k 3.3k 3.3k IZA877DR (J15) 4.7k (J7) 4.7k (J5) HZ4A2 (J3) (J6) /35v (J4) /50v (J2) HZ5C2 3.3k /35v /50v /50v HZ16-1 SP40 1/4w 1.5k...

  • Page 19: Parts List

    Outer case cabinet [R-1491] 2- 5 GCABUB086MRP0 Outer case cabinet [R-1492] 2- 6 TMAPCB052MRR0 Schematic diagram 2- 7 FANGKB009MRY0 Hood lamp glass assembly [R-1490] 2- 7 FANGKB010MRY0 Hood lamp glass assembly [R-1491] 2- 7 FANGKB011MRY0 Hood lamp glass assembly [R-1492] 2-7-1 LANGQB016MRP0...
  • Page 20 Zener diode (HZ6A-3) VHEHZ161///-1 Zener diode (HZ16-1) VHEHZ5C2///-1 Zener diode (HZ5C-2) VHEHZ4A2///-1 Zener diode (HZ4A-2) 3- 2 FPNLCB213MRK0 Control panel sub. assembly [R-1490] 3- 2 FPNLCB214MRK0 Control panel sub, assembly [R-1491] 3- 2 FPNLCB215MRK0 Control panel sub, assembly [R-1492] 3- 2-1 FUNTKB161MRE0...
  • Page 21 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 22 R-1490 R-1491 R-1492 OVEN AND CABINET PARTS 7-10 6-16 1-14 4-13 1-18 4-19 4-10 4-12 4-11 4-24 1-12 1-15 1-16 4-23 1-13 1-17 4-18 6-10 6-16 4-18 6-12 4-16 4-20 1-10 4-22 1-11 4-14 4-17 1-10 6-14 4-15 6-13 4-15...
  • Page 23 R-1490 R-1491 R-1492 CONTROL PANEL PARTS 3 - 3 3 - 2 3-1E 3-2-2 3 - 1 3-2-1 3 - 3 DOOR PARTS 7 - 3 3 - 3 4-21 5-2-1 5-2-3 5-2-2 MISCELLANEOUS 5-2-4 6-1-1 6-1-4 6-1-5 6-1-2 6-1-6...

  • Page 24: Packing And Accessories

    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. (4S2.530E) Printed in U.S.A...

This manual is also suitable for:

R-1492R-1491

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