Service manual

ManualsBrandsSharp ManualsMicrowave OvenR-1491

R-1490

R-1491

R-1492

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

Page

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO

AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER

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

S4808R1490X//

R-1490

R-1491

R-1492

MODELS

SERVICE MANUAL

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

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..

OVER THE RANGE

MICROWAVE OVEN

12345

67890

Power

Level

Kitchen Timer

Clock

Minute

Plus

Turntable

On/Off

Stop

Clear

Start

Touch On

Work

Light

Night

Light

Fan

Hi/Lo

Compu

Cook

Compu

Defrost



Rice

Popucorn Reheat

Fresh/

seafood

Ground

meat

Frozen

vegetablest

Frozen

entrees



Baked

potatoes



Frozen

vegetables

Custom 

Help

S e n s o r C o o k i n g

Summary of content (24 pages)

PAGE 1
R-1490 R-1491 R-1492 SERVICE MANUAL S4808R1490X// OVER THE RANGE MICROWAVE OVEN MODELS Sensor Coo king Custom Help Popucorn Baked potatoes Reheat Frozen vegetablest Frozen entrees Frozen vegetables Ground meat Rice Fresh/ seafood Compu Cook 1 2 6 7 Power Level Turntable On/Off Work Light Compu Defrost 3 4 8 9 Kitchen Timer Clock Stop Clear Night Light R-1490 R-1491 R-1492 5 0 Minute Plus Start Touch On In the interest of user-safety the oven should be restored to its original con
PAGE 2
R-1490 R-1491 R-1492 PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open.
PAGE 3
R-1490 R-1491 R-1492 WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing 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 Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage When the testing is completed, 1.
PAGE 4
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/cm2 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/cm2 at any point 5cm or more from the external surface of the oven.
PAGE 5
R-1490 R-1491 R-1492 SERVICE MANUAL OVER THE RANGE MICROWAVE OVEN R-1490/ R-1491/1492 FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the 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//).
PAGE 6
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 1700 watts Width 29-15/16" Height 16-3/8" Depth 15- 1/4" (Not including the door handle) Width 20-1/4" Height 8-3/16" Depth 14-1/2" 2 bulbs, 30W x 2, Incandescent light bulbs Approx. 300 C.F.M. Convection Power Output Case Dimensions Cooking Cavity Dimensions 1.
PAGE 7
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. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood system mounting location.
PAGE 8
R-1490 R-1491 R-1492 OPERATION DESCRIPTION OF OPERATING SEQUENCE NOTE: During this first stage, do not open the door or touch STOP/CLEAR pad. 4. When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero. At this time, the door may be opened to stir food, turn it or season, etc. 5. When the timer reaches zero, an audible signal sounds.
PAGE 9
R-1490 R-1491 R-1492 MAGNETRON TEMPERATURE FUSE CONTROL UNIT COM. N.O. F1 RY4 RY5 POWER TRANSFORMER F3 N.C. GRN B1 Low HOOD CAPACITOR 120 V AC. GND 60 Hz E2 RY3 A3 B9 A7 N.O. TTM HOOD LAMP HL RY1 A5 HL FAN MOTOR A1 TURNTABLE MOTOR HOOD MOTOR WHT F2 E1 FM DOOR SENSING SWITCH RY2 HIGH VOLTAGE CAPACITOR 0.94µF COM.
PAGE 10
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. These tests are given a procedure letter which will be found in the "Test Procedure "section.
PAGE 11
R-1490 R-1491 R-1492 TEST PROCEDURES PROCEDURE LETTER M COMPONENT TEST KEY UNIT TEST 1. 2. 3. 4. 5. 6. 7. 8. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor.
PAGE 12
R-1490 R-1491 R-1492 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (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. (4) Touch Reheat pad once and touch the Start pad, Now, the oven is in the sensor cooking condition and “REHEAT” "SENSOR" and "COOK" will appear in the display. (5) The oven will operate for the first 16 seconds, without generating microwave energy.
PAGE 13
R-1490 R-1491 R-1492 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (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. (15) Reconnect all leads removed from components during testing and repairing. (16) Re-install the outer case (cabinet). (17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.
PAGE 14
R-1490 R-1491 R-1492 ABSOLUTE HUMIDITY SENSOR CIRCUIT the food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN6 terminal of the LSI.
PAGE 15
R-1490 R-1491 R-1492 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven.
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. 17.Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with a small flat type screw driver. 18.Now, the oven lamp socket is free. 19.Release the harness of the AH sensor assembly from three (3) wire holders of the hood duct. 20.Remove two (2) screws holding the AH sensor assembly to the hood duct. 21.Now, the AH sensor assembly is free.
PAGE 17
1 2 1 9 RY2 RY5 3 15 N.O. COM. RY1 75 31 CN-A 4 ORG ORG RED BLK RED ORG RED 1 RED N.C. 5 SECONDARY INTERLOCK SWITCH COM. MONITOR SWITCH BLK N.O. COM.
PAGE 18
5 B9 A5 A3 A1 B1 LOW MICRO N.O. FAN MOTOR OVEN LAMP STIRRER MOTOR COM N.O. COM COM(H) HOOD MOTOR B3 B5 B7 HIGH HOOD THERMO COM HOOD LAMP TURNTABLE MOTOR MOTOR RUN CAPACITOR NO 3 13 RY2 RY1 NC RY5 RY4 S101D01 2 VRS1 11 SSR1 RY3 R20 1k 1/2w C1 0.1µ/50v C2 1000µ/35v + – D30 ZD2 HZ16-1 E1 Q30 KRA101M + – R3 680 1w ZD3 HZ5C2 Q40 KRA101M (J4) C6 10µ/35v F1 (A) (J3) Q3 KRA101M VC F3 F2 AH SENSOR (C) (B) CF1 CST4.
PAGE 19
R-1490 R-1491 R-1492 PARTS LIST Note: The parts marked “∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. "§" MARK: PARTS DELIVERY SECTION PART NO.
PAGE 20
R-1490 R-1491 R-1492 REF. NO. D20 D25-28 D30-31 D70-77 IC1 IC2 Q1 Q3 Q4 Q20 Q24-26 Q27 Q28 Q30 R1 R2 R3 R4 R7-8 R10 R20 R30 R31 R40 R70-73 R76-83 R91-93 R100 R110 RY1-2 RY3-4 RY5 SSR1 SP40 T1 VRS1 ZD1 ZD2 ZD3 ZD4 3- 2 3- 2 3- 2 3- 2-1 3- 2-1 3- 2-1 3- 2-2 3- 3 PART NO.
PAGE 21
R-1490 R-1491 R-1492 REF. NO. 4-24 PART NO. PCUSUB034MRP0 § M DESCRIPTION Cab.
PAGE 22
R-1490 R-1491 R-1492 2 1 4 3 6 5 7-3 OVEN AND CABINET PARTS 4-1 7-10 A A 7-3 6-16 1-18 1-14 4-13 2-1 7-5 4-19 7-3 4-10 2-5 B B 7-3 4-12 4-11 1-3 4-24 7-4 1-12 2-6 1-15 C 7-1 4-23 C 1-16 1-13 1-17 7-3 7-5 7-8 1-5 4-18 7-3 6-16 1-3 6-10 7-3 D D 7-9 4-7 4-18 6-12 4-16 E 4-20 2-2 4-9 6-9 4-6 1-10 7-6 7-9 1-9 6-8 4-8 4-5 4-22 1-4 6-8 6-14 1-11 7-7 7-3 7-8 1-10 4-4 F 7-1 1-7 4-15 7-8 6-13 4-14 1-2 4-17 7-8 F 4-3 E 7-3 1-8 1-1 1-6 4-15 2
PAGE 23
R-1490 R-1491 R-1492 2 1 4 3 6 5 CONTROL PANEL PARTS 3-3 3-2 3-1E A 3-2-2 A 3-1 3-2-1 3-3 DOOR PARTS 7-3 3-3 B B 5 4-21 5-4 5-6 5-1 C C 5-6 5-2-1 5-3 D D 5-6 5-2-3 E E 5-2 5-2-2 5-5 MISCELLANEOUS 5-2-4 6-1 F F 6-1-1 6-1-4 6-1-5 6-7 6-1-2 6-6 6-1-6 6-1-7 6-1-3 G G 6-11 H H 1 2 4 3 21 5 6
PAGE 24
R-1490 R-1491 R-1492 2 1 4 3 6 5 PACKING AND ACCESSORIES A A TOP PAD SPADBB026MRE0 DOOR PROTECTOR SPADP0221MRE0 B B TRAY PACK SPADPB037MRE0 4-3 TURNTABLE TRAY C 6-1 INSTALL MATERIAL ASSEMBLY WRAP COVER SSAKH0103MRE0 C 6-3 OPERATION MANUAL 6-5 WALL TEMPLATE D D 6-2 INSTALLATION INSTRUCTION 6-4 TOP TEMPLATE E E 6-13 GREASE FILTER (x 2) BOTTOM PAD SPADBB025MRE0 F F Non-replaceable items G G PACKING CASE H H 1 2 4 3 5 6 COPYRIGHT © 1998 BY SHARP CORPORATION ALL RIGHTS RESERVED.