Service manual

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R-1874

SUPPLEMENTAL SERVICE MANUAL

TABLE OF CONTENTS

Page

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO

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

BEFORE SERVICING ...................................................................................................... INSIDE FRONT COVER

MICROWAVE MEASUREMENT PROCEDURE .....................................................................................................1

WARNING TO SERVICE PERSONNEL..........................................................................................................3

FOREWORD ..........................................................................................................................................................4

PRODUCT SPECIFICATIONS ...............................................................................................................................5

GENERAL INFORMATION ...................................................................................................................................5

PICTORIAL DIAGRAM ..........................................................................................................................................7

CONTROL PANEL CIRCUIT ..................................................................................................................................8

PARTS LIST ..........................................................................................................................................................9

PACKING AND ACCESSORIES .........................................................................................................................15

SHARP ELECTRONICS CORPORATION

This document has been published to be used for after sales service only. The contents are subject to change without notice.

Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135

OR:

SHARP CORPORATION

SHARP ELECTRONICS OF CANADA LTD.

Head Office: 335 Britannia Road East, Mississauga, Ontario L4Z 1W9

(905) 890-2100

This is a supplemental Service Manual for Model R-1874.

This model is quite similar to Base Model R-1855A (S/M# S01M177R1875E).

Use this supplemental manual together with the Base Model Service Manual for complete operation and service information

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 contain 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 Rectifier Assembly, High Voltage Harness etc..)

S52M187R1874E

OVER THE RANGE

MICROWAVE OVEN

MODEL R-1874

(IN USA):

(IN CANADA):

MIX CONV

DEFROST

SENSOR

TURNTABLE ON OFF COOK LBS OZ KG HELP

Summary of content (20 pages)

PAGE 1
R-1874 SUPPLEMENTAL SERVICE MANUAL S52M187R1874E MIX CONV DEFROST SENSOR TURNTABLE ON OFF COOK LBS OZ KG OVER THE RANGE MICROWAVE OVEN HELP MODEL R-1874 This is a supplemental Service Manual for Model R-1874. This model is quite similar to Base Model R-1855A (S/M# S01M177R1875E).
PAGE 2
R-1874 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-1874 MICROWAVE MEASUREMENT PROCEDURE (USA) 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.
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R-1874 MICROWAVE MEASUREMENT PROCEDURE (CANADA) After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must be performed with survey instrument and test result must be confirmed to meet the requirement of the performance standard for microwave ovens as undermentioned. A.
PAGE 5
R-1874 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 outer case. 2. Open the door and block it open. 3.
PAGE 6
R-1874 SUPPLEMENTAL SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE OVEN R-1874 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-1874. OPERATION WIRING DIAGRAM The model R-1874 is quite similar to base model R-1855A (Ref.
PAGE 7
R-1874 SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.2 Amperes (Microwave), 13.2 Amperes (Convection) - [UL Rating] 116 Volts / 13.0 Amperes (Microwave), 13.0 Amperes (Convection) - [CFS Rating] 60 Hertz Single phase, 3 wire grounded Power Output 850 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Convection Power Output 1400 watts Case Dimensions Width 29-15/16" Height 16-11/32" Depth 15- 9/32" Cooking Cavity Dimensions 1.
PAGE 8
R-1874 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.
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A B C A B C D HOOD FAN MOTOR BLK 6 BLK 5 4 3 6 YLW BLK 2 WHT BRN GRN 1 PNK N.O. to oven cavity front flange RED BLU PPL 5 RED 4 YLW 3 WHT 2 BLK GRY 1 GRN COM. Power Supply cord 120V 60Hz TEMPERATURE FUSE (MG.) R E D B L K CONVECTION MOTOR 2 2 2 2 BLK GRN BLK 2 WHT 1 GRN GRN WHT DOOR SENSING SWITCH 3 GRY BLU STIRRER MOTOR PNK BLK BLK 1 1 1 1 2 RED GRN RY2: PRIMARY INTERLOCK RELAY D E F G H 1 CN-E E F G H AH.
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A B C D E F G H R-1874 T1 C ONT R OL UNIT 5 C7 R 7 4.7k ZD4 HZ4A2 D28 R 62 36kF R Y3 R 30 15k C 50 D32 C OM Q28 K R A101M D29 NO R 31 4.7k C F 1 4MHz (A) (B ) Q29 K R A101M G 8 (C ) C 72 330pF G 9 C 70 330pF 22 23 24 25 26 27 28 29 1G 2G 3G 4G 5G 6G 7G 8G K G HE L P 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 R 93 100k OZ P2 P3 P4 P5 P6 P7 P8 P9 P 10 P 11 P 12 P 13 P 14 P 15 P 16 G 3 G 4 G 5 G 6 R 82 3.3k D76 R 81 D75 3.3k D74 3.3k 3.3k R 80 R 79 R 78 3.
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R-1874 PARTS LIST "§" MARK: PARTS DELIVERY SECTION. REF. NO. PART NO.
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R-1874 REF. NO. IC1 IC2 Q1 Q3 Q4 Q20-26 Q27 Q28-30 Q40 Q60 Q90 R1 R2 R3 R4 R7-8 R30 R31 R40 R50 R51 R62 R63 R64 R70-74 R75 R76-82 R90-93 R100 RY1-3 RY4-9 RY10 SP40 T1 VRS1 ZD1 ZD2 ZD3 ZD4 3- 2 3- 2-1 3- 2-2 3- 2-3 3- 2-4 3- 2-5 3- 3 PART NO.
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R-1874 REF. NO. 4-24 4-25 4-26 4-27 4-28 4-29 4-30 4-31 4-32 4-33 4-34 4-35 4-36 4-37 4-38 4-39 4-40 4-41 4-42 4-43 4-44 4-45 4-46 4-47 4-48 4-49 4-50 4-51 4-52 4-53 4-54 4-55 4-56 PART NO.
PAGE 14
R-1874 REF. NO. PART NO.
PAGE 15
R-1874 2 1 4 3 6 5 OVEN AND CABINET PARTS 4-52 A A 4-52 4-50 1-17 7-25 4-1 4-50 7-24 4-51 4-16 7-7 B B 7-24 2-10 4-39 4-46 7-11 4-36 4-25 4-56 7-7 C 7-24 7-24 4-37 1-21 4-45 4-24 7-3 7-17 7-5 2-6 7-7 D 2-5 1-13 4-38 1-7 4-20 7-14 7-15 4-44 4-8 7-21 4-18 7-14 4-10 4-11 1-6 1-20 7-23 1-18 4-54 7-7 1-3 4-7 7-1 1-4 7-20 7-4 4-4 1-15 E 7-1 7-25 7-12 7-19 7-22 4-14 7-26 4-13 7-12 2-2 1-20 7-20 4-33 2-4 7-5 1-24 4-23 4-26 4-15 4-50 1-8
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R-1874 2 1 4 3 5 6 A A 3-3 3-2 3-2 -2 3-2 -5 3-2 -1 3-3 6-1 5 B B 7-7 3-1 4-35 3-2 -4 3-2 -3 5-5 C C 5-2 5-10 5-9 5-7 5-6 D D 5-1 5-8 5-3 E E 5-4 6-1 F F 6-8 6-1-1 6-1-4 6-6 6-1-5 6-1-2 6-1-6 6-1-7 6-1-3 G G 6-9 6-10 6-11 H H 1 2 4 3 14 5 6
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R-1874 PACKING AND ACCESSORIES 6-1 INSTALL MATERIAL ASSEMBLY 6-7 COOK BOOK 6-3 OPERATION MANUAL 6-5 WALL TEMPLATE TOP PAD DOOR PROTECTOR WRAP COVER 6-2 INSTALLATION INSTRUCTION 6-4 TOP TEMPLATE 2-1 GREASE FILTER (x 2) 6-10 LOW RACK 6-9 HIGH RACK BOTTOM PAD MILLER MAT 4-3 TURNTABLE TRAY TAPE 4-2 TURNTABLE SUPPORT ASSEMBLY PACKING CASE Non-replaceable items TRAY HOLDER DAMPER HOLDER 4-1 DAMPER ASSEMBLY '96 SHARP CORP. (8K5.550E) Printed in U.S.
PAGE 18
R-1874 NOTES 16
PAGE 19
R-1874 NOTES 17
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R-1874 COPYRIGHT © 2002 BY SHARP CORPORATION ALL RIGHTS RESERVED. 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. '02 SHARP CORP. (10M2.42E) Printed in U.S.