R-1872 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.
R-1872 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.
R-1872 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.
R-1872 PRODUCT DESCRIPTION SERVICE MANUAL GENERAL INFORMATION MICROWAVE OVEN R-1872 OPERATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-1872. WIRING DIAGRAM The model R-1872 is quite similar to base model R-1850 (Ref.
R-1872 SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.2 Amperes (Microwave), 13.2 Amperes (Convection) 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.
R-1872 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.
R-1872 OPERATION DESCRIPTION OF OPERATING SEQUENCE of the primary and secondary switch and secondary interlock relay and is mechanically associated with the door so that it will function in the following sequence. (1) When the door opens from a closed position, the secondary interlock relay, door sensing switch, primary and secondary switch open their contacts, and then the monitor switch contacts close.
R-1872 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. MAGNETRON TEMPERATURE FUSE RED COM. RY1 CONTROL UNIT BLK BRN PNK N.O. RY2 C3 AH SENSOR E4 STM HIGH VOLTAGE CAPACITOR 0.9∝F DAMPER SWITCH WHT THERMISTOR E3 MAGNETRON BLK E6 BLK F3 WHT GRN PNK DOOR SENSING SWITCH E5 F2 BLK BLK F1 E2 E1 RED PPL PPL BRN BRN YLW N.O. RY3 WHT WHT GRY COM.
R-1872 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CONVECTION PAD TOUCHED. 3. DESIRED TEMP. TOUCHED. 4. START PAD TOUCHED. MAGNETRON TEMPERATURE FUSE RED COM. RY1 CONTROL UNIT BLK BRN PNK N.O. RY2 C3 AH SENSOR E6 E4 STM HIGH VOLTAGE CAPACITOR 0.9∝F DAMPER SWITCH WHT THERMISTOR E3 MAGNETRON BLK E5 F3 BLK F2 WHT HIGH VOLTAGE RECTIFIER WHT GRN PNK RED HEATING ELEMENT DOOR SENSING SWITCH F1 BLK BLK E2 E1 PPL PPL BRN YLW N.O.
R-1872 PROCEDURE LETTER COMPONENT TEST Note: When defective components, the Control Unit or Key Unit are replaced, the defective part or parts must be properly packed for return in the shipping carton, with its cushion material, in which the new replacement part was shipped to you.
BLK 1 PNK WHT BRN 2 GRN GRY to oven cavity front flange N.O. GRN COM. R E D BLK GRN Power Supply cord 120V 60Hz TEMPERATURE FUSE (MG.) WHT DOOR SENSING SWITCH 2 WHT 1 GRN GRN 1 BLU STIRRER MOTOR PNK 3 BLK GRY B L K CONVECTION MOTOR 2 2 RY2: PRIMARY INTERLOCK RELAY BLK BLK YLW 5 RED RED 4 YLW BLU 3 WHT PPL 2 BLK GRN R-1872 HOOD FAN MOTOR 6 1 5 4 3 A BLK B 1 CN-E 6 C D E F G H AH. SENSOR 3 WHT CN-F 2 RED 1 BLK WHT GRN WHT BLK COM. CN-G CN-E RED RY3 N.O.
C50.01µ 16v C7 C8 R50 15k R63 220F R64 3.6kF R51 4.7k R62 36kF D28 C30 Q28 KRA101M NO D29 CONVECTION HERTER COM R30 15k RY3 R31 4.7k C60 CF1 4MHz Q29 KRA101M (B) 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 22 23 24 25 26 27 28 29 1G 2G 3G 4G 5G 6G 7G 8G G3 G4 G5 R82 3.3k D76 R81 D75 3.3k R80 D74 3.3k 3.
R-1872 PARTS LIST ∆” may cause undue microwave exposure. Note: The parts marked “∆ The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION. REF. NO. PART NO.
R-1872 REF. NO. D1-4 D20-32 D65 D70-76 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 R65 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- 2-6 3- 3 PART NO.
R-1872 REF. NO. 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23 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 PART NO.
R-1872 REF. NO. PART NO.
R-1872 2 1 4 3 6 5 OVEN AND CABINET PARTS A A 1-17 7-25 4-1 4-49 7-24 7-7 7-24 B 4-48 B 2-10 4-38 4-50 4-45 4-15 7-11 4-35 4-24 7-24 7-24 4-36 1-21 4-23 7-3 4-44 7-11 4-39 7-17 C 2-5 1-13 C 4-37 1-7 2-6 7-3 7-17 7-20 4-43 4-19 7-11 7-7 4-21 7-3 1-18 7-21 7-14 7-15 1-16 7-23 7-7 7-7 1-20 D 4-51 1-6 D 1-3 1-4 4-17 7-14 7-1 4-9 4-10 7-20 7-4 4-18 4-7 4-4 2-9 6-13 1-15 1-2 4-11 4-12 E 1-1 4-42 7-12 7-25 7-12 4-16 1-11 7-22 7-26 4-12 7-1
R-1872 2 1 4 3 6 5 CONTROL PANEL PARTS A A 3-2 3-3 3-1 3-2-2 3-2-6 DOOR PARTS 3-2-1 B B 4-34 7-7 3-3 5-9 5-4 3-2-5 3-2-4 C C 5-6 5-1 3-2-3 5-9 5-5 D D 5 5-7 5-8 5-3 E E MISCELLANEOUS 5-2 6-1 6-8 F 6-1-1 6-6 6-1-4 F 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 17 5 6
R-1872 PACKING AND ACCESSORIES 2-1 GREASE FILTER (x 2) 6-4 TOP TEMPLATE 6-5 WALL TEMPLATE 6-2 INSTALLATION INSTRUCTION 6-7 COOK BOOK 6-3 OPERATION MANUAL 6-1 INSTALL MATERIAL ASSEMBLY TOP PAD 4-1 EXHAUST DAMPER ASSEMBLY 4-3 TURNTABLE TRAY DOOR PROTECTOR 6-10 WRAP COVER 6-9 ACCESSORY PACK BOTTOM PAD Non-replaceable items PACKING CASE 18
R-1872 Notes 19
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R-1872 Notes 21
R-1872 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. (6M2.42E) Printed in U.S.