Service manual

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R-305CW

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

FOREWORD AND WARNING ............................................................................................................................... 2

PRODUCT SPECIFICATIONS ..............................................................................................................................3

SCHEMATIC DIAGRAM ........................................................................................................................................4

TEST PROCEDURE ..............................................................................................................................................5

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................................7

POWER UNIT CIRCUIT ........................................................................................................................................ 7

CPU UNIT CIRCUIT ..............................................................................................................................................8

PRINTED WIRING BOARD ...................................................................................................................................9

PARTS LIST ........................................................................................................................................................ 10

PACKING AND ACCESSORIES ......................................................................................................................... 11

S2903R305CPW/

MICROWAVE OVEN

MODEL

R-305CW

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 Rectifier

Assembly, High Voltage Harness etc..)

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

SUPPLEMENTAL SERVICE MANUAL

This is a supplemental Service Manual for Model R-305CW. This model is quite similar to base

model R-308CW. Use this supplemental manual together with the Base Model Service Manual

(Refer No. is S1901R310CPW/) for complete operation, service information, etc..

Power

Level

Timer

Clock

123

456

TO ADJUST QUANTITY

TOUCH PAD AGAIN

Casserole

1

Ground Meat

2

Steaks/Chops

3

Chicken Pieces

Popcorn

Baked

Potatoes

Fresh

Vegetables

Rolls/

Muffins

Beverage

Stop

Clear

START

DEFOST

COOK

NO.

LBS.

CUPS.

OZ.

Summary of content (16 pages)

PAGE 1
R-305CW SUPPLEMENTAL SERVICE MANUAL S2903R305CPW/ MICROWAVE OVEN MODEL NO. LBS. CUPS. OZ. COOK DEFOST M IN R-305CW UT E PLUS TO ADJUST QUANTITY TOUCH PAD AGAIN Casserole Beverage Baked Potatoes Fresh Vegetables Rolls/ Muffins 2 4 3 5 7 Power Level Stop Clear 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.
PAGE 2
R-305CW 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-305CW 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-305CW SERVICE MANUAL MICROWAVE OVEN R-305CW FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-305CW. The model R-305CW is quite similar to base model R-308CW (Refer No. is S1901R310CPW/). It is recommended that service personnel carefully study the entire text of this manual and the base model's manual so that they will be qualified to render satisfactory customer service.
PAGE 5
R-305CW SPECIFICATION ITEM Power Requirements Power Output Case Dimensions Cooking Cavity Dimensions 1.1 Cubic Feet DESCRIPTION 120 Volts / 12.5 Amperes 60 Hertz Single phase, 3 wire grounded 1000 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Width 20-1/2" Height 11-7/8" Depth 16-7/8" Width 14-3/4" Height 8-3/4" Depth 15-3/4" Control Complement Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min. 99 seconds) Microwave Power for Variable Cooking Repetition Rate; P-HI .........
PAGE 6
R-305CW TOUCH CONTROL PANEL NO. LBS. CUPS. OZ. COOK DEFOST M IN U T E P L US TO ADJUST QUANTITY TOUCH PAD AGAIN Casserole Beverage Popcorn Baked Potatoes Fresh Vegetables Rolls/ Muffins U DEFROST COMP 1 Ground Meat 2 Steaks/Chops 3 Chicken Pieces 1 2 3 4 5 6 7 8 9 Power Level 0 Timer Clock Stop Clear SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2.
PAGE 7
R-305CW TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST 1. 2. 3. 4. 5. 6. 7. 8. 9. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. 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 8
R-305CW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) J 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 9
R-305CW COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE MAGNETRON REMOVAL Removal 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. Disconnect wire leads from magnetron. 5. Remove the four (4) screws holding chassis support to magnetron, oven cavity front flange, oven cavity back plate and fan duct. 6. Remove the chassis support from oven. 7. Carefully remove the four (4) screws holding magnetron to waveguide flange.
PAGE 10
C-2 C-4 C-9 C-5 DOOR MICRO (BROWNER) : IF NOT SPECIFIED 1/10W ± 5% Q22 DTA123JKA – + – C20 0.1µ/50v Q30 DTA143EKA Q10 DTA143EKA R41 15k Q20 DTA143EKA Q1 2SA1037AK R4 560 1/2w Q21 DTD143EKA LD1 LD2 LD3 LD4 D40 MA152WA D20 MA152WA NOTE C-1 C-8 C-7 OVEN LAMP TURNTABLE C-6 MOTOR FAN MOTOR NC BUZZER INT VR C1 0.1µ/50v R30 3.3k R2 4.
PAGE 11
R-305CW 2 1 4 3 6 5 A A B B SW (GREEN) CN - C 2 1 9 1 C D1 CN - B SH - B C1 SH - A (D2) DIP C (D3) (D4) SP1 DU D (J1) OM D 7 AC 1 OL TTM FM S P 2 F RY1 4 3 E 2 T1 VRS1 1 CN - A E 1 (XA) AC DU OM OM DU VH F F BROWNER RY3 RY2 MICRO G G H H Figure S-4.
PAGE 12
R-305CW PARTS LIST Note: The parts marked “∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. PART NO.
PAGE 13
R-305CW REF. NO. PART NO.
PAGE 14
R-305CW 2 1 4 3 OVEN AND CABINET PARTS 6 5 7-5 2-1 4-13 7-8 A A 7-5 6-7 4-10 7-1 B B 7-8 1-10 4-17 1-11 6-6 1-4 1-8 7-7 C C 4-7 7-6 7-3 6-9 1-5 D D 7-4 4-18 7-1 4-12 4-3 4-15 1-13 E 1-2 4-14 6-2 4-4 4-2 4-11 4-8 7-6 1-3 1-12 7-3 4-5 1-1 F 7-6 1-14 7-1 6-1 7-6 7-2 1-6 7-5 E 1-7 1-1 4-9 7-5 7-1 F 4-1 2-2 4-16 4-6 2-4 1-9 G G 7-6 2-3 7-6 H H 7-6 7-6 7-6 2-3 1 2 4 3 12 5 6
PAGE 15
R-305CW 2 1 4 3 6 5 3-2 CONTROL PANEL PARTS A A 3-8 3-7 3-3 3-8 3-6 B B 3-1 DOOR PARTS 3-3-1 C C 5-9 5-7 3-4 5-2 3-5 D 5-7 D 5-1 5-8 5-7 E E 5-3 5-7 5-8 5-8 5-8 F F 5-5 5-4 5-6 G G MISCELLANEOUS 6-3 (CAPACITOR) 6-4 H H 6-5 Actual wire harness may be different from illustration.
PAGE 16
R-305CW COPYRIGHT © 1999 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. '99 SHARP CORP. (1S2.530E) Printed in U.S.