Sharp R-330H Service Manual
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Sharp R-330H Service Manual

Sharp R-330H Service Manual

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CAUTION, MICROWAVE RADIATION ............................................................................................................. 1
WARNING .......................................................................................................................................................... 1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW ....................................................................................................................................... 3
OPERATION SEQUENCE ................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................ 5
SERVICING AND TROUBLESHOOTING GUIDE ............................................................................................ 6
TEST PROCEDURE ......................................................................................................................................... 8
TOUCH CONTROL PANEL ............................................................................................................................. 14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 19
MICROWAVE MEASUREMENT .................................................................................................................... 25
WIRING DIAGRAM ......................................................................................................................................... 26
PICTORIAL DIAGRAM ................................................................................................................................... 27
CONTROL UNIT CIRCUIT .............................................................................................................................. 28
PRINTED WIRING BOARD ............................................................................................................................. 29
PARTS LIST ................................................................................................................................................... 30
SERVICE MANUAL
MODEL
In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.

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SHARP CORPORATION
MICROWAVE OVEN
R-330H
R-330H
S8305R330HPJ/
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  • Page 1: Table Of Contents

    R-330H SERVICE MANUAL S8305R330HPJ/ MICROWAVE OVEN R-330H MODEL In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. TABLE OF CONTENTS Page CAUTION, MICROWAVE RADIATION ......................1 WARNING ................................
  • Page 2 R-330H...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN R-330H APPEARANCE VIEW GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service OPERATING SEQUENCE engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render FUNCTION OF IMPORTANT satisfactory customer service.

  • Page 4: Product Specifications

    R-330H PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.6kW Power Output 1100 watts nominal of RF microwave energy (IEC Test Procedure) Operating frequency 2450 MHz Case Dimensions Width 520 mm...

  • Page 5: Appearance View

    R-330H APPEARANCE VIEW 1. Door open button 8. Touch control panel 2. Door safety latches 9. Liquid crystal display 3. Removable turntable support 10.Coupling 4. Removable turntable tray 11.Waveguide cover 5. Oven lamp 12.Power supply cord 6. See through door 13.Door hinges...

  • Page 6: Operation Sequence

    R-330H OPERATION SEQUENCE OFF CONDITION because the relay RY1 stays closed. Shown in the display is the remaining time. Closing the door activates all door interlock switches (1st. latch switch and 2nd. interlock relay control switch). MONITOR SWITCH CIRCUIT IMPORTANT...

  • Page 7: Function Of Important Components

    R-330H FUNCTION OF IMPORTANT COMPONENTS OVEN TEMPERATURE FUSE DOOR OPEN MECHANISM The temperature fuse, located on the top of the oven he door is opened by pushing the open button on the cavity, is designed to prevent damage to the oven by fire.

  • Page 8: Servicing And Troubleshooting Guide

    If the water remains cold carry out 3D checks and re- examine the connections to the component being Sharp recommend that wherever possible fault-finding tested. is carried out with the supply disconnected. It may in, some cases, be necessary to connect the supply after...
  • Page 9 R-330H CK = Check / RE = Replace TEST PROCEDURE A B C D E E F G G H K L M N RECK CK RE CK CKCK CK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power supply cord is plugged into wall outlet.

  • Page 10: Test Procedure

    R-330H TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECK. Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal.
  • Page 11 R-330H TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Room temperature ....To = 21˚C Initial temperature ....T1 = 11°C Temperature after (38 + 3) = 41 sec..............T2 = 21°C Temperature difference Cold-Warm .............. ∆T1 = 10°C Measured output power The equation is “P = 110 x ∆T”...
  • Page 12 R-330H TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS. A. Isolate the high voltage capacitor from the circuit. B. Continuity check must be carried out with measuring instrument which is set to the highest resistance range.
  • Page 13 R-330H TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Table: Resistance of Motor Motors Resistance Approximately 250 Ω Fan motor Turntable motor Approximately 14.5 kΩ If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS BLOWN FUSE F10A CARRY OUT 3D CHECKS.
  • Page 14 R-330H TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 1. Key Unit. Note: Check key unit ribbon connection before replacement. The following symptoms indicate a defective key unit. Replace the control unit assembly. a) When touching the pads, a certain pad produces no signal at all.
  • Page 15 R-330H TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RY1 and RY2 Relay Test These relays are operated by D.C. voltage. Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation. DC. voltage indicated ....Defective relay.

  • Page 16: Touch Control Panel

    R-330H TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. 3) Power Source Circuit This circuit generates voltages necessary in the control (1) Key Unit unit from the AC line voltage.
  • Page 17 R-330H The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description Signal coming from touch key. When either G9 line on key matrix is touched, a corresponding signal out of P22 - P26 and P31 - P33 will be input into P50.
  • Page 18 R-330H Pin No. Signal Description Magnetron high-voltage circuit driving signal. To turn on and off the cook relay (RY2). The H : GND Maximum signals holds “L” level during microwave cook- output ing and “H” level while not cooking. In other...
  • Page 19 R-330H TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components A. On some models, the power supply cord between the This unit uses CMOS LSI in the integral part of the circuits. touch control panel and the oven itself is so short that the When handling these parts, the following precautions should two can’t be separated.
  • Page 20 R-330H PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder.

  • Page 21: Component Replacement And Adjustment Procedure

    Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures: WARNING FOR WIRING and Oven cavity. To prevent an electric shock, take the following 3) Sharp edge: manners. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, Chassis support and other metallic plate.
  • Page 22 R-330H and filament leads of transformer to magnetron and DIAGRAM". high voltage capacitor. And reconnect the high voltage 4. Reinstall outer case and check that oven is operating fuse to the power transformer. Refer to "PICTORIAL properly. HIGH VOLTAGE RECTIFIER, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR REMOVAL 1.
  • Page 23 8. After replacement use the one (1) screw (XHPSD40P08K00) 4. Where the corners have been snipped off bend corner to fit the turntable motor cover. areas flat. No sharp edges must be evident after removal of the turntable motor cover. COOLING FAN MOTOR REMOVAL REMOVAL CAUTION: 1.
  • Page 24 R-330H * Make sure that the fan blade rotates smooth after * Make sure that the axis of the shaft is not slanted. installation. 6. Connect the wire leads to the fan motor, referring to the pictorial diagram. Coil Shaft...
  • Page 25 R-330H oven cavity front flange. door) should be less than 0.5mm. 2. With door closed, adjust latch hook by moving it back 2. The 1st. latch switch and 2nd. interlock relay control and forth, and up and down. In and out play of the door...
  • Page 26 R-330H cycle. This function does not require that door be SEALER FILM air-tight, moisture (condensation)-tight or light- Installation tight. Therefore, occasional appearance of 1. Put the adhesive tape on the backing film of the sealer moisture, light or sensing of gentle warm air film as shown in Fig.

  • Page 27: Microwave Measurement

    R-330H MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch Recommended instruments are: and door are completed individually or collectively, the NARDA 8100 following leakage test must be performed with a survey NARDA 8200 instrument and it must be confirmed that the result meets...

  • Page 28: Wiring Diagram

    R-330H SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potentials above 250V. 2. CLOCK APPEARS ON DISPLAY TEMPERATURE NOISE FILTER FUSE 150˚C (OVEN) FUSE F10A N.O. COM. RY-2 2ND. INTERLOCK CONTROL RELAY UNIT CAPACITOR 1.07µ...

  • Page 29: Pictorial Diagram

    R-330H...
  • Page 30 R-330H...

  • Page 31: Printed Wiring Board

    R-330H Figure S-3. Printed Wiring Board of Power Unit...

  • Page 32: Parts List

    R-330H 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. DESCRIPTION Q'TY CODE ELECTRIC PARTS 1- 1 QSW-MA147WRZZ 1st. latch / 2nd. interlock relay control relay conrol switch...
  • Page 33 R-330H ∆ Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE ∆ 5- 3 GWAKPA897WRFZ Door frame 5- 4 HPNL-A812WRRZ Door screen ∆...
  • Page 34 R-330H 7-10 OVEN AND CABINET PARTS 7-10 7-10 1-13 1-12 4-15 4-12 7-11 4-16 4-13 7-10 7-10 7-10 4-19 1-11 4-14 4-17 7-12 4-10 4-18 1-10 4-11 4-12 1-14 4-12 7-10 4-20 4-12 7-10...
  • Page 35 R-330H CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration.
  • Page 36 SAKCD964WREZ Not replaceable items. TRAY PAD ASSY (CPADBA317WRKZ) COPYRIGHT © 2003 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.

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