Table of Contents
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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 .............................................................................................................................. 9
TEST PROCEDURE ............................................................................................................................................ 10
TOUCH CONTROL PANEL ................................................................................................................................. 20
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 26
PICTORIAL DIAGRAM ........................................................................................................................................ 33
POWER UNIT CIRCUIT ...................................................................................................................................... 34
CPU UNIT CIRCUIT ............................................................................................................................................ 35
PRINTED WIRING BOARD ................................................................................................................................. 36
PARTS LIST ........................................................................................................................................................ 37
PACKING AND ACCESSORIES ......................................................................................................................... 41
SHARP CORPORATION
SERVICE MANUAL
MODELS
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
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
MICROWAVE OVEN
R-330BK
R-330BW
R-330BK
R-330BW
S2806R330BPW/
Page
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Summary of Contents for Sharp R-330BK
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Page 1: Table Of Contents
R-330BK R-330BW SERVICE MANUAL S2806R330BPW/ MICROWAVE OVEN R-330BK MODELS R-330BW 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-... -
Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800-237-4277. If the unit operates with the door open, service person should 1) tell the user not to operate the oven and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's Center for Devices and Radiological Health immediately. -
Page 3: Warning To Service Personnel
R-330BK R-330BW WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing 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 Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc.. -
Page 4: Microwave Measurement Procedure
R-330BK R-330BW 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/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition... - Page 5 MICROWAVE OVEN R-330BK / R-330BW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-330BK, R-330BW. It is recommended that service personnel carefully study the entire...
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Page 6: General Information
R-330BK R-330BW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 11-7/8" Depth 15-7/8" Cooking Cavity Dimensions Width 13-3/4"... -
Page 7: Oven Diagram
R-330BK R-330BW A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord. Grounded 3-Pronged Plug Receptacle Box Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact a qualified... -
Page 8: Operation
R-330BK R-330BW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during relay and is mechanically associated with the door so oven operation. that it will function in the following sequence. (1) When the door opens from the closed position, the primary... - Page 9 R-330BK R-330BW enough steam from the food, it relays the information to its 3. Sensor detects moisture and humidity and calculates microprocessor which will calculate the remaining cooking cooking time and variable power. time and power level needed for best results. When the food Cooking Sequence.
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Page 10: Description And Function Of Components
R-330BK R-330BW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. COOKING TIME PROGRAMMED 3. VARIABLE COOKING CONTROL "HIGH" 4. "START" PAD TOUCHED THERMAL MONITOR THERMAL CUT-OUT (OVEN) FUSE 20A CUT-OUT (MG.) COM. POWER N.O. TRANSFORMER (RY-2) (RY-1) PRIMARY INTERLOCK... -
Page 11: Troubleshooting Guide
R-330BK R-330BW PRIMARY INTERLOCK RELAY (RY2), RELAY the monitor switch closes. (RY1), SECONDARY INTERLOCK SWITCH 2. If the wire harness or electrical components are short- AND MONITOR SWITCH FOR PROPER OP- circuited, this monitor fuse blows to prevent an electric ERATION. -
Page 12: Test Procedure
R-330BK R-330BW CK = Check / RE = Replace RE RE A B C D E F F G H RE RE CK I CKCK CK J K L M N TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows... - Page 13 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4. 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. 5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.
- Page 14 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE RECTIFIER TEST 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. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading.
- Page 15 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 8. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT. SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case.
- Page 16 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER continuity of the monitor circuit. 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed.
- Page 17 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7) Reconnect the power supply cord after the outer case is installed. 8) Run the oven and check all functions. The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all.
- Page 18 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. Reconnect all leads removed from components during testing. 6. Re-install the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions.
- Page 19 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER FOIL PATTERN ON THE PRINTED WIRING BOARD TEST To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse.
- Page 20 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER AH SENSOR TEST Checking the initial sensor cooking condition WARNING : The oven should be fully assembled before following procedure. (1) The oven should be plugged in at least two minutes before sensor cooking.
- Page 21 R-330BK R-330BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CHECKING CONTROL UNIT (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 the sensor connector that is mounted to control panel.
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Page 22: Touch Control Panel
R-330BK R-330BW 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 23 R-330BK R-330BW LSI(IZA866DR) The I/O signal of the LSI(IZA866DR) is detailed in the following table. Pin No. Signal Description Signal coming from touch key. When either G12 line on key matrix is touched, a corresponding signal out of P20 - P27 will be input into AN8.
- Page 24 R-330BK R-330BW Pin No. Signal Description 0.1 sec. Signal to sound buzzer (2.0 kHz). H : GND A: key touch sound. L : -5V 2.0 sec. B: Completion sound. H : GND L : -5V Terminal not used. Common data signal: COM5.
- Page 25 R-330BK R-330BW Pin No. Signal Description Power source voltage: GND (0V). The power source voltage to drive the LSI is input to VCC terminal. 80-84 P10-P14 Used for initial balancing of the bridge circuit (absolute humidity sensor). 85-86 P15-P16 Terminal not used.
- Page 26 R-330BK R-330BW ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor sensor cooking mode, 16 seconds clearing cycle occurs The absolute humidity sensor includes two thermistors than the detector circuit starts to function and the LSI as shown in the illustration. One thermistor is housed in observes the initial voltage available at its AN1 terminal.
- Page 27 R-330BK R-330BW TOUCH CONTROL PANEL SERVICING 4) Re-install the outer case (cabinet). 1. Precautions for Handling Electronic Components 5) Re-connect the power supply cord after the outer case This unit uses CMOS LSI in the integral part of the circuits.
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Page 28: Component Replacement And Adjustment Procedure
4. If the outer case (cabinet) is not fitted. WARNING FOR WIRING To prevent an electric shock, take the following pre- 3) Sharp edge: cautions. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, Chassis support and other metallic plate. -
Page 29: Pictorial Diagram
R-330BK R-330BW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CA- PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. Special screw NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. - Page 30 R-330BK R-330BW MAGNETRON REMOVAL Removal 4. Reconnect the wire leads to the magnetron. Refer to 1. Disconnect the power supply cord and remove outer case. "PICTORIAL DIAGRAM" on page 33. 2. Open the door and block it open. 5. Re-install outer case and check that the oven is operating 3.
- Page 31 4. Where the corners have been snipped off bend corner 7. Now the turntable motor is free. areas flat. No sharp edges must be evident after removal 8. After replacement use the one (1) screw to fit the of the turntable motor cover.
- Page 32 R-330BK R-330BW Coil Groove joint pliers Shaft Shaft These are the positions Stator Axis that should be pinched with pliers Center of Table Stator bracket Bracket Rotor Rotor Rear View Side View DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Re-install 1.
- Page 33 R-330BK R-330BW 4. Pry the principles of the lever and lift up the choke cover procedure of item 15 of "REMOVAL". by inserting a putty knife as shown Figure C-6. 2. Re-install the latch spring to the latch head. Re-install the 5.
- Page 34 R-330BK R-330BW SEALER FILM Installation 1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-8. 2. Tear the backing film by pulling the adhesive tape. 3. Put the pasted side of the sealer film on the door panel...
- Page 35 R-330BK R-330BW...
- Page 36 R-330BK R-330BW R4 27 Q2 2SB1238 D1-D4 R5 4.7k 11ES1 AC120V 60Hz – – 2SB1238 R2 680 1/2w TURNTABLE MOTOR BUZZER OVEN LAMP N.O. MOTOR R6 3.3k TURNTABLE MOTOR OVEN LAMP 10µ/35v – MOTOR Q3 DTD143ES MICRO N.O. MICRO N.C.
- Page 37 R-330BK R-330BW...
- Page 38 R-330BK R-330BW WH - 1 (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-4. Printed Wiring Board of Power Unit...
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Page 39: Power Unit Circuit
Varistor (10G471K) VHEHZ161///-1 Zener diode (HZ16-1) 3- 2 DPWBFB756WRK0 CPU unit 3- 3 FPNLCB360WRK0 Control panel frame with key unit [R-330BK] 3- 3 FPNLCB361WRK0 Control panel frame with key unit [R-330BW] 3- 3-1 FUNTKA854WRE0 Key unit [R-330BK] 3- 3-1 FUNTKA855WRE0... - Page 40 To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION Order Parts from the authorized SHARP parts Distributor for your area. Defective parts requiring return should be returned as indicated in the Service Policy.
- Page 41 R-330BK R-330BW OVEN AND CABINET PARTS 1-11 1-10 4-17 4-20 1-15 1-13 4-16 4-10 4-21 4-22 6-10 4-15 4-12 4-14 1-12 4-23 4-11 4-19 1-14 4-13...
- Page 42 R-330BK R-330BW CONTROL PANEL PARTS 3-1B DOOR PARTS 3-3-1 4-18 3-3-3 3-3-2 MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.
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Page 43: Packing And Accessories
R-330BK R-330BW PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA341WRK0 DOOR PROTECTION SHEET CABINET COVER (for R-330BK) SPADPA204WRE0 SPAKHA003WRE0 PLASTIC BAG SSAKHA034WRE0 6- 8 INSTRUCTION BOOK & PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA342WRK0 6- 1 TURNTABLE SUPPORT... - Page 44 No part of this publication may be repro- duced, stored in retrieval systems, or trans- mitted in any form or by any means, elec- tronic, mechanical, photocopying, record- ing, or otherwise, without prior written per- mission of the publisher. '98 SHARP CORP. (2S2.530E) Printed in U.S.A...