Table of Contents
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R-320CW
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 ............................................................................................................................ 10
TEST PROCEDURE ............................................................................................................................................ 12
TOUCH CONTROL PANEL ................................................................................................................................. 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 29
PICTORIAL DIAGRAM ........................................................................................................................................ 35
POWER UNIT CIRCUIT ...................................................................................................................................... 36
CPU UNIT CIRCUIT ............................................................................................................................................ 37
PRINTED WIRING BOARD ................................................................................................................................. 40
PARTS LIST ........................................................................................................................................................ 41
PACKING AND ACCESSORIES ......................................................................................................................... 43
SHARP CORPORATION
SERVICE MANUAL
MODELS
COO K SEN
SOR LBS
KG DEF
HEL P
REH EAT
SEN SOR
CU STO
S E N S
M HEL P
O R C
Bak ed
O O K
Pot ato es
Pop cor n
Fro zen
Ent ree s
Fro zen
Veg etab
les
Ric e
Fre sh
Veg etab
Gro und
les
Mea t
Chi cke n
Bre ast
Fish /
Sea foo d
I N S T A
N T A
Fre sh
C T I O
N
Rol ls/M uffi
ns
Bev era ge
Fro zen
Rol ls/M uffi
C O M P
ns
U D E F
Gro und
R O S T
Mea t
Ste aks /
Cho ps
Chi cke n
1
Pie ces
2
3
4
5
6
7
8
9
o
Kitc hen
Tim er
Clo ck
Min ute
Pow er
Plu s
Lev el
Sto p
Cle ar
Sta rt
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
MICROWAVE OVEN
R-320CD
R-320CK
R-320CW
R-330CK
R-330CW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-320CD/CK/CW
R-330CK/CW
S2904R320CPW/
Page
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Table of Contents
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Summary of Contents for Sharp R-320CD
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Page 1: Table Of Contents
R-320CD/CK/CW R-330CK/CW SERVICE MANUAL S2904R320CPW/ MICROWAVE OVEN R-320CD MODELS R-320CK R-320CW COO K SEN SOR LBS KG DEF HEL P R-330CK REH EAT SEN SOR CU STO S E N S M HEL P O R C Bak ed O O K... -
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-320CD/CK/CW R-330CK/CW 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-320CD/CK/CW R-330CK/CW 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 PRODUCT DESCRIPTION MICROWAVE OVEN R-320CD/ R-320CK/ R-320CW/ R-330CK/ R-330CW 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-320CD, R-320CK, R-320CW, R- 330CK, R-330CW.
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Page 6: General Information
R-320CD/CK/CW R-330CK/CW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13 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 16-7/8" Cooking Cavity Dimensions Width 14-3/4"... -
Page 7: Oven Diagram
R-320CD/CK/CW R-330CK/CW 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
(Figure O-1). (2) When the door is closed from the open position, the 1. The display will show flashing "88:88" (for R-320CD/ monitor switch contacts open first. Then the contacts of CK/CW). The display will show "SHARP SIMPLY the secondary interlock switch and door sensing switch PRESS CLEAR AND PRESS CLOCK"... - Page 9 3. Sensor detects moisture and humidity and calculates cooking time and variable power. Cooking Sequence. 1. Touch one of the SENSOR pads (for R-320CD/CK/CW). Touch one of the SENSOR pads and then touch the Start pad (for R-330CK/CW). NOTE: The oven should not be operated on SENSOR immediately after plugging in the unit.
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Page 10: Oven Schematic-Off Condition
R-320CD/CK/CW R-330CK/CW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potential above 250V. THERMAL MONITOR THERMAL CUT-OUT (OVEN) FUSE 20A CUT-OUT (MG.) COM. POWER N.O. TRANSFORMER (RY-2) (RY-1) PRIMARY... - Page 11 R-320CD/CK/CW R-330CK/CW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM of the monitor switch contacts. CAUTION: BEFORE REPLACING A BLOWN MONITOR The door is opened by pushing the open button on the FUSE TEST THE DOOR SENSING SWITCH, control panel, refer to the Figure D-1.
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Page 12: Troubleshooting Guide
R-320CD/CK/CW R-330CK/CW TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. -
Page 13: Test Procedure
R-320CD/CK/CW R-330CK/CW CK = Check / RE = Replace RE RE A B C D E F F G H RE RE CK I CK CK CK J K L M N TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows... - Page 14 R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY 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. 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 15 R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case.
- Page 16 R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. 8. Run the oven and check all functions.
- Page 17 R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit.
- Page 18 R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. The following symptoms indicate a defective key unit.
- Page 19 (1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) For R-320CD/CK/CW, Close the door, touch the " Steaks / chops " pad once. For R-330CK/CW, Close the door, touch the Compu Defrost pad three times and touch the number...
- Page 20 R-320CD/CK/CW R-330CK/CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (3) The oven is in Compu Defrost cooking condition. (4) The oven will operate as follows WEIGHT 1ST STAGE 2ND STAGE LEVEL TIME LEVEL TIME 0.5lb 42sec. 32sec. (5) If improper operation is indicated, the control unit is probably defective and should be checked.
- Page 21 (2) Place the container on the center of tray in the oven cavity. (3) Close the door. (4) For R-320CD/CK/CW, touch REHEAT SENSOR pad once. Now, the oven is in the sensor cooking condition and “REHEAT” will appear in the display.
- Page 22 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the door. 9-4. For R-320CD/CK/CW, touch REHEAT SENSOR pad once. For R-330CK/CW, touch Sensor Reheat pad and touch the Start pad. 9-5. The control panel is in automatic Sensor operation.
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Page 23: Touch Control Panel
A switch to “tell” the LSI if the door is open or closed. (1) Key Unit 8) Back Light Circuit (2) Control Unit (The Control Unit consists of Power Unit and For R-320CD/CK/CW LSI Unit). A circuit to drive the back light (Light emitting diodes LD1- LD4). - Page 24 R-320CD/CK/CW R-330CK/CW LSI(IZA949DR) : R-320CD/CK/CW The I/O signal of the LSI(IZA949DR) is detailed in the following table. Pin No. Signal Description AN10 Signal coming from touch key. When either G10 line on key matrix is touched, a corresponding signal out of P10 - P17 will be input into AN10.
- Page 25 R-320CD/CK/CW R-330CK/CW Pin No. Signal Description Oven lamp, fan motor and turntable motor driving signal To turn on and off shut off relay (RY1). The 16.7 msec. H : GND square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit.
- Page 26 R-320CD/CK/CW R-330CK/CW Pin No. Signal Description SEG10 Terminal not used. 56-82 Segment data signal. SEG11-SEG37 Signal similar to SEG1. 83-85 Terminal not used. SEG38-SEG40 Terminal not used. Signal similar to AN10. When either G13 line on key matrix is touched, a corresponding signal will be input into P41.
- Page 27 R-320CD/CK/CW R-330CK/CW Pin No. Signal Description P42 terminal while one of G6 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and P42 terminal while one of G5 line keys on key matrix is touched.
- Page 28 R-320CD/CK/CW R-330CK/CW Pin No. Signal Description 27-29 P30-P32 Terminal not used. 30-34 P33-P37 Used for initial balancing of the bridge circuit (absolute humidity sensor). CVCC Connected to GND. Power source voltage: -5.0V. The power source voltage to the LSI is input to VSS terminal. Connected to VC.
- Page 29 R-320CD/CK/CW R-330CK/CW ABSOLUTE HUMIDITY SENSOR CIRCUIT which the resistance balance of the bridge circuit is (1) Structure of Absolute Humidity Sensor deviated to increase the voltage available at AN1 terminal The absolute humidity sensor includes two thermistors of the LSI.
- Page 30 R-320CD/CK/CW R-330CK/CW TOUCH CONTROL PANEL SERVICING 3) Re-connect the leads to the primary of the power 1. Precautions for Handling Electronic Components transformer. This unit uses CMOS LSI in the integral part of the 4) Re-install the outer case (cabinet).
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Page 31: 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 32: Pictorial Diagram
R-320CD/CK/CW R-330CK/CW 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. NOTE: When replacing the outer case, the 2 special Special screw Torx screws must be reinstalled in the same locations. - Page 33 R-320CD/CK/CW R-330CK/CW MAGNETRON REMOVAL Removal Re-install 1. Disconnect the power supply cord and then remove 1. Re-install the magnetron to waveguide flange with the outer case. four (4) screws. 2. Open the door and block it open. 2. Insert the two (2) tabs of the chassis support to the oven 3.
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Page 34: Cpu Unit Circuit
R-320CD/CK/CW R-330CK/CW 3. Stick the key unit firmly to the control panel frame Ribbon cable by rubbing with soft cloth not to scratch. CPU UNIT NOTE: Handle the CPU unit carefully so that the ribbon cable does not come off. Because the ribbon cable is glued on the LCD and the printed wiring board only by heated paste. - Page 35 7. Now the turntable motor is free. 4. Where the corners have been snipped off bend corner 8. After replacement use the one (1) screw to fit the areas flat. No sharp edges must be evident after removal turntable motor cover. of the turntable motor cover.
- Page 36 R-320CD/CK/CW R-330CK/CW 4. Pry the choke cover by inserting a putty knife as shown approved microwave survey meter. (Refer to Microwave Figure C-4. Measurement Procedure.) 5. Release choke cover from door panel. Note: The door on a microwave oven is designed to act as 6.
- Page 37 R-320CD/CK/CW R-330CK/CW RECTIFIER H.V.
- Page 38 R-320CD/CK/CW R-330CK/CW CN-C 12PIN LEAD WIRE HARNESS Q2 2SB1238 R4 27 R5 4.7k D1-D4 11ES1 CN-A 1SS270A 1SS270A – – R3 510 1/2w Q1 2SB1238 R2 680 1/2w SP1 PKM22EPT OVEN LAMP TURNTABLE MOTOR FAN MOTOR Q3 KRC243M BUZZER R6 3.3k...
- Page 39 R-320CD/CK/CW R-330CK/CW COM2 COM1 COM0 SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG6 SEG10 SEG7 SEG11 SEG8 SEG12 SEG9 SEG13 SEG10 SEG14 SEG11 SEG15 SEG12 SEG16 SEG13 SEG17 SEG14 SEG18 SEG15 SEG19 SEG16 SEG20 SEG17 SEG21 SEG18...
- Page 40 R-320CD/CK/CW R-330CK/CW SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 TEST SEG20 OSC1 OSC2 /25v 0.01 C100 AVSS AN11 SEG35 AN10 1.5k R110 /25v 0.01 C110 R111 4.7k /25v 0.01 330pF/50v (J16) (J17) 330pF/50v 4.7k...
- Page 41 R-320CD/CK/CW R-330CK/CW SENSOR DEFROST COOK HELP SEG9 SEG35 SEG8 SEG36 SEG7 SEG37 SEG6 SEG38 SEG5 SEG39 SEG4 COM16 SEG3 COM15 /50v SEG2 COM14 SEG1 COM13 C129 SEG0 COM12 COM7 COM11 COM6 COM10 COM5 COM9 COM4 COM8 COM3 COM2 COM1 COM0...
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Page 42: Printed Wiring Board
R-320CD/CK/CW R-330CK/CW (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-6. Printed Wiring Board of Power Unit... -
Page 43: Parts List
3- 3 FPNLCB423WRK0 Control panel frame with key unit [R-330CK] 3- 3 FPNLCB424WRK0 Control panel frame with key unit [R-320CW] 3- 3 FPNLCB425WRK0 Control panel frame with key unit [R-330CW] 3- 3 FPNLCB432WRK0 Control panel frame with key unit [R-320CD]... - Page 44 FUNTKA924WRE0 Key unit [R-330CK] 3- 3-1 FUNTKA925WRE0 Key unit [R-320CW] 3- 3-1 FUNTKA926WRE0 Key unit [R-330CW] 3- 3-1 FUNTKA934WRE0 Key unit [R-320CD] 3- 4 JBTN-B100WRF0 Open button [R-320CK] 3- 4 JBTN-B100WRF0 Open button [R-330CK] 3- 4 JBTN-B101WRF0 Open button [R-320CW]...
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Page 45: Packing And Accessories
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. PACKING AND ACCESSORIES TOP PAD ASSEMBLY... - Page 46 R-320CD/CK/CW R-330CK/CW OVEN AND CABINET PARTS 4-18 4-13 4-17 1-15 4-10 1-10 1-11 4-19 4-20 4-12 1-13 4-15 4-14 4-11 1-12 1-14 4-16...
- Page 47 R-320CD/CK/CW R-330CK/CW CONTROL PANEL PARTS 3-3-1 3-3-1 R-330CK/CW R-320CD/CK/CW DOOR PARTS MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.
- Page 48 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. '99 SHARP CORP. (2S2.530E) Printed in U.S.A...