Table of Contents
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R-308CW
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 ................................................................................................................................. 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 22
PICTORIAL DIAGRAM ........................................................................................................................................ 28
POWER UNIT CIRCUIT ...................................................................................................................................... 29
CPU UNIT CIRCUIT ............................................................................................................................................ 30
PRINTED WIRING BOARD ................................................................................................................................. 32
PARTS LIST ........................................................................................................................................................ 33
PACKING AND ACCESSORIES ......................................................................................................................... 37
SHARP CORPORATION
SERVICE MANUAL
MODELS
MINUTE PLUS
INSTA NT ACTIO N
TO ADJUST QUANTITY - TOUCH PAD AGAIN
Dinner
Casserole
Plate
Popcorn
Baked
Fresh
Beverage
Potatoes
Vegetables
Frozen
Frozen
Rolls/
Entress
Vegetables
Muffins
1 Ground Meat
2 Steaks/Chops
3 Chicken Pieces
COMPU DEFROST
1
2
3
4
5
6
7
8
9
Power
Timer
0
Level
Clock
Stop
START
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.
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-308CK
R-308CW
R-310CK
R-310CW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R - 30 8 CK
R -308 CW
R - 31 0 CK
R -310 CW
S1901R310CPW/
Page
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Summary of Contents for Sharp R-308CK
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Page 1: Table Of Contents
R - 30 8 CK R -308 CW R - 31 0 CK R -310 CW SERVICE MANUAL S1901R310CPW/ MICROWAVE OVEN R-308CK MODELS R-308CW MINUTE PLUS INSTA NT ACTIO N TO ADJUST QUANTITY - TOUCH PAD AGAIN R-310CK Dinner Casserole... -
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 -308CK R-308CW R -310CK R -310CW 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-3 0 8CK R-308CW R -310 CK R-310CW 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 by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm at any point 5cm or more from the external surface of the oven. -
Page 5: Foreword And Warning
PRODUCT DESCRIPTION MICROWAVE OVEN R-308CK/ R-308CW/ R-310CK/ R-310CW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-308CK, R-308CW, R-310CK, R- OPERATION 310CW. It is recommended that service personnel carefully study the entire... -
Page 6: Product Specifications
R-3 0 8CK R-308CW R -310 CK R-310CW 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"... -
Page 7: Oven Diagram
Entress Vegetables Muffins 1 Ground Meat 1 Ground Meat 2 Steaks/Chops 2 Steaks/Chops COMPU DEFROST 3 Chicken Pieces 3 Chicken Pieces COMPU DEFROST Power Timer Timer Power Level Level Clock Clock Stop Stop START START Clear Clear R-310CK/CW R-308CK/CW... -
Page 8: Operation
R-3 0 8CK R-308CW R -310 CK R-310CW 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 OFF CONDITION primary interlock relay (RY2) and secondary interlock... - Page 9 R -308CK R-308CW R -310CK R -310CW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY THERMAL MONITOR THERMAL CUT-OUT (OVEN) FUSE 20A CUT-OUT (MG.) COM. POWER N.O. TRANSFORMER (RY-2) (RY-1) PRIMARY INTERLOCK RELAY CONTROL UNIT N.O.
- Page 10 R-3 0 8CK R-308CW R -310 CK R-310CW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM open, the monitor fuse blows simultaneously with closing of the monitor switch contacts. The door is opened by pushing the open button on the CAUTION: BEFORE REPLACING A BLOWN MONITOR control panel, refer to the Figure D-1.
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Page 11: Troubleshooting Guide
R -308CK R-308CW R -310CK R -310CW 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 12: Test Procedure
R-3 0 8CK R-308CW R -310 CK R-310CW 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 TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows when power cord is plugged into wall... - Page 13 R -308CK R-308CW R -310CK R -310CW 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.
- Page 14 R-3 0 8CK R-308CW R -310 CK R-310CW 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.
- Page 15 R -308CK R-308CW R -310CK R -310CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. 2.
- Page 16 R-3 0 8CK R-308CW R -310 CK R-310CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). Screw Driver 7. Reconnect the power supply cord after the outer case is installed. Monitor 8.
- Page 17 R -308CK R-308CW R -310CK R -310CW 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 Clear potatoes vegetables meat R-308CK/CW R-310CK/CW RELAY 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. Disconnect the leads to the primary of the power transformer.
- Page 19 R -308CK R-308CW R -310CK R -310CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (6) If improper operation is indicated, the control unit is probably defective and should be checked. 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.
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Page 20: Touch Control Panel
R-3 0 8CK R-308CW R -310 CK R-310CW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit The touch control section consists of the following units. This circuit generates voltages necessary in the control unit from the AC line voltage. (1) Key Unit In addition, the synchronizing signal is available in order to (2) Control Unit (The Control Unit consists of Power Unit and... - Page 21 R -308CK R-308CW R -310CK R -310CW Pin No. Signal Description 11-13 P57-P55 Terminal not used. CNTR0 Signal to sound buzzer (2.0 kHz). 0.1 sec. H : GND A: key touch sound. L : -5V B: Completion sound. 2.0 sec. H : GND L : -5V Oven lamp, fan motor and turntable motor driving signal...
- Page 22 R-3 0 8CK R-308CW R -310 CK R-310CW Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45 terminal while one of G8 line keys on key matrix is touched. Key strobe signal.
- Page 23 R -308CK R-308CW R -310CK R -310CW TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components repair all the controls (sensor-related ones included) of the touch control panel while keeping it connected to the This unit uses CMOS LSI in the integral part of the oven.
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Page 24: 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 25 R -308CK R-308CW R -310CK R -310CW 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 26 R-3 0 8CK R-308CW R -310 CK R-310CW 5. Remove the four (4) screws holding chassis support to cavity front plate and the back plate. magnetron, oven cavity back plate, oven cavity front 3. Hold the chassis support to the oven cavity back plate, flange and fan duct.
- Page 27 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 28 R-3 0 8CK R-308CW R -310 CK R-310CW DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Re-install 1. Disconnect the power supply cord and remove outer case. 2. Open the door and block it open. 1. Re-install each switch in its place. The secondary interlock/monitor switches are in the lower position and 3.
- Page 29 R -308CK R-308CW R -310CK R -310CW 11.Now, door panel with sealer film is free. After any service, make sure of the following : 12.Tear sealer film from door panel. 1. Door latch heads smoothly catch latch hook through 13.Now, door panel is free. latch holes and that latch head goes through center of 14.Slide latch head upward and remove it from door frame latch hole.
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Page 30: Pictorial Diagram
R-3 0 8CK R-308CW R -310 CK R-310CW RECTIFIER H.V. -
Page 31: Power Unit Circuit
R -308CK R-308CW R -310CK R -310CW CN-C S1NB10 9PIN LEAD WIRE HARNESS CN-A – OVEN LAMP TURNTABLE BUZZER MOTOR FAN MOTOR OVEN LAMP TURNTABLE MOTOR FAN MOTOR MICRO MICRO (BROWNER) SH-A DOOR SWITCH SH-B DOOR... -
Page 32: Cpu Unit Circuit
R-3 0 8CK R-308CW R -310 CK R-310CW COM1 COM2 COM3 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 VREF XOUT AVSS COM3 COM2 COM1 RESET COM0 4.7k 4.7k 4.7k... - Page 33 R -308CK R-308CW R -310CK R -310CW COM1 COM2 COM3 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 VREF XOUT AVSS COM3 COM2 COM1 RESET COM0 4.7k 4.7k 4.7k /25v...
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Page 34: Printed Wiring Board
R-3 0 8CK R-308CW R -310 CK R-310CW SW (GREEN) CN - C SH - B SH - A CN - B (D3) (D4) TTM FM BROWNER MICRO Figure S-5. Printed Wiring Board of Power Unit... -
Page 35: Parts List
Control panel frame with key unit [R-310CK] 3- 3 FPNLCB416WRK0 Control panel frame with key unit [R-310CW] 3- 3 FPNLCB420WRK0 Control panel frame with key unit [R-308CK] 3- 3 FPNLCB421WRK0 Control panel frame with key unit [R-308CW] 3- 3-1 FUNTKA915WRE0... - Page 36 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.
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Page 37: Oven And Cabinet Parts
R -3 0 8 CK R -308 CW R - 31 0 CK R -310 CW OVEN AND CABINET PARTS 4-13 4-10 1-10 4-17 1-11 4-18 4-12 1-13 4-15 4-14 4-11 1-12 1-14 4-16... - Page 38 R -3 0 8CK R-30 8CW R -3 10 CK R-3 10CW CONTROL PANEL PARTS DOOR PARTS 3-3-1 MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.
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Page 39: Packing And Accessories
SSAKHA034WRE0 6- 8 INSTRUCTION BOOK & PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA396WRK0 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA451WRE0 OVEN CAVITY Not replaceable items. PACKING CASE SPAKCD194WRE0 [R-310CK] SPAKCD197WRE0 [R-310CW] SPAKCD203WRE0 [R-308CK] SPAKCD204WRE0 [R-308CW]... - Page 40 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...