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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 ................................................................................................................................. 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
ON
DEF. LBS.
QTY. CHECK
To adjust quantity-touch pad again
Popcorn
Beverage
Dinner
Fresh
Plate
Casserole
Baked
Fresh
Potato
Vergeta ble
Fresh
Frozen
Roll/Mu ffin
Roll/Mu ffin
1 Ground meat
2 Steaks/c hops
COMPU
3 Chicken pieces
DEFROS T
1
2
3
4
5
6
7
8
9
POWE R
O
TIMER
LEVEL
CLOCK
STOP
START
CLEAR
In the interest of user-safety the oven should be restored to its original
MINUTE PLUS
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-305BW
R-309BW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-305BW
R-309BW
S1801R305BPW/
Page
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Summary of Contents for Sharp R-305BW
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Page 1: Table Of Contents
R-305BW R-309BW SERVICE MANUAL S1801R305BPW/ MICROWAVE OVEN R-305BW MODELS DEF. LBS. QTY. CHECK To adjust quantity-touch pad again R-309BW Popcorn Beverage Dinner Fresh Plate Casserole Baked Fresh Potato Vergeta ble Fresh Frozen Roll/Mu ffin Roll/Mu ffin 1 Ground meat 2 Steaks/c hops... -
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-305BW R-309BW 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-305BW R-309BW 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: Foreword And Warning
MICROWAVE OVEN R-305BW/ R-309BW 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-305BW, R-309BW. It is recommended that service personnel carefully study the entire... -
Page 6: Product Specifications
R-305BW R-309BW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 12 Amperes for R-305BW, 13 Amperes for R-309BW 60 Hertz Single phase, 3 wire grounded Power Output 900 watts[R-305BW] / 1000 watts[R-309BW] (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2"... - Page 7 R-305BW R-309BW 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...
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Page 8: Operation
R-305BW R-309BW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during that it will function in the following sequence. oven operation. (1) When the door opens from the closed position, the primary interlock relay (RY2) and secondary interlock OFF CONDITION switch open their contacts. - Page 9 R-309BW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED CLOCK APPEARS ON DISPLAY THERMAL MONITOR THERMAL CUT-OUT (OVEN) FUSE CUT-OUT (MG.) 20A for R-309BW 15A for R-305BW COM. POWER N.O. TRANSFORMER (RY-1) (RY-2) PRIMARY INTERLOCK RELAY CONTROL UNIT N.O. COM.
- Page 10 R-305BW R-309BW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM (RY2) and secondary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing The door is opened by pushing the open button on the of the monitor switch contacts.
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Page 11: Troubleshooting Guide
If monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS- BA010WRK0 for R-305BW / FFS-BA012WRK0 for R-309BW as an assembly. IMPORTANT: Wherever troubleshooting is performed with the power supply cord disconnected. It may in, some cases, be necessary to connect the power supply cord after the outer case has been removed, in this event, 1. -
Page 12: Test Procedure
R-305BW R-309BW CK = Check / RE = Replace RE RE A B C D E F F G H RE RE CK I CKCK CK K J L M TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows when power cord is plugged... - Page 13 4. Subtract the cold water temperature from the hot water temperature. The normal result should be 22 to 43˚F(12.2 to 23.9˚C) for R-305BW / 34.7 to 64.6˚F(19.3 to 35.9˚C) for R-309BW rise in temperature. If the water temperatures are accurately measured and tested for the required time period the test...
- Page 14 R-305BW R-309BW 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-305BW R-309BW 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. Open the door and block it open.
- Page 16 "monitor fuse and monitor switch assembly" part number FFS-BA010WRK0 for R- 305BW / FFS-BA012WRK0 for R-309BW, even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 15 ampere for R-305BW / 20 ampere for R- 309BW fuse and switch.
- Page 17 R-305BW R-309BW 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 function. The following symptoms indicate a defective key unit.
- Page 18 R-305BW R-309BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault. 5. Reconnect all leads removed from components during testing.
- Page 19 R-305BW R-309BW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (5) 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-305BW R-309BW 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 21 R-305BW R-309BW DESCRIPTION OF LSI LSI(IZA828DR) AND LSI(IZA758DR) The I/O signals of the LSI(IZA828DR and IZA758DR) are detailed in the following table. Pin No. Signal Description 1-12 Segment data signal. SEG0-SEG11 Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.)
- Page 22 R-305BW R-309BW Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G7 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G6 line keys on key matrix is touched.
- Page 23 R-305BW R-309BW TOUCH CONTROL PANEL SERVICING transformer. 4) Re-install the outer case (cabinet). 1. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. 5) Re-connect the power supply cord after the outer case When handling these parts, the following precautions should is installed.
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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-305BW R-309BW 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 26 R-305BW R-309BW 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 28. 2. Open the door and block it open. 5. Re-install outer case and check that the oven is operating 3.
- 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-305BW R-309BW 7. Install the fan duct assembly to the oven cavity with the 9. Install the magnetron and the chassis support to the one (1) screw. oven cavity, referring to "Re-install of MAGNETRON 8. Insert the snap of the main wire harness to the hole of the REMOVAL".
- Page 29 R-305BW R-309BW DOOR REPLACEMENT REMOVAL After any service, make sure of the following : 1. Disconnect the power supply cord. 1. Door latch heads smoothly catch latch hook through 2. Push the open button and open the door slightly. latch holes and that latch head goes through center of 3.
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Page 30: Pictorial Diagram
R-305BW R-309BW... -
Page 31: Power Unit Circuit
R-305BW R-309BW LD1 LD2 LD3 LD4 LD5 LD1-LD5 WH-1 R4 27 Q2 2SB1238 D1-D4 11ES1 R5 4.7k – – 820 1/2w 820 1/2w N.O. TURNTABLE R6 3.3k MOTOR OVEN LAMP MOTOR N.O. MICRO Q3 DTD143ES SH-B DOOR SWITCH 10µ/35v –... -
Page 32: Cpu Unit Circuit
R-305BW R-309BW... - Page 33 R-305BW R-309BW...
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Page 34: Printed Wiring Board
R-305BW R-309BW WH - 1 (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-5. Printed Wiring Board of Power Unit... -
Page 35: Parts List
QSW-MA110WRE0 2nd interlock switch / door sensing switch 1- 2 QFSHDA009WRE0 Fuse holder 1- 3 FFS-BA010WRK0 Monitor fuse and monitor switch assembly [R-305BW] 1- 3 FFS-BA012WRK0 Monitor fuse and monitor switch assembly [R-309BW] 1- 4 RTHM-A078WRE0 Thermal cut-out 125 deg. - 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 required return should be returned as indicated in the Service Policy.
- Page 37 R-305AK OVEN AND CABINET PARTS 1-11 1-10 4-10 1-13 4-17 4-16 6-10 4-15 4-12 4-14 1-12 4-11 4-19 1-14 4-13...
- Page 38 R-305AK CONTROL PANEL PARTS 3-1F 3-3-1 DOOR PARTS 4-18 5-10 MISCELLANEOUS (HIGH VOLTAGE TRANSFORMER) (CAPACITOR) Actual wire harness may be different from illustration.
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Page 39: Packing And Accessories
SPADPA204WRE0 SPAKHA003WRE0 PLASTIC BAG SSAKHA034WRE0 6- 8 INSTRUCTION BOOK & PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA342WRK0 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA397WRE0 OVEN CAVITY Not replaceable items. PACKING CASE SPAKCD008WRE0 [R-305BW] SPAKCD009WRE0 [R-309BW]... - Page 40 No part of this publication may be repro- duced, stored in a 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. (1S2.530E) Printed in U.S.A...