R - 340DK R -340DW SERVICE MANUAL S2008R340DPW/ MICROWAVE OVEN MODELS R-340DK R-340DW 12 : 30 PM 1 2 4 5 7 8 9 0 Kitchen Timer Minute PLus + 3 6 TOUCH .
R -340DK R-340DW PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open.
R -340DK R-340DW WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing 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 Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage When the testing is completed, 1.
R- 340DK R-340DW 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/cm2 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/cm2 at any point 5cm or more from the external surface of the oven.
R -340DK R-340DW SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE OVEN R-340DK/ R-340DW 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-340DK, R-340DW. It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service. Check the interlock switches and the door seal carefully.
R- 340DK R-340DW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1150 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Width 20-1/2" Height 11-7/8" Depth 17-1/8" Width 14-3/4" Height 8-3/4" Depth 15-3/4" Case Dimensions Cooking Cavity Dimensions 1.2 Cubic Feet Control Complement Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min.
R -340DK R-340DW contact a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized. If the extension cord must be used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally.
R- 340DK R-340DW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. box, and then into the cavity where the food is placed to be cooked. 5. Upon completion of the cooking time, the power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition. 6.
R -340DK R-340DW Note: The ON/OFF time ratio does not correspond with the percentage of microwave power, because approx. 2 seconds are needed for heating of the magnetron filament. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor. NOTE: During this first stage, do not open the door or touch STOP/CLEAR pad. 4. When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero.
R- 340DK R-340DW SCHEMATIC NOTE: CONDITION OF OVEN. 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. MONITOR FUSE 20A NOTE: THERMAL CUT-OUT (OVEN) Indicates components with potential above 250 V. THERMAL CUT-OUT (MG.) N.O. POWER TRANSFORMER N.O. F3 A2 CAPACITOR 0.94µF AC 2300V F2 F1 PRIMARY INTERLOCK RELAY AH SENSOR (RY-2) (RY-1) A1 CONTROL UNIT COM. COM.
R -340DK R-340DW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), RELAY (RY1), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE"). NOTE: MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY. The door is opened by pulling the door. Refer to the Figure D-1.
R- 340DK R-340DW 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. These tests are given a procedure letter which will be found in the "Test Procedure "section.
R -340DK R-340DW CK = Check / RE = Replace Home fuse or circuit breaker blows when power cord is plugged into wall receptacle Monitor fuse blows when power cord is plugged into wall receptacle. OFF CONDITION All letters and indicators do not appear in display when power cord is first plugged into wall outlet. Touch screen does not operate properly when STOP/CLEAR key is touched. (Buzzer should sound and Home page should appear in display.) Oven lamp does not light when door is opened.
R- 340DK R-340DW TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST 1. 2. 3. 4. 5. 6. 7. 8. 9. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. 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.
R -340DK R-340DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 8. Run the oven and check all functions. (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) C HIGH VOLTAGE RECTIFIER TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Isolate the rectifier from the circuit.
R- 340DK R-340DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the cooling fan air guide. 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. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT.
R -340DK R-340DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity 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.
R- 340DK R-340DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 3) Re-install the outer case (cabinet). 4) Reconnect the power supply cord after the outer case is installed. 5) 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. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal. If the Key unit is defective.
R -340DK R-340DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. unit and make sure the door sensing switch is closed (either close the door or short the door sensing switch connector). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the G1 G2 G3 G14 STOP/CLEAR pad making momentary contact.
R- 340DK R-340DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST WEIGHT 0.5lb 1ST STAGE LEVEL TIME 70% 40sec. 2ND STAGE LEVEL TIME 40% 30sec. (5) If improper operation is indicated, the control unit is probably defective and should be checked. M 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. 1. Foil pattern check and repairs.
R -340DK R-340DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 12) Re-install the outer case (cabinet). 13) Reconnect the power supply cord after the outer case is installed. 14) Run the oven and check all functions. N 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. (2) Room temperature should not exceed 95˚F (35˚C).
R- 340DK R-340DW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 9-6. The display will start to count down the remaining cooking time, and the oven will turn off automatically after the water is boiling (bubbling). If new sensor does not operate properly, the problem is with the control unit, and refer to explanation below. CHECKING CONTROL UNIT (1) (2) (3) (4) (5) (6) (7) Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor.
R -340DK R-340DW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 7) Indicator Circuit This circuit consists of 100 x 160 dots using a Liquid Crystal Display. The Liquid Crystal Display (LCD) is drived by IC5. The touch control section consists of the following units. (1) Key Unit (2) Control Unit (The Control Unit consists of Power Unit and CPU Unit). 8) Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage.
R- 340DK R-340DW LSI(IXA029DR) The I/O signal of the LSI(IXA029DR) is detailed in the following table. Pin No. Signal I/O Description 1 TIOCA2 OUT Terminal not used. 2 A20 OUT Terminal not used. 3 Vcc IN 4 TMO0 OUT 5 PB1 IN Signal coming from touch key. When either G11 line on key matrix is touched, a corresponding signal out of P93, P94, P95, P40, P41, P42, P43 and P44 will be input into PB1. When no key is touched, the signal is held at "H" level. 6 PB2 IN Signal similar to PB1.
R -340DK R-340DW Pin No. Signal I/O Description 25 P44 OUT Key strobe signal. Signal applied to touch screen section. A pulse signal is input to PB1-PB5 terminal while one of G10 line keys on key matrix is touched. 26 P45 OUT Oven lamp, fan motor and turntable motor driving signal 16.7 msec. To turn on and off shut off relay (RY1). The square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit.
R- 340DK R-340DW Pin No. Signal I/O Description 74 LWR OUT Terminal not used. 75-76 MD0-MD1 IN Connected to VCC. 77 MD2 IN Connected to GND. 78 Avcc IN A/D converter power source voltage : +5V. The power source voltage to drive the A/D converter. Connected to VCC. 79 Vref IN 80 AN0 IN A/D converter power source voltage : +5V. The power source voltage to drive the A/D converter. Connected to VCC. Terminal to judge whether the model has the sensor cooking function or not.
R -340DK R-340DW ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow. resistance balance of the bridge circuit is deviated to increase the voltage available at AN6 terminal of the LSI.
R- 340DK R-340DW TOUCH CONTROL PANEL SERVICING 4) Re-install the outer case (cabinet). 5) Re-connect the power supply cord after the outer case is installed. 6) Run the oven and check all functions. A. On some models, the power supply cord between the touch control panel and the oven itself is so short that the two can’t be separated. For those models, check and repair all the controls (sensor-related ones included) of the touch control panel while keeping it connected to the oven. B.
R -340DK R-340DW COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1.
R- 340DK R-340DW NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. POWER TRANSFORMER REMOVAL 1. Disconnect the power supply cord and then remove outer case. 2. Open the oven door and block it open. 3. Discharge high voltage capacitor. 4.
R -340DK R-340DW to waveguide flange. 9. Lift up magnetron with care so that magnetron antenna is not hit by any metal object around antenna. 10.Remove the two (2) screws holding the magnetron duct to magnetron. 11.Remove the magnetron duct with thermal cut-out (MG) from magnetron. 12.Now, the magnetron is free. Re-install 1. Re-install the magnetron duct with thermal cut-out (MG) to magnetron with the two (2) screws. 2. Re-install the magnetron to waveguide flange with the four (4) screws. 3.
R- 340DK R-340DW TURNTABLE MOTOR REMOVAL 1. Disconnect the power supply cord. 2. Remove turntable and turntable support from oven cavity. 3. Lay the oven on it's backside. Remove the turntable motor cover by snipping off the material in four corners. 4. Where the corners have been snipped off bend corner areas flat. No sharp edges must be evident after removal of the turntable motor cover. 5. Disconnect wire leads from turntable motor. (See "Positive lock connector removal") 6.
R -340DK R-340DW DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Re-install 1. Re-install each switch in its place. The secondary interlock/monitor switches are in the lower position and the door sensing switch is in the upper position. 2. Re-connect wire leads to each switch. Refer to pictorial diagram. 3. Secure latch hook (with two (2) mounting screws) to oven flange. 4. Make sure that the monitor switch is operating properly and check continuity of the monitor circuit.
R- 340DK R-340DW 11.Now, door panel with sealer film is free. 12.Tear sealer film from door panel. 13.Now, door panel is free. 14.Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head. 15.Now, latch head and latch spring are free. 16.Remove door screen from door frame. 17.Now, door screen is free. Pin Upper Oven Hinge RE-INSTALL 1. Re-install door screen to door frame. 2. Re-install the latch spring to the latch head.
1 2 H 3 33 4 BLK (POWER UNIT) 1 2 CN-A RY2 PRIMARY INTERLOCK RELAY RED RED 5 COM. BLK MONITOR FUSE & HOLDER BLK TURNTABLE MOTOR WHT BLK WHT GRY BLK BLK RED GRY GRY BLK NOTE: The neutral (WHT) wire must be connected to the neutral (WHT) wire of the power supply cord. POWER SUPPLY CORD 120V 60Hz POWER TRANSFORMER HIGH VOLTAGE WIRE B MAGNETRON HIGH VOLTAGE CAPACITOR HIGH VOLTAGE COMPONENTS BLK THERMAL CUT-OUT (MG) WHT N 5 Figure S-1.
R- 340DK R-340DW 2 1 4 3 6 5 A A B R2 91 1w A2 VR C6 VA C4 GND C11 BZ/EN C10 BUZZR C9 OVEN LAMP FAN MOTOR TURNTABLE MOTOR B b AC120V 60Hz – R1 ZD1 HZ-16-1 a 2.4k 1/4w + D1 S1NB10 C2 1000µ/35v VRS1 10G471K Q1 2SD1859 D1 d C GND (J1) C R3 91 1w INT C5 T1 A1 CN-A C1 AC C3 c SP30 D D OVEN LAMP FAN MOTOR TURNTABLE MOTOR RY1 NO COM AC RY2 E E NO MICRO COM C7 MICRO C8 N.C C2 N.
4 F3 F2 F1 C3 5 DOOR SENSING SWITCH NC NC MICROR C1 C2 C8 C7 C9 C10 CN-C OVEN LAMP TURNTABLE MOTOR FAN MOTOR BUZZER BUZZER ENV. C11 AH SENSOR INT C4 C10 10µ/35v C44 0.1µ/50v D21 MA152WK + – C45 0.1µ/50v C30 10µ/35v R30 3.3k C17 0.1µ/50v R40 330 1w R41 3.32kD D20 MA152WK Q22 KRC101S Q20 KRA102S Q32 KRC101S Q31 KRC101S Q30 KRA101S – + 3 IC3 1 4 R46 47k R52 37.4kF R51 75kF R50 150kF R49 300k R48 620k R47 47k C41 0.015µ /25v 8 2 C40 0.1µ/50v ZD10 UDZ5.
R- 340DK R-340DW 2 1 4 3 6 5 A A VH CN - B B B 1 SP30 C SH-B E 1 2 SH-A (GREEN) CN - C Q1 B R3 11 ZD1 R1 R2 C DU OM D22 DIP C2 C1 D1 RY3 D D20 D OM DU OM 1 7 D21 DU RY2 E 5 T1 3 XA F S P RY1 E F 2 1 VRS1 2 (J1) 1 VH CN - A QKITPB031MREO G G H H Figure S-5.
R - 340DK R -340DW 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.
R -3 40DK R-340DW REF. NO. 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23 4-24 4-25 PART NO.
R - 340DK R -340DW 2 1 4 3 7-5 2-1 OVEN AND CABINET PARTS 6 5 7-8 A A 7-5 4-23 4-25 7-1 4-22 1-15 7-2 1-10 4-17 B 7-8 7-2 1-11 1-13 1-4 4-20 1-8 7-3 7-6 7-6 6-7 7-7 7-3 4-13 4-24 4-23 B 6-6 4-9 4-11 C C 7-6 7-3 4-19 4-7 4-10 7-3 6-9 1-5 D D 7-3 7-4 4-20 4-22 7-1 4-12 1-7 4-21 1-6 4-15 E 7-6 E 1-1 7-9 4-14 6-2 4-4 4-2 4-18 1-12 1-2 7-6 1-3 4-8 4-5 F 7-1 6-1 1-14 4-3 7-3 7-6 1-1 F 7-5 7-1 4-16 4-1 2-2 4-15 4-6 2-4 G 1-9 G 7-6 2-3 7
R -3 40DK R-340DW 2 1 4 3 CONTROL PANEL PARTS 3-4 3-2 A 6 5 A 3-3 3-4 B B 3-4 3-3-1 3-1 5-9 C C 5-7 5-2 5-7 D D 5-1 DOOR PARTS 5-7 E E 5-3 5-7 5-5 F F 5-4 5-6 5-8 G G MISCELLANEOUS 6-3 (CAPACITOR) 6-4 H H 6-5 Actual wire harness may be different from illustration.
R - 340DK R -340DW 2 1 4 3 6 5 PACKING AND ACCESSORIES A A TOP PAD ASSEMBLY FPADBA416WRKZ DOOR PROTECTION SHEET SPADPA204WRE0 B B PLASTIC BAG SSAKHA034WRE0 6- 8 INSTRUCTION BOOK & PRINTING MATTER 6- 2 TURNTABLE TRAY C C BOTTOM PAD ASSEMBLY FPADBA417WRKZ 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE OVEN CAVITY SPADFA451WRE0 D D Not replaceable items.
R -3 40DK R-340DW COPYRIGHT © 2000 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. 2000 SHARP CORP. (1S2.530E) Printed in U.S.
