R-301FK R-301FW SERVICE MANUAL S2203R301FPW/ MICROWAVE OVEN COOK DEF. START CHECK QTY LB OZ SIZE CUPS MODELS R-301FK R-301FW 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 contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock.
R- 301FK R-301FW 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-301FK R-301FW 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- 301FK R-301FW 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-301FK R-301FW SERVICE MANUAL PRODUCT DESCRIPTION MICROWAVE OVEN R-301FK/ R-301FW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS,R-301FK and R-301FW. 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- 301FK R-301FW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 11-7/8" Depth 16-1/2" Cooking Cavity Dimensions Width 14-3/4" Height 8-3/4" Depth 15-3/4" 1.2 Cubic Feet Control Complement Touch Control System Clock ( 1:00 - 12:59 ) Timer (0 - 99 min.
R-301FK R-301FW 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- 301FK R-301FW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. relay and is mechanically associated with the door so that it will function in the following sequence. (1) When the door opens from the closed position, the primary interlock relay (RY2) and secondary interlock switch open their contacts. And contacts of the relay (RY1) remains closed. Then the monitor switch contacts close.
R-301FK R-301FW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY MONITOR FUSE 20A NOTE: " " indicates components with potential above 250V. OVEN THERMAL CUT-OUT MG. THERMAL CUT-OUT POWER TRANSFORMER N.O. PRIMARY INTERLOCK RELAY (RY2) CAPACITOR 0.94µF AC 2200V COM. GRN B2 120V AC 60 Hz B1 MONITOR SWITCH CONTROL UNIT DOOR SENSING SWITCH OL OVEN LAMP RELAY (RY1) N.O.
R- 301FK R-301FW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM (RY2) and secondary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts. 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").
R-301FK R-301FW 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- 301FK R-301FW 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. Display does not operate properly when STOP/CLEAR key is touched. (Buzzer should sound and ":" or time of day should appear in display.) Oven lamp does not light when door is opened.
R-301FK R-301FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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. This test should indicate an infinite resistance. If there is little or no resistance the magnetron is grounded and must be replaced. 6.
R- 301FK R-301FW TEST PROCEDURES PROCEDURE LETTER C COMPONENT TEST 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. 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.
R-301FK R-301FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT. F SECONDARY INTERLOCK SWITCH TEST 1. 2. 3. 4. 5. 6. 7. 8. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch.
R- 301FK R-301FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. Reconnect all leads removed from components during testing. Reinstall the outer case (cabinet). Reconnect the power supply cord after the outer case is installed. Screw Driver Run the oven and check all RED functions. GRY Monitor Switch Secondary Interlock Switch H Ohmmeter BLOWN MONITOR FUSE TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case. Open the door and block it open.
R-301FK R-301FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST If the Key unit is defective. 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) Replace the Key unit. 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. 2.
R- 301FK R-301FW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST G1 MINUTE PLUS G2 G3 G4 G5 G6 G7 START 2 9 TIMER CLOCK 5 1 3 STOP CLEAR 8 4 COOK 6 POWER LEVEL 0 7 REHEAT G8 G9 G10 DEFROST G11 POPCORN G12 G13 G14 K RELAY TEST 1. 2. 3. 4. 5. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Disconnect the leads to the primary of the power transformer.
R-301FK R-301FW TEST PROCEDURES PROCEDURE LETTER M COMPONENT TEST 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. 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) Follow the troubleshooting guide given below for repair.
R- 301FK R-301FW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage. In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit. 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).
R-301FK R-301FW DESCRIPTION OF LSI LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal I/O Description 1 P50 IN Signal coming from touch key. When either G9 line on key matrix is touched, a corresponding signal out of P22 - P26 and P31 - P33 will be input into P50. When no key is touched, the signal is held at “H” level. 2 P51 IN Signal similar to P50. When either G10 line on key matrix is touched, a corresponding signal will be input into P51.
R- 301FK R-301FW Pin No. Signal I/O Description 40 SEG14 OUT Terminal not used. 41 P70 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. H : GND L : -5V During cooking 42 P71 OUT Terminal not used. 43 P72 OUT Magnetron high-voltage circuit driving signal. OFF To turn on and off the cook relay (RY2).
R-301FK R-301FW Pin No. Signal I/O Description 60 P24 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P50, P51, P52 and P53 terminal while one of G6 line keys on key matrix is touched. 61 P23 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P50, P51, P52 and P53 terminal while one of G7 line keys on key matrix is touched. 62 P22 OUT Key strobe signal. Signal applied to touch-key section.
R- 301FK R-301FW TOUCH CONTROL PANEL SERVICING 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. On some models, the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other.
R-301FK R-301FW 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- 301FK R-301FW 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. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. Special screw Screw Driver (Type: TORX T20 H or GTXH20-100) POWER TRANSFORMER REMOVAL 1. Disconnect the power supply cord and then remove outer case. 2. Open the oven door and block it open. 3.
R-301FK R-301FW MAGNETRON REMOVAL Reinstallation 1. Reinstall the magnetron to waveguide flange with the four (4) screws. 2. Insert the two (2) tabs of the chassis support to the oven cavity front plate and the back plate. 3. Hold the chassis support to the oven cavity back plate, oven cavity front flange, magnetron and the fan duct with the five (5) screws. 4. Reconnect the wire leads to the magnetron and thermal cut-out (MG). Refer to "PICTORIAL DIAGRAM" on page 30. 5.
R- 301FK R-301FW 6. Attach the membrane switch to the control panel frame by rubbing with a soft cloth not to scratch. 7. Tear the backing paper from the new graphic sheet. 8. Adjust the upper edge and right edge of the graphic sheet to the large depression on the surface of the control panel frame. 9. Attach the graphic sheet to the control panel frame by rubbing with a soft cloth not to scratch. 10. Tear the small backing paper from the ribbon cable of the membrane switch. 11.
R-301FK R-301FW 2. Install the fan blade to the fan motor shaft according to the following procedure. 3. Hold the center of the bracket which supports the shaft of the fan motor on the flat table. 4. Apply the screw lock tight into the hole (for shaft) of the fan blade. 5. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet. CAUTION: * Do not hit the fan blade strongly when installed because the bracket may be disfigured.
R- 301FK R-301FW 3. Monitor switch contacts close when door is opened. 4. Reinstall outer case and check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.) Door Latch Hook Latch Heads Door Sensing Switch Monitor Switch Switch Lever Secondary Interlock Switch Figure C-3. Latch Switch Adjustments DOOR REPLACEMENT REMOVAL 1. Disconnect the power supply cord. 2. Open the door slightly. 3. Insert a putty knife (thickness of about 0.
R-301FK R-301FW SEALER FILM Pin Upper Oven Hinge Installation 1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-6. 2. Tear the backing film by pulling the adhesive tape. 3. Put the pasted side of the sealer film on the door panel Upper Oven Hinge Slit choke of door panel Sealer film Backing film Adhesive tape Lower Oven Hinge Figure C-6. Sealer film Lower Oven Hinge Pin Choke Cover Figure C-5.
1 H 2 CN-B 3 30 R E D Y L W B L K N.O. 4 GRY WHT 5 GRY BLK WHT Figure S-1. Pictorial Diagram TURNTABLE MOTOR WHT RED WHT WHT C GRY WHT WHT BLK MONITOR FUSE & HOLDER BLK FAN MOTOR BLK NOTE: The neutral (WHT) wire must be connected to the terminal with "N" mark on the power supply cord. POWER TRANSFORMER MAGNETRON HIGH VOLTAGE CAPACITOR HIGH VOLTAGE COMPONENTS BLK THERMAL CUT-OUT (MG) POWER SUPPLY CORD 120V 60Hz N 4 COM.
DOOR SENSING SWITCH MICRO AC(H) 4 CN-B 10G471K VRS1 NOTE : RY2 RY1 (J1) LD3 C2 1000µ/25v R4 560 1/2w D40 SP1 – + C21 10µ/35v : IF NOT SPECIFIED, 1SS270A ZD1 HZ4B3 Q22 DTA123JS C8 220µ/10v : IF NOT SPECIFIED, 1/10W ± 5% – + Q21 DTD143ES LD2 POWER UNIT LD1 – + DOOR M COM BZ BL VR INT -5V C1 0.1µ/25v R30 3.3k C10 0.1µ/25v Q10 DTA143EKA Q30 DTA143EKA R3 4.7k C20 0.
R- 301FK R-301FW 2 1 4 3 6 5 A A B B DIP QPWBFA717DRZZ CHIP SIDE C C D40 D4 ZD1 E D2 C1 D21 E B Q21 SP1 B Q22 C2 D1 S P E F D 2 D20 E D3 C3 1 R1 CN-B D C21 T1 F (J1) D22 VRS1 G G RY2 RY1 H H Figure S-3.
R-301FK R-301FW 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- 301FK R-301FW REF. NO. ∆ ∆ ∆ ∆ PART NO.
R-301FK R-301FW 2 1 4 3 7-6 2-1 OVEN AND CABINET PARTS 6 5 7-8 A A 7-6 4-19 7-10 B 4-17 B 7-8 4-9 1-4 6-7 1-8 4-13 7-7 C C 6-6 4-11 4-7 7-3 1-5 7-6 D D 7-4 4-19 7-1 4-12 1-7 4-11 4-15 1-1 E 7-9 4-14 6-2 1-6 4-4 4-18 4-3 7-1 6-1 4-8 7-6 1-3 1-12 F E 1-13 1-2 4-10 4-2 7-6 7-2 4-5 1-1 7-6 7-3 1-10 F 7-5 7-1 2-2 4-1 4-6 4-16 1-11 1-9 G G 7-1 7-6 7-6 H H 7-6 7-6 2-3 1 2 4 3 35 5 6
R- 301FK R-301FW 2 1 4 3 6 5 Before attaching Control unit to Control panel, foil side of Control unit must be cleaned by ethyl-alcohol. CONTROL PANEL PARTS A A 3-5 3-7 3-8 3-1 B B 3-1-1 3-6 DOOR PARTS 3-4 C C 5-7 3-1-2 5-2 3-3 D D 3-2 5-1 5-3 5-4 E E F F 5-5 5-6 G G MISCELLANEOUS 6-5 6-3 H H Actual wire harness may be different from illustration.
R-301FK R-301FW 1 2 4 3 6 5 A A TOP PAD ASSEMBLY PACKING AND ACCESSORIES FPADBA471WRKZ DOOR PROTECTION SHEET B PLASTIC SHEET (for R-301FK) SPADPA204WRE0 B SPADPA616WREZ PLASTIC BAG SSAKHA034WRE0 FOAM SHEET SPAKHA012WREZ (only for R-301FK) C 6- 4 CABINET COVER SPAKHA011WRE0 (only for R-301FK) INSTRUCTION BOOK & PRINTING MATTER 6- 2 C BOTTOM PAD ASSEMBLY TURNTABLE TRAY FPADBA472WRKZ 6- 1 TURNTABLE SUPPORT D D TRAY PACK INTO THE OVEN CAVITY SPADFA527WREZ Not replaceable items.
R- 301FK R-301FW COPYRIGHT © 2002 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. 2002 SHARP CORP. (2S1.700E) Printed in U.S.
