R21LCF SERVICE MANUAL S7607R21LCFP/ LIGHT DUTY COMMERCIAL MICROWAVE OVEN 1000W/ R-21LC TIME GUIDE FOR ONE 15 - 30 sec. Bagel, Roll Muffin, Pastry Pie Slice 40 50 30 D E 20 C 10 2 - 3 min. Casserole, Stew Chili, Chowder Popcorn, 3.5 oz. 1 F 1.5 G I 2 J A K L M ERCIA N L MICR OW T 6 AVE OV EN O S R R-21LCF H B 0 COMM MODEL SERVING 30 - 60 sec. Hot Dog Pizza Slice Small Sandwich 1 - 2 min. Beverage, Soup Large Sandwich Popcorn, 1.5 oz.
CONTENTS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY [12] Procedure L: RELAY TEST......................... 8-5 [13] Procedure M: FOIL PATTERN ON THE PRINTED WIRING BOARD TEST.............. 8-5 CHAPTER 1. WARNING TO SERVICE PERSONNEL [1] Before Servicing .........................................1-1 [2] When the testing is completed, ..................1-1 [3] After repairing .............................................1-1 CHAPTER 9.
R21LCF R21LCF Service PRECAUTIONS TO BE OBSERVED BEFORE AND Manual DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY 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.
R21LCF Service Manual CHAPTER 1. WARNING TO SERVICE PERSONNEL R21LCF 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.
R21LCF Service Manual CHAPTER 2. MICROWAVE MEASUREMENT PROCEDURE R21LCF [1] 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. 2.
R21LCF CHAPTER 3. FOREWORD AND WARNINGService R21LCF Manual [1] FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-21LCF. 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.
R21LCF CHAPTER 4.
R21LCF CHAPTER 5. GENERAL INFORMATION R21LCF Service Manual [1] GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.
R21LCF CHAPTER 6. OPERATION R21LCF Service Manual [1] DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. OFF CONDITION 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. Closing the door activates door sensing switch and secondary interlock switch.
R21LCF 2. Cooking Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. LIGHT UP DIAL ON. THERMAL CUT-OUT 145ºC (MAG.) THERMAL CUT-OUT 125ºC (OVEN) FUSE 20A L NOISE FILTER POWER TRANSFORMER MONITOR SWITCH A1 OL DOOR SENSING SWITCH OVEN LAMP FM FAN MOTOR RECTIFIER LINE BYPASS CAPACITOR 0.0033μF / AC 250V A3 CAPACITOR 1.00 μF 2300V MAGNETRON RY2 COOK RELAY RY1 PRIMARY INTERLOCK RELAY LINE BYPASS CAPACITOR 0.
R21LCF 3) If the door is opened, and the primary interlock relay (RY1) 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 (RY1), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROC NOTE: MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY. 4.
R21LCF CHAPTER 7. TROUBLESHOOTING GUIDEService R21LCF Manual 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.
R21LCF CHAPTER 8. TEST PROCEDURES R21LCF Service Manual [1] Procedure A: 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. 5.
R21LCF 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. NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts. [4] Procedure D: HIGH VOLTAGE CAPACITOR 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.
R21LCF 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. [7] Procedure F: PRIMARY INTERLOCK SYSTEM TEST 1. DOOR SENSING SWITCH 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 switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch.
R21LCF 3. Discharge high voltage capacitor. 4. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
R21LCF When testing is completed, 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) Reconnect all leads removed from components during testing. 5) Re-install the outer case (cabinet). 6) Reconnect the power supply cord after the outer case is installed. 7) Run the oven and check all functions. [12] Procedure L: RELAY TEST 1. Disconnect the power supply cord, and then remove outer case. 2.
R21LCF 2. Follow the troubleshooting guide given below, if indicator does not light up after above check and repairs are finished. 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. 5) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape. 6) After that procedure, re-connect the power supply cord.
R21LCF Service Manual CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY R21LCF [1] OUTLINE OF TOUCH CONTROL PANEL 1. Control Unit 4) Reset Circuit A circuit to generate a signals which resets the LSI to the initial state when power is supplied. Control unit consists of LSI, power source circuit, synchronizing signal circuit, reset circuit, buzzer circuit, encoder circuit and indicator circuit. 5) Buzzer Circuit 1) LSI The buzzer is responsive to signals from the LSI to emit audible sounds (completion sound).
R21LCF 4. Other Precautions Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel; it is also possible to check the sensor-related controls of the touch control panel by using the dummy resistor(s). 1) Before turning on the power source of the control unit, remove the aluminium foil applied for preventing static electricity.
R21LCF Service Manual SOLDER CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE R21LCF [1] Employing lead-free solder The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder. Example: Indicates lead-free solder of tin, silver and copper [2] Using lead-free wire solder When repairing a PWB with the "LF" symbol, only lead-free solder should be used.
R21LCF Service AND Manual ADJUSTMENT PROCECHAPTER 11. COMPONENT REPLACEMENT R21LCF DURE [1] WARNING 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.
R21LCF 6. Disconnect the main wire harness from the power transformer. 8. Remove the transformer. 7. Remove the two (2) screws and two (2) VCP caps holding the transformer to base plate. 9. Now the power transformer is free. [4] HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL To remove the components, proceed as follows. 8. Now, the high voltage rectifier assembly should be free. 1. Disconnect the power supply cord and remove outer case. 9.
R21LCF Figure C-1. Oven lamp socket [8] POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL 1. Disconnect the power supply cord, and remove outer case. 2. Open the door and block it open. Terminal 3. Discharge high voltage capacitor. 4. Push the lever of positive lock® connector. Positive lock connector 5. Pull down on the positive lock® connector. R 1 CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNECTORS TO THE TERMINALS, NSTALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU.
R21LCF Coil Shaft Groove joint pliers Shaft Axis Stator Gap Bracket These are the positions that should be pinched with pliers. Stator Rotor Rear View Table Center of bracket Rotor Side View [11] POWER SUPPLY CORD REPLACEMENT 1. REMOVAL Oven Cavity Rear Plate 1. Disconnect the power supply cord and then remove outer case. 2. Open the door and block it open. Power Supply Cord Screw 3. Discharge high voltage capacitor. Green Wire 4.
R21LCF 2. REINSTALL 2. Re-connect wire leads to each switch. Refer to pictorial diagram. 1. Re-install each switch in its place. The door sensing switch and monitor switch are in the lower position and the secondary interlock switch is in the upper position. 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. Refer to chapter "Test Procedure" and Adjustment procedure.
R21LCF DOOR HANDLE REMOVAL 1) Make sure that door sensing switch, secondary interlock switch and monitor switch are operating properly. (Refer to chapter “Test Procedures”.). 13.Release the latch spring from the tab of the latch angle assembly. 14.Remove the two (2) screws holding the door handle and the latch angle assembly through the door frame. 2) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards.
R21LCF 5. Install the antenna holder to the oven cavity bottom plate with the one (1) screw and the one (1) washer. Refer to Figure C-8. Screw Washer Antenna holder 6. Install the antenna motor to the oven cavity bottom plate with one (1) screw. Refer to Figure C-8. Square hole 7. Connect the wire leads to the antenna motor, referring to the pictorial diagram. Stirrer antenna Tab 8. Install the base plate cover to the base plate with one (1) screw. Antenna motor shaft 9.
R21LCF 6. Push down the rear edge of the ceramic shelf into the oven cavity bottom plate. 7. Now, the ceramic shelf is installed. WARNING: Make sure that the rubber packing is not caught between the oven door and the oven cavity front plate, to avoid possible exposure to excessive microwave energy.
R Y2 R Y1 OR G RED P R IMAR Y INT E R LOC K R E LAY 5 B LU 4 3 Y LW 2 1 P NK OR G C N-A RED B LU OR G Figure S-1. Pictorial Diagram 12 – 1 OR G N.C . WHT WHT C OM MONMIT OR S WIT C H B LU WHT WHT WHT C OM. Y LW P NK N.O. RED OR G ANT E NNA MOT OR WHT GR Y OR G C ONNE C T OR NOT E : Hot (OR G ) wire mus t be connected to the terminal with blue mark on the oven light s ocket.
1 2 B 2W 100 C R60 SW1 A R63 4.7K R62 4.7K C60 C61 100K 9 3 R12 1/2W 100K D84 ( D83 LD5 (2M) LD10 (5M) LD15 (10M) LD20 (15M) D73 D77 D81 ( . D72 D76 D80 LD3 (1M) . LD8 ) ( LD13 (8M) . LD18 ) D71 D75 D79 LD2 (40 S) LD7 (3M) LD12 (7M) LD17 ( ) . + LD1 -- LD20 LTL-1CHE-011A x 20 LD4 ) LD9 (4M) LD14 (9M) . LD19 ) ( 8 0 11 12 D85 + 1 13 D2 4.7K D1 D70 D74 D78 D82 LD1 (2 0S) . LD6 ( ) LD11 (6M) . LD16 ( ) 6.2K D4 J3 J2 4.
R21LCF [3] Printed Wiring Board (Figure S-3) D80 D76 J P 39 J P 36 D72 L D9 J P 34 J P 35 L D2 J P 37 L D7 L D8 D71 L D3 J P 38 L D6 L D5 L D4 D79 L D10 D75 SW1 J P 33 L D1 L D11 D78 D74 B J P 30 D70 J P 31 J P 32 D81 D77 D73 A J P 29 L D12 L D13 C D83 J P 28 D84 J P 27 D85 L D14 J P 26 J P 25 D82 L D15 L D20 J P 23 J P 24 L D16 L D17 L D18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 L D19 J P 22 J P 20 J P 19 1 32 8 J P 14 C NC ZD6 J P 16 J P 17 J P 15
R21LCF PARTS LIST HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION LIGHT DUTY COMMERCIAL MICROWAVE OVEN MODEL R-21LCF Parts marked "*" may cause undue microwave exposure. Parts marked " " are used in voltage more than 250V.
R21LCF [1] OVEN PARTS 7-3 7-3 2-1 7-3 1-10 1-9 4-28 7-13 7-3 6-6 4-9 4-10 7-13 6-1 4-25 7-6 7-14 4-32 1-4 6-5 1-13 4-26 4-34 7-13 7-1 4-26 6-3 4-24 1-4 1-1 6-4 4-27 4-14 7-1 7-7 4-19 1-8 4-15 4-36 4-16 4-2 7-9 4-40 7-10 7-11 7-12 1-12 4-23 4-21 4-21 4-24 4-20 4-22 4-18 7-8 7-7 4-21 4-20 1-7 4-33 6-2 7-2 4-13 7-4 7-7 7-4 4-29 1-11 7-1 4-31 1-15 7-7 4-6 7-7 1-6 4-3 4-8 4-30 1-3 4-12 1-1 2-2 4-1 4-7 4-38 4-4 4-20 1-2 4-11 4-6 4-37 1-5 4-5 7-5 4
R21LCF NO.
R21LCF NO.
R21LCF [2] DOOR AND CONTROL PANEL PARTS 3-5 3-1 3-2 3-5 3-2-1 3-2-2 3-6 3-3 3-4 5-2 5-1-15 5-1-16 5-1-14 5-1 5-1-2 5-1-12 5-1-16 5-1-18 5-1-4-2 5-1-4-4 5-1-16 5-1-13 5-1-4-5 x4 5-1-4 5-1-1 5-1-4-1 5-1-4-3 5-1-4-5 x2 5-4 5-1-16 5-1-12 5-1-8 5-1-7 5-1-17 5-1-9 5-1-11 5-3 5-1-3 5-1-8 5-1-5 5-1-17 5-1-6 6-8 5-1-10 6-7 Actual wire harness may be different from illustration.
R21LCF NO.
R21LCF INDEX PARTS CODE [ C ] CDORFB052WRKZ [ D ] DPWB-A416DRKZ [ F ] FACCDA116WREZ FANGKA206WRY0 FCOV-A012WRKZ FDORFA322WRT0 FDUC-A341WRY0 FFS-BA033WRKZ FGLSPA062WRE0 FH-DZA119WRKZ FPLT-A007WRY0 FPNLCB911WRKZ FPWBFA389WRKZ FPWBFA417WRKZ FW-VZC073WREZ [ G ] GCABUA674WRP0 GCOVAA260WRP0 GCOVHA406WRW0 GCOVHA407WRF0 GCOVHA509WREZ GDAI-A311WRW0 GLEGPA074WRE0 GLEGPA076WRF0 GWAKPA580WRM0 [ H ] HBDGCA123WREZ HPNLTA200WREZ [ J ] JHNDMA040WRW0 JKNBKA606WRM0 [ L ] LANGFA199WRWZ LANGKA874WRW0 LBNDKA136WRP0 LHLDWA013W
COPYRIGHT © 2006 BY SHARP CORPORATION ALL RIGHTS RESERVED. COPYRIGHT © XXXX BYSHARP CORPORATION No part of this publication may be reproduced, stored in retrieval transmitted in anyform or by ALLsystems, RIGHTSorRESERVED. any means, electronic, mechanical, photocopying, recording, or other wise, without prior written permission of the No partpublisher.
