R306LW SERVICE MANUAL S2603R306KPW/ MICROWAVE OVEN MODELS R-306LK R-306LW 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.
CONTENTS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY 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 2. MICROWAVE MEASUREMENT PROCEDURE [1] Requirements: ............................................2-1 [2] Preparation for testing: .....................
R306LW R306LW 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.
R306LW Service Manual CHAPTER 1. WARNING TO SERVICE PERSONNEL R306LW 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.
R306LW Service Manual CHAPTER 2. MICROWAVE MEASUREMENT PROCEDURE R306LW [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.
R306LW CHAPTER 3. FOREWORD AND WARNINGService R306LW Manual [1] FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-306LK and R-306LW. 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.
R306LW CHAPTER 4. PRODUCT DESCRIPTION R306LW Service Manual [1] SPECIFICATIONS ITEM Power Requirements Power Consumption Power Output Outside Dimensions Cooking Cavity Dimensions (1.0 Cubic feet) Control Complement Oven Cavity Light Safety Standard DESCRIPTION 120 Volts 60 Hertz Single phase, 3 wire grounded 1530W / Approx.
R306LW CHAPTER 5. GENERAL INFORMATION R306LW 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.
R306LW 2. TOUCH CONTROL PANEL NOTE: Some one-touch cooking features such as “MINUTE PLUS” are disabled after three minutes when the oven is not in use. These features are automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed.
R306LW CHAPTER 6. OPERATION R306LW Service Manual [1] DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. OFF CONDITION 3. POWER LEVEL P-0 TO P-90 COOKING Closing the door activates door sensing switch and secondary interlock switch. (In this condition, the monitor switch contacts are opened.) When Variable Cooking Power is programmed, the 120 volts A.C.
R306LW [2] OVEN SCHEMATIC 1. Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY TEMPERATURE FUSE 150ºC (OVEN) or THERMAL CUT-OUT 145ºC (OVEN) NOTE: " L TEMPERATURE FUSE 150ºC (MAGNETRON) " indicates components with potentials above 250V FUSE 20A 120V AC 60 Hz (RY-2) (RY-1) A1 PRIMARY INTERLOCK RELAY CAPACITOR 0.91μF AC2100V CONTROL UNIT A3 LINE BYPASS CAPACITOR 0.0033μF / AC 125V GRN NOISE SUPPRESSION COIL LINE CROSS CAPACITOR 0.
R306LW [3] DESCRIPTION AND FUNCTION OF COMPONENTS 1. DOOR OPEN MECHANISM 4. TURNTABLE MOTOR The door is opened by pushing the open button on the control panel, refer to the Figure D-1. The turntable motor rotates the turntable located on the bottom of the oven cavity, so that the food on the turntable is cooked evenly. The turntable may turn in either direction. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head.
R306LW CHAPTER 7. TROUBLESHOOTING GUIDEService R306LW 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.
R306LW CHAPTER 8. TEST PROCEDURES R306LW 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.
R306LW 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.
R306LW 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. The meter should indicate an open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the door sensing switch. 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7.
R306LW If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be replaced with “monitor fuse and monitor switch assembly” part number FFS-BA037WRKZ, even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch. 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.
R306LW 7) Reconnect the power supply cord after the outer case is installed. 8) Run the oven and check all functions. 2. Control Unit. The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure K) to determine if control unit is faulty. 1) In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal.
R306LW [13] Procedure L: 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. 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. 7. Remove the outer case and check voltage between Pin No.
R306LW 5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 915Ω±10%). If any abnormal condition is detected, replace the control unit. 6) Reconnect all leads removed from components during testing. 7) Re-install the outer case (cabinet). 8) Reconnect the power supply cord after the outer case is installed. d 9) Run the oven and check all functions.
R306LW Service Manual CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY R306LW [1] OUTLINE OF TOUCH CONTROL PANEL This circuit consists of 4-digits, 12-segments and 3-common electrodes using a Liquid Crystal Display. The touch control section consists of the following units as shown in the touch control panel circuit. (1) Key Unit 3) Power Source Circuit This circuit generates voltage necessary in the control unit from the AC line voltage.
R306LW Pin No. 25 Signal COM3 I/O OUT 26-37 SEG0-SEG11 OUT 38-40 SEG12-SEG14 OUT 41 P70 OUT Description Terminal not used. Segment data signal. Connected to LCD.The relation between signals are as follows: LSI signal (Pin No.) LCD (segment) LSI signal (Pin No.
R306LW Pin No. Signal I/O Description Signal to sound buzzer (2.0 kHz). A: key touch sound. B: Completion sound. 0.1 sec. H : GND 63 BZO90 A OUT 2.0 sec. L : -5V H : GND B L : -5V 64 P20 OUT Terminal not used. [3] SERVICING FOR TOUCH CONTROL PANEL 1. Precautions for Handling Electronic Components 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.
R306LW Service Manual SOLDER CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE R306LW [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.
R306LW Service AND Manual ADJUSTMENT PROCECHAPTER 11. COMPONENT REPLACEMENT R306LW DURE [1] WARNINGS 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.
R306LW [2] OUTER CASE REMOVAL NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. To remove the outer case, procedure as follows. 1. Disconnect the power supply cord. 2. Open the oven door and block it open. 3. Remove the two (2) screws from the lower portion of the rear cabinet using a T20H Torx type or GTXH20-100 screw driver. 4. Remove the remaining three (3) screws from rear and one (1) screw along the right side of outer case. 5.
R306LW 4. Hold the other end of the chassis support to the magnetron with the one (1) screw. 11.Now, the magnetron is free. 2. REINSTALLATION 5. Reconnect the wire leads to the magnetron. Refer to “PICTORIAL DIAGRAM”. 1. Reinstall the magnetron to waveguide flange with the four (4) screws. 6. Reinstall outer case and check that the oven is operating properly. 2. Reinstall the air duct to the oven cavity top plate and the magnetron with two (2) screws. CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.
R306LW Control panel frame Large depression Control panel frame (Rear side) Liquid crystal display Slit Long slit Small backing paper Contact surface Ribbon cable of membrane switch Ribbon cable Graphic sheet Membrane switch Rubber connector Small depression Figure C-2. Graphic Sheet and Membrane Switch Replacement [9] TURNTABLE MOTOR REMOVAL 5. Disconnect wire leads from turntable motor. 1. Disconnect the power supply cord. (See “Positive lock® connector removal”) 2.
R306LW [11] POWER SUPPLY CORD REPLACEMENT 1. REMOVAL 1. Disconnect the power supply cord, and remove outer case. Power Supply Cord 2. Open the door and block it open. 3. Discharge high voltage capacitor. Screw 4. Remove the single (1) screw holding the green wire to the oven cavity back plate. Oven Cavity Back Plate Gray Wires 7. Now, the power supply cord is free. Noise Filter RED 6.
R306LW 2. After adjustment, check the following. 1. In and out play of door remains less than 0.5mm when in the latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face. Door Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in the door) should be less than 0.5mm. Latch Hook Door Sensing Switch Latch Heads 2.
R306LW 4. SEALER FILM Pin 1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-7 Upper Oven Hinge 2. Tear the backing film by pulling the adhesive tape. Upper Oven Hinge 3. Put the pasted side of the sealer film on the door panel Sealer film Slit choke of door panel Backing film Adhesive tape Lower Oven Hinge Figure C-7. Sealer film Lower Oven Hinge Pin Choke Cover Figure C-6.
PNK RED CN-A 1 3 RY2 PRIMARY INTERLOCK RELAY 2 1 CN-B MONITOR SWITCH T1 Figure S-1. Pictorial Diagram 12 – 1 N.C. COM N.O. COMN.O. WHT GRY BLK WHT WHT COM WHT GRY CN-A 3 RED 2 1 GRY CN-B 2 GRY 1 GRN GRN GRN GRY GRN OVEN LAMP RED PNK TURNTABLE MOTOR GRY GRY BLK RED RED GRY GRY RED TEMPERATURE FUSE (MAGNETRON) RED PNK WHT BLK GRY GRY GRN FUSE Screw WHT Noise Filter RED Oven Cavity Back Plate WHT RED POWER TRANSFORMER (RED) (WHT) HIGH VOLTAGE CAPACITOR H.
Figure S-2. Control Panel Circuit 12 – 2 CN-B B2P-VH-B DOOR SW. POWER TRANSFORMER AC OVEN LAMP TURNTABLE MOTOR FAN MOTOR AC120V 60HZ AC CN-A B2(5.0)B-XA B2 B1 A3 A1 - + - + Q21 DTD143ES D4 < POWER UNIT > RY2 DU12D1-1P(M)-R D20 MC2836 RY1 G5NB-1A12VDC D2 910 1/2W R4 NOTE D40 MC2836 Q22 DTA123JS - + DOOR M COM BZ VR INT -5V GND 10K (J12) 4 C1 R30 T1 PA142DR 470uF/25V 10uF/35V (J10) C20 Q30 DTA143EKA 15K R41 0.
R306LW [3] Printed Wiring Board (Figure S-3) Figure S-3.
R306LW PARTS LIST MICROWAVE OVEN 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 MODELS R-306LK R-306LW Parts marked "*" may cause undue microwave exposure. Parts marked " " are used in voltage more than 250V.
R306LW [1] OVEN PARTS 7-10 7-2 7-10 2-1 7-10 7-1 1-2 1-13 7-2 4-9 4-15 4-12 7-9 7-11 4-3 1-6 4-16 6-4 7-6 1-12 1-3 7-1 4-13 7-8 1-7 7-3 7-3 6-3 7-3 1-8 7-10 7-7 4-4 7-10 4-8 7-8 1-11 4-14 6-2 4-6 4-7 7-4 4-12 4-17 7-5 4-10 1-9 4-12 7-7 4-1 1-1 4-5 1-10 7-1 1-2 6-1 4-11 1-1 7-8 2-2 4-2 7-1 1-5 1-4 7-10 2-3 7-10 2-3 2-3 7-10 7-10 2-3 4-12 2
R306LW NO.
R306LW [2] DOOR AND CONTROL PANEL PARTS 5-7 5-2 5-1 5-3 5-8 5-4 5-8 5-6 5-5 3-7 3-2 3-5 3-1 3-6 3-2-2 6-5 3-4 6-6 3-3 3-2-1 4
R306LW NO.
R306LW INDEX PARTS CODE [ D ] DPWB-A352DRKZ [ F ] FACCDA098WREZ FACCDA099WREZ FACCDA109WREZ FACCDA110WREZ FDORFA364WRTZ FFS-BA037WRKZ FH-DZA075WRK0 FH-DZA109WRKZ FH-DZA112WRKZ FPNLCB897WRKZ FPNLCB898WRKZ FPWBFA385WRKZ FROLPA101WRKZ FW-VZC092WREZ [ G ] GCABUA883WRPZ GCABUA889WRPZ GCOVHA450WRFZ GDAI-A360WRWZ GLEGPA074WRE0 GWAKPB025WRRZ GWAKPB027WRRZ [ H ] HPNL-A861WRRZ HPNL-A863WRRZ [ J ] JBTN-B354WRFZ JBTN-B355WRFZ [ L ] LBNDKA163WRPZ LSTPPA188WRF0 LX-CZ0052WRE0 LX-CZA070WRE0 LX-CZA073WRE0 LX-EZA042WRE0 [
