R305KS SERVICE MANUAL No. S4504R305KPST MICROWAVE OVEN MODEL R-305KS 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 BEFORE SERVICING 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: ....
R305KS Service PRECAUTIONS TO BE OBSERVED BEFORE AND Manual DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY R305KS 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.
R305KS Service Manual CHAPTER 1. WARNING TO SERVICE PERSONNEL R305KS 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.
R305KS Service Manual CHAPTER 2. MICROWAVE MEASUREMENT PROCEDURE R305KS [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.
R305KS CHAPTER 3. FOREWORD AND WARNINGService R305KS 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-305KS. 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.
R305KS R305KS CHAPTER 4. PRODUCT DESCRIPTION Service Manual [1] SPECIFICATIONS ITEM Power Requirements Power Consumption Power Output Case 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.
R305KS Service Manual R305KS CHAPTER 5. GENERAL INFORMATION [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.
R305KS 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.
R305KS Service Manual R305KS CHAPTER 6. OPERATION [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.
R305KS [2] OVEN SCHENATIC 1. Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY (MAGNETRON) (OVEN) OR NOTE: " OR " indicates components with potentials above 250V. (MAGNETRON) L POWER TRANSFORMER N.O. LINE BYPASS CAPACITOR 0.0033µF / AC 125V PRIMARY INTERLOCK RELAY (RY2) CAPACITOR 0.19µF AC 2100V B2 B1 MONITOR SWITCH COM. MAGNETRON CONTROL UNIT LINE BYPASS CAPACITOR 0.
R305KS [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.
R305KS CHAPTER 7. TROUBLESHOOTING GUIDEService R305KS 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.
R305KS Service Manual R305KS CHAPTER 8. TEST PROCEDURES [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.
R305KS 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.
R305KS 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.
R305KS CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. 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.
R305KS b) At a certain digit, brightness is low. c) Only one indicator does not light. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up. g) The figure of all digits flicker. 3) Other possible problems caused by defective control unit. a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible. 3. If the Key unit or control unit is defective.
R305KS G1 G2 G3 G4 G5 START 2 WARM 9 TIMER CLOCK 5 1 MINUTE PLUS 3 STOP CLEAR 8 4 POPCORN 6 POWER LEVEL 0 7 Pin NO. G12 G6 G7 G8 G9 REHEAT G10 COOK G11 MELT SOFTEN DEFROST G12 Pin NO. G1 Key unit ribbon cable Key unit (Membrane Switch) front view [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.
R305KS [15] Procedure N : 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. STEPS 1 2 OCCURRENCE Only pattern at “a” is broken.
R305KS Service Manual CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY R305KS [1] OUTLINE OF TOUCH CONTROL PANEL This circuit consists of 14 segments and 3 common electrodes using a Liquid Crystal Display. The touch control section consists of the following units. 3) Power Source Circuit 1) Key Unit 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.
R305KS Pin No. 24 Signal COM2 I/O OUT 25 26-39 COM3 SEG0-SEG13 OUT OUT 40 41 SEG14 P70 OUT OUT Description Common data signal. Connected to LCD signal COM3. 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.
R305KS Pin No. 62 Signal P22 I/O OUT 63 BZO90 OUT Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P50, P51, P52 and P53 terminal while one of G8 line keys on key matrix is touched. Signal to sound buzzer (2.0 kHz). A: key touch sound. B: Completion sound. 0.1 sec. H : GND A 2.0 sec. L : -5V H : GND B L : -5V 64 P20 OUT Terminal not used. [3] SERVICING FOR TOUCH CONTROL PANEL 1.
R305KS Service Manual SOLDER CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE R305KS [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.
R305KS Service AND Manual ADJUSTMENT PROCECHAPTER 11. COMPONENT REPLACEMENT R305KS 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.
R305KS [2] OUTER CASE REMOVAL 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. Slide the entire outer case back out about 1 inch (3 cm) to free it from retaining clips on the cavity face plate.
R305KS 2. REINSTALLATION 4. Hold the other end of the chassis support to the magnetron with the one (1) screw. 1. Reinstall the magnetron to waveguide flange with the four (4) screws. 5. Reconnect the wire leads to the magnetron. Refer to "PICTORIAL DIAGRAM". 2. Reinstall the air duct to the oven cavity top plate and the magnetron with two (2) screws. 6. Reinstall outer case and check that the oven is operating properly. CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.F.
R305KS Screws Rubber connector LED sheet LCD holder Control unit Liquid crystal display Panel sub assembly Control panel frame Control panel frame Display window Membrame switch Graphic sheet Slit Ribbon cable of membrane switch Figure C-2a Graphic Sheet and Membrane Switch Replacement Figure C-2b Ribbon Cable of Membrane Switch [9] TURNTABLE MOTOR REMOVAL 5. Disconnect wire leads from turntable motor. 1. Disconnect the power supply cord. (See "Positive lock connector removal") 2.
R305KS Make sure that the fan blade rotates smooth after installation. 3. Apply the screw lock tight into the hole (for shaft) of the fan blade. 4. 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. Make sure that the axis of the shaft is not slanted. 6. Connect the wire leads to the magnetron and fan motor, referring to the pictorial diagram. 5.
R305KS 2. REINSTALL 2. Reconnect wire leads to each switch. Refer to pictorial diagram. 1. Reinstall 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. 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.
R305KS 16.Now, door screen is free. Pin 17.Remove the door decoration from the door frame by straightening all tabs of the door decoration. 18.Now, the door decoration is free. Upper Oven Hinge Upper Oven Hinge 2. REINSTALL 1. Re-install the door screen and the door decoration to door frame. 2. Reinstall the latch spring to the latch head. Reinstall the latch spring to the door frame. Reinstall latch head to door frame. Slit choke of door panel 3.
1 T1 Figure S-1. Pictorial Diagram 12 – 1 R E D B L K R E D P N K W H T RY1 GRY GRY COM. BLK GRY WHT WHT MONITOR SWITCH COM. SECONDARY NO INTERLOCK SWITCH N.C. WHT GRY GRY GRN WHT RED RED GRY GRY OVEN LAMP GRY T HE R MAL C UT -OUT (OV E N) TURNTABLE MOTOR RED PNK BLK PNK BLK WHT RED C/T FUSE RED NOISE FILTER FUSE RED HIGH VOLTAGE CAPACITOR POWER TRANSFORMER H.V.
Figure S-2. Control Unit Circuit 12 – 2 C OM MIC R O B2 DOOR S W NS ING C N-B S W IT C H B1 NO C OM NO AC (H) AC 120V 60HZ OV E N LAMP T UR NT AB LE MOT OR F AN MOT OR AC (N) VR S 1 10G 471K a R Y1 R Y2 c b ( J 1) d C 12 WHA Q21 DT D1 4 3E S WHA C8 R2 - + 220uF /10V D40 HZ4B 3 ZD1 Q22 DT A123J S SP1 Q2 K T A1267Y 82, 1/4W 560 1/2W R1 P OWE R UNIT - + - 1000uF /25V 10uF /35V + DOOR M C OM BZ BL VR INT -5V C2 R 30 D4 D2 0.1uF /50V LD1 LD2 LD3 G ND 3.
R305KS [3] Printed Wiring Board of Power Unit(Figure S-3) Figure S-3.
R305KS 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. Parts 3. PART NO. Parts 4. DESCRIPTION MODEL R-305KS marked "*" may cause undue microwave exposure. marked " " are used in voltage more than 250V.
R305KS [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 4-3 1-6 4-16 6-3 7-6 1-12 4-13 1-3 7-1 7-8 1-7 7-3 7-10 6-4 7-10 4-7 7-10 4-4 7-3 1-8 7-7 7-10 4-8 7-8 1-11 6-5 4-6 6-2 7-4 4-10 1-9 4-12 6-1 4-14 4-12 7-5 4-17 7-7 4-1 1-1 4-5 1-10 7-1 1-2 4-11 7-8 2-2 1-1 4-2 7-1 1-5 7-10 1-4 2-3 7-10 2-3 2-3 7-10 7-10 2-3 4-12 2
R305KS NO.
R305KS [2] DOOR AND CONTROL PANEL PARTS 5-7 5-2 5-1 5-3 5-4 5-9 5-8 5-6 5-5 3-8 3-5 3-6 3-4 3-1 3-7 3-3 3-2-3 3-2-6 3-2 3-2-5 3-2-2 6-7 3-2-4 6-6 3-2-1 4
R305KS NO.
R305KS INDEX PARTS CODE [ D ] DPWBFC414WRUZ [ F ] FACCDA098WREZ FACCDA099WREZ FACCDA109WREZ FACCDA110WREZ FDORFA364WRTZ FFS-BA037WRKZ FH-DZA075WRK0 FH-DZA109WRKZ FH-DZA112WRKZ FPNLCB860WRKZ FPWBFA385WRKZ FROLPA101WRKZ FW-VZC048WREZ [ G ] GCABUA935WRPZ GCOVHA450WRFZ GDAI-A360WRWZ GLEGPA074WRE0 GMADIA142WRRZ GWAKPA998WRFZ [ H ] HDECQA285WRPZ HDECQA286WRPZ HDECQA287WRRZ HPNL-A841WRRZ [ J ] JBTN-B316WRFZ [ L ] LBNDKA163WRPZ LHLD-A262WRFZ LSTPPA188WRF0 LX-CZ0052WRE0 LX-CZA070WRE0 LX-CZA073WRE0 LX-EZA042WRE0 [
