TopPage R408LS SERVICE MANUAL SY612R408LPSTF MICROWAVE OVEN MODEL R-408LS 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 [13] L: RELAY TEST .......................................... 8-5 [14] M: DEFROST TEST.................................... 8-6 [15] N: FOIL PATTERN ON THE PRINTED WIRING BOARD TEST............................... 8-6 BEFORE SERVICING CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY [1] OUTLINE OF TOUCH CONTROL PANEL ...............................................................
R408LS R408LS 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.
R408LS Service Manual CHAPTER 1. WARNING TO SERVICE PERSONNEL R408LS 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.
R408LS Service Manual CHAPTER 2. MICROWAVE MEASUREMENT PROCEDURE R408LS [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.
R408LS CHAPTER 3. FOREWORD AND WARNINGService R408LS 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-408LS. 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.
R408LS CHAPTER 4. PRODUCT DESCRIPTION R408LS Service Manual [1] SPECIFICATIONS ITEM Power Requirements Power Consumption Power Output Outside Dimensions Cooking Cavity Dimensions (1.4 Cubic feet) Control Complement Oven Cavity Light Safety Standard DESCRIPTION 120 Volts 60 Hertz Single phase, 3 wire grounded 1600W / Approx. 13.
R408LS CHAPTER 5. GENERAL INFORMATION R408LS 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.
R408LS 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.
R408LS CHAPTER 6. OPERATION R408LS 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 the door sensing switch and primary interlock switch. (In this condition, the monitor switch contacts are opened.) When Variable Cooking Power is programmed, the 120 volts A.C.
R408LS [2] OVEN SCHEMATIC 1. Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY "TO LOAD" B2 DOOR SENSING SWITCH POWER TRANSFORMER B1 GRN GND " indicates components with potentials above 250V (RY2) SECONDARY INTERLOCK RELAY C2 C1 MAGNETRON H 120VAC 60Hz NOTE: " MAGNETRON TEMPERATURE FUSE MONITOR FUSE (20A) BLK "TO SOURCE" OVEN THERMAL CUT-OUT C3 N CONTROL UNIT (RY1) HIGH VOLTAGE CAPACITOR 0.
R408LS [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. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and released from latch hook. Now the door will open.
R408LS CHAPTER 7. TROUBLESHOOTING GUIDEService R408LS 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.
R408LS CHAPTER 8. TEST PROCEDURES R408LS Service Manual [1] 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.
R408LS 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. NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts. [4] 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.
R408LS [7] F: SECONDARY 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. 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.
R408LS [9] H: BLOWN MONITOR FUSE 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. If the monitor fuse is blown when the door is opened, check the primary interlock switch, secondary interlock relay (RY2), relay (RY1) and monitor switch according to the “TEST PROCEDURE” for those switches before replacing the blown monitor fuse.
R408LS 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. 2) In connection with indicators a) At a certain digit, all or some segments do not light up. 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.
R408LS 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 the cabinet side terminal of the relay RY1 and the lower side terminal of the relay RY2 on the control unit with an A.C. voltmeter.
R408LS 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 563Ω±10%). If any abnormal condition is detected, replace the control unit. a 6) Reconnect all leads removed from components during testing. 7) Reinstall the outer case (cabinet). c 8) Reconnect the power supply cord after the outer case is installed.
R408LS Service Manual CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY R408LS [1] OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit This circuit generates voltage necessary in the control unit from the AC line voltage. The touch control section consists of the following units. (1) Key Unit In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit. (2) Control Unit (The Control Unit consists of Power Unit and LSI Unit).
R408LS 2. Servicing the touch control panel with power supply from an external power source: Disconnect the touch control panel completely from the oven proper, and short both ends of the door sensing switch (on PWB) of the touch control panel, which brings about an operational state that is equivalent to the oven door being closed.
R408LS Service Manual SOLDER CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE R408LS [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.
R408LS Service AND Manual ADJUSTMENT PROCECHAPTER 11. COMPONENT REPLACEMENT R408LS 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.
R408LS [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 two (2) screws from rear. 5. Slide the entire outer case back out about 1 inch (3 cm) to free it from retaining clips on the cavity face plate. 6. Lift entire outer case from the unit.
R408LS 5. Reinstall outer case and check that the oven is operating properly. CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY. [6] OVEN LAMP REMOVAL 1. Disconnect the power supply cord and then remove outer case. 7. Now, the oven lamp is free. 2. Open the oven door and block it open. 3. Discharge high voltage capacitor. Terminal 4. Disconnect the wire leads from the oven lamp. Oven lamp 5.
R408LS 5. Install the fan motor assembly to the oven cavity back plate with two (2) screws. 6. Connect the wire leads to the magnetron and fan motor, referring to the pictorial diagram. 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 [10] CONTROL PANEL ASSEMBLY REMOVAL 1. Disconnect the power supply cord and then remove outer case. 5.
R408LS [12] DOOR SENSING SWITCH/PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL 1. REMOVAL At this time switch lever will be free, do not lose it. 1. Disconnect the power supply cord and remove outer case. 2. REINSTALLATION 2. Open the door and block it open. 4. Disconnect wire leads from the switches. 1. Reinstall each switch in its place. The primary interlock/ monitor switches are in the lower position and the door sensing switch is in the upper position. 5.
R408LS 4. Check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.) Door stopper 1 NOTE: The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle. This function does not require that door be air-tight, moisture (condensation)-tight or light-tight.
Figure S-1. Pictorial Diagram 12 – 1 ORG WHT GRY RY1 T1 COM. PRIMARY NO INTERLOCK SWITCH N.C. RED GRY GRY WHT WHT COM. WHT WHT GRY GRN WHT GRY TURNTABLE MOTOR BRN ORG OVEN LAMP RED THERMAL CUT-OUT (OVEN) RED RED RED WHT WHT MAGNETRON TEMP FUSE ORG ORG N POWER SUPPLY CORD 120V 60Hz NOTE: The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw. The screw must always be kept tight.
AC(N) DOOR SENSING SWITCH MICRO AC(H) OVEN LAMP, TURNTABLE MOTOR, FAN MOTOR B-2 B-1 d a D1~D4 RY1 NOTE: D31 1SS270A D30 1SS270A DU12D1-1P(M)-R RY2 D6 R3 KTA1267Y Q2 4.7K 1/4W R5 510 1/2W POWER UNIT Q4 DTA123JS 10u/35V C5 Q3 DTD143ES SP1 LTST-C190KGKT x 4 LD4 LD3 LD2 LD1 27 1/4W R4 1SS270A x2 D5 R2 JUMPER WIER : IF NOT SPECIFIED 1/10W 5% 0.
R408LS [3] Printed Wiring Board (Figure S-3) Figure S-3.
R408LS 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 MICROWAVE OVEN MODEL R-408LS Parts marked "*" may cause undue microwave exposure. Parts marked " " are used in voltage more than 250V.
R408LS [1] OVEN PARTS 7-10 7-2 7-10 2-1 4-13 7-2 6-3 6-4 1-6 4-11 1-10 7-1 1-2 7-9 4-15 7-6 1-7 4-3 1-1 1-3 7-5 7-8 4-5 7-11 7-8 4-4 7-10 4-8 1-5 4-7 4-12 7-3 7-10 7-3 6-2 7-7 4-10 4-1 1-12 1-11 1-4 4-14 1-13 7-1 6-1 1-2 2-2 1-4 7-8 4-6 4-2 1-9 1-8 7-1 7-10 7-10 2-3 2-3 7-4 2-3 2-3 2 4-9
R408LS NO. PARTS CODE PRICE NEW PART RANK MARK RANK DESCRIPTION [1] OVEN PARTS ELECTRIC PARTS 1-1 FPWBFA417WRKZ 1-1 FPWBFA389WRKZ 1-2 FFS-BA033WRKZ 1-2 FFS-BA037WRKZ 1-3 QFS-TA013WRE0 1-4 QSW-MA085WRE0 1-4 QSW-MA147WRZZ ! * ! ! ! ! * * AY AW -AN AG AF AG Noise filter assembly Noise filter assembly (Interchangeable) Monitor fuse 20A and monitor switch(V-5220Q) Monitor fuse 20A and monitor switch(D3V-1G-2C25) (Interchangeable) Temp.
R408LS [2] DOOR AND CONTROL PANEL PARTS 5-8 5-9 5-2 5-5 5-9 5-3 5-1 5-3-1 5-9 5-7 5-3-2 5-6 3-1 3-3 5-4 3-3 3-1-2 3-2 3-1-4 3-1-1 3-1-1-1 3-1-3 6-5 3-1-1-2 Actual wire harness may be different from illustration.
R408LS NO.
R408LS INDEX PARTS CODE [ D ] DPNLCC019WRKZ DPWBFC563WRKZ [ F ] FACCDA083WRE0 FACCDA085WREZ FACCDA103WREZ FBTN-A164WRKZ FDORFA412WRTZ FFS-BA033WRKZ FFS-BA037WRKZ FH-DZA118WRKZ FH-DZA131WRKZ FPWBFA389WRKZ FPWBFA417WRKZ FROLPA097WRKZ FWAKPA462WRKZ FW-VZC093WREZ FW-VZC094WREZ [ G ] GCABUB010WRPZ GCOVHA382WRF0 GDAI-A403WRWZ GLEGPA104WREZ GWAKPB081WRFZ [ H ] HDECQA328WRPZ HDECQA329WRPZ HDECQA334WRRZ HPNL-A890WRRZ [ J ] JBTN-B391WRFZ [ L ] LANGTA419WRPZ LBNDKA172WRPZ LSTPPA139WRF0 LSTPPA167WRF0 LX-CZ0052WRE0 LX
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