SERVICE MANUAL ® S10212R671EHW SUPPLEMENT % Kg AUTO COOK MICROWAVE OVEN WITH TOP AND BOTTOM GRILL AUTO DEF WATT /Kg STOP +1min MODEL R-671 R- 671 (W) F In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. This service manual covers only those items that differ from the S10808R671EHW.
® SERVICE MANUAL S10808R671EHW MICROWAVE OVEN WITH TOP AND BOTTOM GRILL % Kg AUTO COOK MODELS AUTO DEF WATT /Kg STOP +1min R-671 R-671(B) R-671(W)E R-671(W) R-671(IN)E R-671(IN) R-671(B)E R-671(W)N In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. TABLE OF CONTENTS Page CAUTION, MICROWAVE RADIATION ....................................................................................................
CAUTION MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output microwave connections, waveguides, flanges and gaskets must be secured. Never operate the device without a microwave energy absorbing load attached. Never look into an open waveguide or antenna while the device is energized.
SERVICE MANUAL ® MICROWAVE OVEN WITH TOP AND BOTTOM GRILL R-671(B)/ R-671(W)/ R-671(IN) GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service. WARNING Note: The parts marked "*" are used in voltage more than 250V.
SERVICING WARNING TO SERVICE PERSONNEL GB Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage harness. REMEMBER TO CHECK 3D REMEMBER TO CHECK 4R 1) Disconnect the supply. 2) Door opened, and wedged open. 3) Discharge high voltage capacitor. 1) Reconnect all leads removed from components during testing.
SERVICING CONT... E Los hornos de microondas contienen circuitos eléctricos capaces de producir voltajes de alta tensión y descargas eléctricas. Para evitar el riesgo de electrocución, absténgase de tocar los siguientes componentes: condensador de alta tensión, transformador de alta tensión, magnetrón, dispositivo del rectificador de alta tensión y arnés de alta tensión. RECUERDE LA COMPROBACION 3D RECUERDE LA COMPROBACION 4C 1) Desconecte la alimentación. 2) Deje la puerta abierta y calzada.
SERVICING CONT... I I forni a microonde contengono un circuito elettrico in grado di generare tensioni e correnti estremamente elevate. L’eventuale contatto con i seguenti componenti può causare la folgorazione: condensatore ad alta tensione; trasformatore ad alta tensione; magnetron; rettificatore alta tensione; cablaggio ad alta tensione. TRE OPERAZIONI IMPORTANTI PER INCOMINCIARE QUATTRO VERIFICHE IMPORTANTI DA NON DIMENTICARE 1) Scollegare l'alimentazione elettrica.
PRODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements Power Consumption Power Output Grill heating element Power Output (Top Grill) Bottom heating element Power Output Case Dimensions Cooking Cavity Dimensions Turntable diameter Control Complement Set Weight 230 Volts 50 Hertz Single phase, 3 wire earthed Microwave cooking 1.3 kW Approx. 5.8 A Top Grill mode ..................... 0.75 kW Approx. 3.3 A Grill cooking Bottom Grill mode ................ 0.45 kW Approx. 2.
APPEARANCE VIEW OVEN 10 3 11 12 2 1 6 8 5 4 9 7 14 13 1. 2. 3. 4. 5. 6. 7. 8. Control panel Oven lamp Grill heating element (Top Grill) Door opening button Waveguide cover Oven cavity Turntable motor shaft Grill heating element (Bottom Grill) 9. Door seals and sealing surfaces 10.Ventilation openings 11.Outer cabinet 12.Power supply cord 13.Turntable 14.Rack CONTROL PANEL DIGITAL DISPLAY AND INDICATORS 1. WATT indicator 2. WEIGHT indicator 3. LESS /MORE indicator 4. CLOCK indicator 5.
OPERATION SEQUENCE OFF CONDITION Switch Closing the door activates the primary latch switch and the stop switch. IMPORTANT: When the oven door is closed, the contacts COM-NC of the monitor switch must be open. When the microwave oven is plugged in a wall outlet (230V / 50Hz), the line voltage is supplied to the noise filter. Figure O-1 on page 32 1. The control unit is not energized. The display shows nothing (Fig. O-1 (a)). 2. Open the door.
OPERATION SEQUENCE CONT... TOP GRILL MODE In this mode, the food is cooked by the grill heating element (top grill). Select the TOP GRILL mode with the COOKING MODE selector. Enter the cooking time by rotating the TIME/WEIGHT dial. When the START button is pressed, the following operations occur: 1. 2. 3. 4. 5. 6. Figure O-3(a) on page 33 The relay RY1 + RY3 + RY5 are energized. The numbers of the digital readout start the count down to zero.
OPERATION SEQUENCE CONT... PIZZA COOKING Cooking mode PIZZA automatically works out the correct cooking mode and time for cooking. Chose menu with the PIZZA button and enter the weight of the food with the TIME/WEIGHT dial. Once the oven starts, it will cook according to the special cooking sequence. AUTO COOKING AUTO COOK automatically works out the correct cooking mode and time for cooking. Chose menu with the AUTO COOK button and enter the weight of the food with the TIME/WEIGHT dial.
FUNCTION OF IMPORTANT COMPONENTS CONT... SPECIAL FUSE F1 15A TURNTABLE MOTOR TTM If the wire harness or electrical components are shortcircuited, this fuse F1 blows to prevent an electric shock of fire hazard. The turntable motor drives the turntable roller assembly to rotate the turntable. FUSE F2 F8A 250V FAN MOTOR FM 1. If the wire harness or electrical components are shortcircuited, this fuse blows to prevent an electric shock or fire hazard. 2.
TROUBLESHOOTING GUIDE CONT... TEST PROCEDURE POSSIBLE CAUSE AND DEFECTIVE PARTS CONDITION PROBLEM Fuse F1 15A blows when power cord is plugged into wall outlet. Fuse F2 F8A blows when the door is opened. OFF CONDITION Oven lamp does not light when door is opened. (Display operates.) Home fuse blows when power cord is plugged into wall outlet. Nothing appear in display when power cord is plugged into wall outlet and open and close the door. Display does not operate properly when STOP button is pressed.
TEST PROCEDURES PROCEDURE LETTER A MAGNETRON TEST COMPONENT TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS. Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron filament terminals, the meter should show a reading of less than 1 ohm.
TEST PROCEDURES CONT... PROCEDURE LETTER COMPONENT TEST Initial temperature .................................................................................................. T1 = 11°C Temperature after (52 + 3) = 55 sec ...................................................................... T2 = 21°C Temperature difference Cold-Warm ...................................................................... ∆T1 = 10C Measured output power The equation is “P = 80 x ∆T” ...........................................
TEST PROCEDURES CONT... PROCEDURE COMPONENT TEST LETTER D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance. F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance. G. The resistance across all the terminals and the chassis must be infinite when the capacitor is normal. If incorrect reading are obtained, the high voltage capacitor must be replaced.
TEST PROCEDURES CONT... PROCEDURE LETTER COMPONENT TEST If the fuse F8A (F2) is blown by incorrect door switching replace the defective switch(es) and the fuse F8A (F2). CARRY OUT 4R CHECKS. CAUTION: I Only replace fuse with the correct value replacement. NOISE FILTER TEST N L LINE CROSS CAPACITOR 0.22µ/250V F1: FUSE 15A CARRY OUT 3D CHECKS. NOISE FILTER 10M/0.5W Disconnect the leads from the terminals of noise filter.
TEST PROCEDURES CONT... PROCEDURE COMPONENT TEST LETTER L TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance can not be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is in two units, control unit and key/jog unit and troubleshooting by replacement is described according to the symptoms indicated. Control Panel.
TEST PROCEDURES CONT... PROCEDURE COMPONENT TEST LETTER O PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN 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. If the foil pattern is open, follow the troubleshooting guide given below for repair. Problem: POWER ON, indicator does not light up. CARRY OUT 3D CHECKS.
CONTROL PANEL ASSEMBLY OUTLINE OF CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit. The principal functions of these units and the signals communicated among them are explained below. Tact Switch Signals generated in the LSI are sent to the tact switches. When a tact switch is touched, a signal is completed through the tact switch and passed back to the LSI through to perform the function that was requested.
DESCRIPTION OF LSI CONT... Pin No. 12 Signal P56 I/O OUT Description Oven lamp and turntable motor driving signal(Square Waveform : 50Hz). To turn on and off shut-off relay (RY1). The square waveform voltage is delivered to the relay (RY1) driving circuit . 13 14 P55 P54 OUT OUT Terminal not used. Signal to sound buzzer. A: key touch sound. B: Completion sound. 20 msec H L During cooking 0.12 sec H: GND A L 2.
DESCRIPTION OF LSI CONT... Pin No. Signal I/O Description 27 RESET IN 28-29 30 P71-P70 XIN OUT IN 31 XOUT OUT 32 VSS IN 33 P27 OUT 34 P26 OUT 35 P25 OUT P24-P20 P17 OUT IN 42 P16 IN 43 P15 IN 44-48 49-56 57-60 P14-P10 P07-P00 P37-P34 IN OUT IN Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level.
SERVICING 1. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc., and sometimes it is not fully protected by the built-in protection circuit.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Disconnect oven from power supply. 2. Make sure that a definite “click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch leads to rise, it is then possible to hear a “click” as the door switches operate.) 3.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONT... HIGH VOLTAGE TRANSFORMER REMOVAL 1. CARRY OUT 3D CHECKS. 2. Disconnect the filament leads of high voltage transformer from high voltage capacitor and the magnetron. 3. Disconnect the H.V. wire A from the high voltage transformer. 4. Disconnect the main wire harness from the high voltage transformer. 5. Remove the HVT thermal cut-out from the high voltage transformer. 6. Remove the four (4) screws holding the transformer to power angle. 7.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONT... FAN MOTOR REPLACEMENT REMOVAL 1. CARRY OUT 3D CHECKS. 2. Disconnect the wire leads from the fan motor. 3. Remove the two (2) screws holding the fan motor to the power angle. 4. Remove the fan blade from the fan motor shaft according to the following procedure. 1) Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers. CAUTION: • Make sure that any pieces do not enter the gap between the rotor and the starter of the fan motor.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONT... POWER SUPPLY CORD REPLACEMENT Removal Re-install 1. CARRY OUT 3D CHECKS. 2. Remove the one (1) screw holding the green/yellow wire to the power angle. 3. Disconnect the leads of the power supply cord from the noise filter, referring to the Figure C-4(a). 4. Release the power supply cord from the power angle. 5. Now, the power supply cord is free. 1.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONT... PRIMARY LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT If the primary latch switch, stop switch and monitor switch do not operate properly due to a mis-adjustment, the following adjustment should be made. 1. CARRY OUT 3D CHECKS. 2. Loosen the one (1) screw holding the latch hook to the oven cavity front flange. 3. With the door closed, adjust the latch hook by moving it back and forward or up and down.
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONT... 5. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges. 6. Re-install choke cover to door panel by pushing. Note: After any service to the door; (A) Make sure that door sensing switch and primary latch switch are operating properly. (Refer to chapter "Test Procedures".). (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards.
MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven. 2. 3. REQUIREMENT The safety switch must prevent microwave radiation emission in excess of 5mW/cm2 at any point 5cm or more from external surface of the oven.
TEST DATA AT A GLANCE PARTS Special fuse Fuse Thermal cut-out (HVT) Thermal cut-out (OVEN) Grill heating element (top) Bottom heating element Oven lamp High voltage capacitor Magnetron Power transformer SYMBOL F1 F2 TC1 TC2 GH1 GH2 OL C MG T VALUE / DATA 15A / 250V F 8A 145°C Off / 115˚C On 150°C Off / 130˚C On Approx. 76 Ω / Insulation resistance > 10 MΩ Approx. 132 Ω / Insulation resistance > 10 MΩ 230–240 V 25W AC 2100V 1.02µF Filament < 1Ω / Filament – chassis ∞ ohm.
N RY6 RY2 CONTROL UNIT SW1: PRIMARY LATCH SWITCH R-671 - 32 NC. SW2: STOP SWITCH NC. SW3: MONITOR SWITCH Figure O-1(c) Oven Schematic-OFF Condition after the oven door is closed. H.V. RECTIFIER C: CAPACITOR 1.2µF AC2100V MG: MAGNETRON T: HIGH VOLTAGE TRANSFORMER NC. GH1: GRILL HEATING(TOP) ELEMENT SW1: PRIMARY LATCH SWITCH H.V. RECTIFIER C: CAPACITOR 1.2µF AC2100V MG: MAGNETRON T: HIGH VOLTAGE TRANSFORMER GH1: GRILL HEATING(TOP) ELEMENT GH2: BOTTOM HEATING ELEMENT NC.
N RY6 R-671 - 33 RY3 RY2 CONTROL UNIT SW1: PRIMARY LATCH SWITCH NC. SW2: STOP SWITCH NC. SW3: MONITOR SWITCH Figure O-3(b) Oven Schematic-Grill cooking Condition (BOTTOM GRILL mode) H.V. RECTIFIER C: CAPACITOR 1.2µF AC2100V MG: MAGNETRON T: HIGH VOLTAGE TRANSFORMER GH1: GRILL HEATING(TOP) ELEMENT NC. GH2: BOTTOM HEATING ELEMENT SW1: PRIMARY LATCH SWITCH TURNTABLE MOTOR H.V. RECTIFIER C: CAPACITOR 1.
N RY6 R-671 - 34 RY3 RY2 CONTROL UNIT SW1: PRIMARY LATCH SWITCH NC. SW2: STOP SWITCH NC. SW3: MONITOR SWITCH Figure O-4(b) Oven Schematic-Dual cooking Condition (Microwave and Bottom Grill mode) H.V. RECTIFIER C: CAPACITOR 1.2µF AC2100V MG: MAGNETRON T: HIGH VOLTAGE TRANSFORMER GH1: GRILL HEATING(TOP) ELEMENT NC. H.V. RECTIFIER C: CAPACITOR 1.2µF AC2100V MG: MAGNETRON T: HIGH VOLTAGE TRANSFORMER GH1: GRILL HEATING(TOP) ELEMENT GH2: BOTTOM HEATING ELEMENT TURNTABLE MOTOR NC.
G R Y Y L W R-671 - 35 RY4 COM RY3 RY6 RY1 COM COM RY2 1 CN-C 11 9 T1 CN-A RY5 1 CN-B 2 CONTROL UNIT 1 CN-A BRN RED BLK BLK RED BLK ORG GRN RED GRY WHT BLU YLW RED GRN CN-B GRN 1 2 3 4 5 6 7 9 8 1 2 WHT BLU GRY RED GRY GRY TTM: TURNTABLE MOTOR GH2: BOTTOM HEATING ELEMENT WHT YLW RED ORG WHT BLU TC2: THERMAL CUT-OUT(OVEN) GH1: TOP GRILL HEATING ELEMENT ORG Figure S-1.
HIGH VOLTAGE TRANSFORMER TOP HEARTING ELEMENT BOTTOM HEARTING ELEMENT FAN MOTOR c a 4 Q3 2SB1238 RY2 RY3 RY1 RY4 RY5 RY6 b 10G471K 8 6 D2 D1 R9 1k : 0.1µ / 16v : 1/4w ± 5% : 1SS270A NOTE : IF NOT SPECIFIED N.O. COM N.O. COM N.O. COM A9 A7 A5 A3 VRS1 d (J1) AC230V 50Hz T1 C3 0.1µ/50v 1 D4 D3 C1 0.1µ/50v – + CN-B R10 240 2 R40 3.3k R2 510 1w (J8) C20 0.1µ/50v ZD1 HZ5C-2 SW60 – + C6 10µ/35v B C CN-C 6 R4 4.7k R52 100k R53 100k R51 4.7k R50 4.
SW1 A B C ( CPU UNIT ) Figure S-3. Printed Wiring Board R-671 - 37 SW1 R50 VR1 R51 ( KEY AND JOG UNIT ) WH - B C51 C50 20 SW8 SW9 SW4 SW5 SW6 LD5 SW7 R52 R53 DCUT A 1 2 3 21 22 23 24 WH - B C51 C50 20 R51 B C R50 VR1 SW8 SW9 SW4 SW5 SW6 LD5 SW7 R52 R53 1 2 3 21 22 23 24 CIRCUIT DIAGRAMS CONT...
PARTS LIST Note: The parts marked "∆" may cause undue microwave exposure. / The parts marked "*" are used in voltage more than 250V. / "§" Mark: Spare parts delivery section. ELECTRIC PARTS * ∆* * * REF. NO. C F1 F2 FM GH1 GH2 MG OL SW1 SW2 SW3 T TC1 TC2 TTM 1- 1 1- 2 1- 3 PART NO.
PARTS LIST CONT... CONTROL PANEL PARTS CONT... ∆ REF. NO. R1-2 R4-5 R6-8 R9 R10 R12 R30 R31 R40 R50-51 R52-53 R68-70 R80 RY1 RY2 RY3 RY4 RY5-6 SP1 SW4-9 T1 VR1 VRS1 ZD1 ZD2 ZD3 3- 2 3- 2 3- 2 3- 3 3- 3 3- 3 3- 4 3- 5 3- 6 3- 6 3- 6 3- 7 3- 7 3- 7 3- 8 3- 8 3- 8 3- 9 3- 10 3- 11 3- 11 3- 11 3- 12 3- 12 3- 12 3- 13 3- 14 PART NO.
PARTS LIST CONT... OVEN PARTS CONT... ∆ * * REF. NO. 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23 4-24 4-25 4-26 4-27 4-28 PART NO.
CABINET AND UNIT CHASSIS PARTS OVEN PARTS 7-8 7-6 6-10 4-7 2-1 7-8 7-9 7-11 4-6 7-7 OL 7-7 GH1 4-13 7-11 4-21 4-13 7-8 7-9 F2 7-2 F1 7-5 TC2 MG 4-3 1-2 4-16 4-28 4-10 4-24 4-17 4-8 7-4 7-6 GH2 SW3 7-12 4-15 SW1 6-2 4-20 7-3 4-11 SW2 7-8 7-7 4-23 4-14 4-19 4-4 7-4 4-12 7-7 TTM 7-4 1-3 1-1 7-6 4-2 7-7 4-22 4-1 7-6 1-3 7-7 FM 4-26 C 7-6 4-2 4-9 6-9 7-7 7-8 T 7-6 2-2 6-6 4-25 6-8 4-18 7-8 7-7 NOTE: In the event of removing the turntable motor cover, t
CONTROL PANEL/DOOR PARTS CONTROL PANEL PARTS 3-1D 3-9 3-1E 3-1F 3-5 3-2 3-10 3-13 3-7 3-14 x 6 3-11 3-1 3-8 3-14 x 6 3-12 DOOR PARTS 3-6 3-4 3-3 5-2 4-27 5-8 5-1 5-7 5-8 5-8 5-8 5-4 5-5 5-6 5-3 R-671 - 42
MISCELLANEOUS/PACKING AND ACCESSORIES MISCELLANEOUS 6-4 6-3 6-6 6-5 6-7 Actual wire harness may be different from illustration. PACKING AND ACCESSORIES TOP PAD ASSEMBLY (FPADBA008URK0) PRINTED MATTER OVEN BAG (SSAKHA041WRE0) OUTER WRAP COVER [R-671(B)] (SPADFA353WRE0) RACK DOOR PROTECTION SHEET (SPADPA531WRE0) TURNTABLE TRAY ACCESSORY HOLDER (SPADPA010URE0) BOTTOM PAD ASSEMBLY (FPADBA007URK0) INTO THE OVEN CAVITY Not Replaceable Items.
® '98 SHARP CORP. (7S1.31E) Printed in U.K.
