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CAUTION,MICROWAVE RADIATION, WARNING ............................................................. INSIDE COVER
GENERAL IMPORTANT INFORMATION .................................................................................................. 1
SERVICING ................................................................................................................................................ 2
PRODUCT SPECIFICATIONS ................................................................................................................... 5
APPEARANCE VIEW ................................................................................................................................. 6
OPERATION SEQUENCE .......................................................................................................................... 7
FUNCTION OF IMPORTANT COMPONENTS .......................................................................................... 8
TEST PROCEDURES .............................................................................................................................. 10
TOUCH CONTROL ASSEMBLY ............................................................................................................... 18
DISCRIPTION LSI ..................................................................................................................................... 19
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................... 22
TEST DATA AT A GLANCE ..................................................................................................................... 27
MICROWAVE MEASUREMENT .............................................................................................................. 28
SCHEMATIC DIAGRAMS ......................................................................................................................... 29
PICTORIAL DIAGRAM ..............................................................................................................................31
CONTROL PANEL CIRCUIT .................................................................................................................... 32
SWITCH UNIT CIRCUIT ............................................................................................................................33
PRINTED WIRING BOARD DIAGRAM .................................................................................................... 34
PRINTED WIRING BOARD OF SWITCH UNIT ........................................................................................35
PARTS LIST ............................................................................................................................................. 36
EXPLODED VIEW OF OVEN .................................................................................................................... 39
CONTROL PANEL / DOOR PARTS ..........................................................................................................40
MISCELLENEOUS / PACKING AND ACCESSORIES ............................................................................. 41
SERVICE MANUAL
R
COO K
DEFR OST
MODELS
KG
R-763
R-763(IN)
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
SHARP CORPORATION
S04275R763EHW
GRILL AND
MICROWAVE OVEN
R-763(IN)
Page
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Summary of Contents for Sharp R-763IN
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Page 1: Table Of Contents
SWITCH UNIT CIRCUIT ..........................33 PRINTED WIRING BOARD DIAGRAM ....................34 PRINTED WIRING BOARD OF SWITCH UNIT ..................35 PARTS LIST ............................. 36 EXPLODED VIEW OF OVEN ........................39 CONTROL PANEL / DOOR PARTS ......................40 MISCELLENEOUS / PACKING AND ACCESSORIES ................41 SHARP CORPORATION... - Page 2 CAUTION MICROWAVE RADIATION Personnel should not be exposed to the mircowave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output micro- wave connections, waveguides, flanges and gaskets must be secured. Never operate the device with- out a microwave energy absorbing load attached.
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Page 3: General Important Information
R-763(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. -
Page 4: Servicing
HIGH en stelt de klok van de magnetron in op Sharp beveelt ten sterkste aan dat, voor zover twee (2) minuten. Wanneer de twee minuten voorbij... - Page 5 SERVICING 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.
- Page 6 è rimasta fredda, eseguire i tre controlli iniziali e verificare nuovamente i collegamenti del componente in Sharp raccomanda, nei limiti del possibile, che la ricerca questione. dei guasti avvenga in assenza di alimentazione elettrica. In alcuni casi tuttavia, può essere necessario alimentare Dopo aver portato a termine le operazioni di manutenzione l'apparecchio dopo aver rimosso la scatola esterna.
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Page 7: Product Specifications
PRODUCT SPECIFICATIONS SPECIFICATION ITEM DESCRIPTION Power Requirements 230 Volts 50 Hertz Single phase, 3 wire grounded Power Consumption Microwave cooking 1.45 kW Approx. 6.5 A Grill cooking 1.25 kW Approx. 5.4 A Dual cooking 2.65 kW Approx. 11.7 A Power Output 900W watts nominal of RF microwave energy Grill Heating Element Power Output 1200W (600W x 2) -
Page 8: Appearance View
APPEARANCE VIEW OVEN 1. Door 2. Door hinges 3. Grill Guide 4. Lamp filter Turntable 5. Waveguide cover 6. Contol panel 7. Coupling 8. Door latches 9. Oven cavity Roller stay 10. Safety door latches 11. Door handle Coupling 12. Ventilation openings 13. -
Page 9: Operation Sequence
OPERATING SEQUENCE OFF CONDITION CONDITION Closing the door activates all door interlock switches DURING DOOR OPEN (monitored latch switch and stop switch). SWITCH CONTACT COOKING (NO COOKING) Monitored latch switch COM-NO Closed Open IMPORTANT Monitor switch COM-NC Open Closed When the oven door is closed, the monitor switch contacts COM-NO Closed Open... -
Page 10: Function Of Important Components
OPERATING SEQUENCE GRILL COOKING CONDITION 4. Then following components are energized. In this condition the food is cooked by grill heater energy. Program desired cooking time and grill mode using MODE Power transformer Grill heating elements button and ROTARY knob. When the START button is Magnetron Turntable motor touched, the following operations occur:... - Page 11 FUNCTION OF IMPORTANT COMPONENTS FUSE F1 F8A 250V NOISE FILTER The noise filter prevents the radio frequency interference This fuse blows when monitored latch switch SW1 remains that might flow back in the power circuit. closed with the oven door open and when the contacts (COM + NC) of monitor switch SW2 closes.
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Page 12: Test Procedures
TEST PROCEDURES TEST PROCEDURE A B C D E E E F F G H I K K L M P P P Q POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Fuse F2 15A blows when power cord is plugged into wall outlet. Fuse F8A blows when the door is opened. - Page 13 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECK 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.
- Page 14 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6. Measure the final water temperature. (Example: The final temperature T2 = 21°C) 7. Calculate the microwave power output P in watts from above formula. Initial temperature ......................T1 = 11°C Temperature after (47 + 3) = 50 sec................T2 = 21°C Temperature difference Cold-Warm ................
- Page 15 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST CARRY OUT 4R CHECKS ASYMMETRIC RECTIFIER TEST ASYMMETRIC RECTIFIER CARRY OUT 3D CHECKS. HIGH VOLTAGE RECTIFIER Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric rectifier can be tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminals A + B of the asymmetric rectifier and note the reading obtained.
- Page 16 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST THERMAL CUT OUT TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a continuity test across the two terminals as described in the below. CARRY OUT 4R CHECKS Table: Thermal Cut-out Test PARTS NAME...
- Page 17 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST NOISE FILTER TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of R1: 10M ohm ± 20% the noise filter. R2: 680K ohm ± 20% Using an ohmmeter, check between the Cx ± 20% Cv ±...
- Page 18 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control Unit and Switch Unit, and troubleshooting by unit replacement is described according to the symptoms indicated.
- Page 19 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST TACT SWITCH TEST 1. Disconnect the oven from the power supply. 2. Discharge the high voltage capacitor. 3. Remove the control unit from the control panel. 4. By using an ohmmeter, check the tact switch operation. 5.
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Page 20: Touch Control Assembly
TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit. 5) Buzzer Circuit The buzzer is responsive to signals from the LSI to emit The principal functions of these units and the signals com- audible sounds (key touch sound and completion sound). -
Page 21: Discription Lsi
DESCRIPTION OF LSI LSI(IZA855DR) The I/O signal of the LSI(IZA855DR) are detailed in the following table. Pin No. Signal Description SEG21- Terminal not used. SEG23 COM1 Common data signal: COM1. Connected to LCD (Pin No. 1) COM2 Common data signal: COM2. Connected to LCD (Pin No. - Page 22 DESCRIPTION OF LSI Pin No. Signal Description Grill heating element driving signsl. During To turn on and off the grill heating element cooking relay (RY2). "L" level during grill cooking or (Grill or dual) dual cooking; "H" level otherwise. Magnetron high-voltage circuit driving signal. ON/OFF time ratio in Mi- ON/OFF time ratio in Mi- To turn on and off the cook relay...
- Page 23 TOUCH CONTROL 1. Precautions for Handling Electronic Components panel while keeping it connected to the oven. This unit uses CMOS LSI in the integral part of the B. On some models, the power supply cord between circuits. When handling these parts, the following the touch control panel and the oven proper is so precautions should be strictly followed.
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Page 24: Component Replacement And Adjustment Procedure
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Door does not close firmly. 1. CARRY OUT 3D CHECKS. 2. Make sure that a definite "click" can be heard when the 2. - Page 25 6. After replacement use the one (1) screw provided with 3. Where the corners have been snipped off bend corner the turntable motor assembly to fit the turntable motor areas flat. No sharp edge must be evident after removal cover. of TT motor cover.
- Page 26 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE PRIMARY LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH REMOVAL Stop switch 1. CARRY OUT 3D CHECKS. 2. Remove the control panel assembly referring to “CONTROL PANEL REMOVAL”. 3. Disconnect the leads from all switches. 4. Remove the two (2) screws holding the latch hook to the oven cavity.
- Page 27 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE POWER SUPPLY CORD REPLACEMENT Re-install Removal 1. CARRY OUT 3D CHECKS. 1. Insert the moulding cord stopper of power supply cord 2. Remove the single (1) screw holding the green/yellow into the square hole of the rear cabinet, referring to the wire to the cavity.
- Page 28 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE DOOR REPLACEMENT REMOVAL RE-INSTALL 1. Re-install the front door glass to the door frame as follows. 1. CARRY OUT 3D CHECKS. 1) Insert the left edge of the front door glass into the of the door 2.
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Page 29: Test Data At A Glance
TEST DATA AT A GLANCE Parts Symbol Value / Data Fuse F8A / 250V Special fuse 15A / 250V Thermal cut-out (MG) 125°C Thermal cut-out (OVEN) 160°C Oven lamp 200–250 V 25W E14 High voltage capacitor 1.07µF AC 2100V Magnetron Filament <... -
Page 30: Microwave Measurement
MICROWAVE MEASUREMENT Recommended instruments are: After adjustment of door latch switches, monitor switch and NARDA 8100 door are completed individually or collectively, the following NARDA 8200 leakage test must be performed with a survey instrument HOLADAY HI 1500 and it must be confirmed that the result meets the SIMPSON 380M requirements of the performance standard for microwave 2. -
Page 31: Schematic Diagrams
SCHEMATIC DIAGRAMS NOTE:CONDITION OF OVEN 1. Door closed 2. Cooking mode at microwave position 3. Timer at zero Figure O-1. Oven Schematic-OFF Condition Figure O-2. Oven Schematic-Microwave Cooking Condition R-763 -... - Page 32 SCHEMATIC DIAGRAMS NOTE:CONDITION OF OVEN 1. Door closed 2. Cooking mode at microwave position 3. Timer at zero Figure O-3. Oven Schematic-Grill Condition Figure O-4. Oven Schematic-Dual Cooking Condition R-763 -...
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Page 33: Pictorial Diagram
POWER SUPPLY CORD LIVE NEUTRAL GRILL HEATER EARTH CONTROL PANEL CN-B TC2: OVEN MON’D LATCH TC1: FM: FAN MOTOR OVEN LAMP RY*3 MG: MAGNETRON ASYMMETRIC RECTIFIER RY*2 HV WIRE B STOP RECT HV WIRE A CN-A WHT RED TTM: TURNTABLE C: HV CAPACITOR MOTOR... - Page 34 WH-1 LIQUID CRYSTAL DISPLAY D1-D4 11ES1 WH-2 LD1 LD2 LD3 LD4 DTA123ES D2 D4 AC230V – – 50Hz 2SB1238 KRA101M KRA101M SEG21 SEG 8 SEG22 50 SEG 7 SEG23 49 SEG 6 OVEN LAMP KRC243K COM1 48 SEG 5 FAN MOTOR –...
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Page 35: Switch Unit Circuit
SWITCH UNIT CIRCUIT CN - G Figure S-3. Switch Unit Circuit R-763 -... -
Page 36: Printed Wiring Board Diagram
PRINTED WIRING BOARD DIAGRAM QKITPA018URE0 WH-2 (J3) (J5) (J7) (J8) CN - B (J10) MICRO VRS1 OL/FM /TTM CN - A Figure S-3. Printed Wiring Board R-763 -... -
Page 37: Printed Wiring Board Of Switch Unit
PRINTED WIRING BOARD OF SWITCH UNIT Figure S-5. Printed Wiring Board of Switch Unit R-763 -... -
Page 38: Parts List
PARTS LIST Note: The parts marked “*” are used in voltage more than 250V. The parts marked "∆" may cause undue microwave exposure “§” MARK: SPARE PARTS-DELIVERY SECTION REF. NO. PART NO. § DESCRIPTION Q’TY CODE ELECTRIC PARTS RC-QZA252WRE0 U High voltage capacitor RMOTEA361WRE0 U Fan motor QFS-B0019MRE0... - Page 39 PARTS LIST Note: The parts marked “*” are used in voltage more than 250V. The parts marked "∆" may cause undue microwave exposure “§” MARK: SPARE PARTS-DELIVERY SECTION REF. NO. PART NO. § DESCRIPTION Q’TY CODE CONTROL PANEL PARTS CONTINUED VRD-B12EF472J U Resistor 4.7k ohm...
- Page 40 PARTS LIST Note: The parts marked “*” are used in voltage more than 250V. The parts marked "∆" may cause undue microwave exposure “§” MARK: SPARE PARTS-DELIVERY SECTION REF. NO. PART NO. § DESCRIPTION Q’TY CODE DOOR PARTS ∆ ∆ DDORFA752WRK0 U Door panel assembly ∆...
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Page 41: Exploded View Of Oven
EXPLODED VIEW OF OVEN CABINET AND UNIT CHASSIS PARTS 4-18 4-17 4-21 4-16 4-15 6-13 7-13 4-11 4-10 4-12 7-13 7-10 7-12 4-13 7-11 4-20 NOTE: In the event of removing the turntable motor cover this part should be refitted using screw connection: LX-EZA045WRE0(7-11) R-763 -... -
Page 42: Control Panel / Door Parts
CONTROL PANEL / DOOR PARTS 3 - 1 3-1E CONTROL PANEL PARTS 3-1F 3-1D 3 - 9 3 - 9 3 - 6 3 - 5 3 - 3 3 - 4 3 - 2 3 - 7 3 - 8 DOOR PARTS 5-10 R-763 -... -
Page 43: Miscelleneous / Packing And Accessories
MISCELLANEOUS/PACKING AND ACCESSORIES MISCELLANEOUS 6-11 6-10 Actual wire harness may be different than illustration. PACKING AND ACCESSORIES TOP PACKING CPADBA146WRK0 DOOR PROTECTION SHEET SPADPA020WRE0 POLYETHENE BAG SSAKHA041WRE0 MICROWAVE OVEN HIGH RACK INTO THE LOW RACK OVEN CAVITY (DIAGONALLY) COOK BOOK & INSTRUCTION BOOK TURNTABLE SUPPORT PACKING CASE... - Page 44 SHARP CORP 2000 Printed in UK R-763 -...