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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 PROCEDURE ................................................................................................................................. 10
TOUCH CONTROL ASSEMBLY .............................................................................................................. 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................... 22
TEST DATA AT A GLANCE ..................................................................................................................... 26
MICROWAVE MEASUREMENT .............................................................................................................. 27
SCHEMATIC DIAGRAMS ......................................................................................................................... 28
PICTORIAL DIAGRAM ............................................................................................................................. 30
CONTROL PANEL CIRCUIT .................................................................................................................... 31
PRINTED WIRING BOARD DIAGRAM ................................................................................................... 32
PARTS LIST ............................................................................................................................................. 33
EXPLODED VIEW OF OVEN .................................................................................................................... 36
CONTROL PANEL /DOOR PARTS ...........................................................................................................37
MISCELLANEOUS/PACKING AND ACCESSORIES ................................................................................ 38
SERVICE MANUAL
R
COOK & DEFROST
COOK & DEFR
OST
KG
R-733
R-733(W/B)
R-733(Y/LB/LG/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.
TABLE OF CONTENTS
SHARP CORPORATION
S04273R733EHW
GRILL AND
MICROWAVE OVEN
MODELS
Page
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Summary of Contents for Sharp R-733W
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Page 1: Table Of Contents
SCHEMATIC DIAGRAMS ......................... 28 PICTORIAL DIAGRAM ..........................30 CONTROL PANEL CIRCUIT ........................31 PRINTED WIRING BOARD DIAGRAM ....................32 PARTS LIST ............................. 33 EXPLODED VIEW OF OVEN ........................36 CONTROL PANEL /DOOR PARTS ......................37 MISCELLANEOUS/PACKING AND ACCESSORIES ................38 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-733(W/B)/ 733(W/Y/LB/LG/)F 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 1.52 kW Approx. 7.1 A Grill cooking 1.25 kW Approx. 5.3 A Dual cooking 2.7 kW Approx. 12.4 A Power Output 900W watts nominal of RF microwave energy (measured by way of IEC 705) Operating frequency of 2450 MHz Grill Heating Element Power Output... -
Page 8: Appearance View
APPEARANCE VIEW OVEN Door Door hinges Grill Guide Lamp filter Waveguide cover Contol panel Coupling Door open button Door latches 10. Oven cavity 11. Safety door latches 12. Ventilation openings 13. Outer case 14. Rear back plate 15. Power supply cord 1. -
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 1. The contact of monitored latch switch SW1 are closed. In this condition the food is cooked by grill heater energy. 2. The relay RY1, RY2 and RY3 are energized. Program desired cooking time and grill mode using MODE 3. - Page 11 FUNCTION OF IMPORTANT COMPONENTS FUSE F1 F8A 250V NOISE FILTER The noise filter prevents any 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 Procedure
TEST PROCEDURES TEST PROCEDURE A B C D E E E F F F G H I K K L M O O O P 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 HIGH VOLTAGE RECTIFIER CARRY OUT 3D CHECKS. 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 can not be performed with only a voltmeter and ohmmeter.
- Page 19 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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.
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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 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 (Grill or dual) or 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...
- 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 1. CARRY OUT 3D CHECKS. MONITOR SWITCH(SW2) 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 MONITORED LATCH SWITCH (SW1) oven cavity.
- Page 27 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE POWER SUPPLY CORD REPLACEMENT Re-install Removal 1. Insert the moulding cord stopper of power supply cord 1. CARRY OUT 3D CHECKS. into the square hole of the rear cabinet, referring to the 2. Remove the single (1) screw holding the green/yellow Figure C-5 (b).
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Page 28: Test Data At A Glance
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE screws. air-tight, moisture (condensation)-tight or light-tight. 6. Located door panel hinge pins into cavity hinge location Therefore, occasional appearance of moisture, holes. light or sensing of gentle warm air movement 7. Re-install choke cover to door panel by clipping into around oven door is not abnormal and do not of position. -
Page 29: Microwave Measurement
MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch and Recommended instruments are: door are completed individually or collectively, the following NARDA 8100 leakage test must be performed with a survey instrument NARDA 8200 and it must be confirmed that the result meets the HOLADAY HI 1500 requirements of the performance standard for microwave SIMPSON 380M... -
Page 30: 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-733 -... - Page 31 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-733 -...
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Page 32: Pictorial Diagram
POWER SUPPLY CORD LIVE NEUTRAL GRILL HEATER EARTH CONTROL PANEL CN-B TC2: OVEN 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 BLU RED TTM: TURNTABLE C: HV CAPACITOR MOTOR... - Page 33 WH-1 LIQUID CRYSTAL DISPLAY 11ES1·4 LD1 LD2 LD3 LD4 WH-2 DTA123ES D2 D4 AC230V – – 50Hz B1238 KRA101M R60 4.7k KRA101M SEG21 SEG 8 SEG22 50 SEG 7 SEG23 49 SEG 6 OVEN LAMP KRC243M COM1 48 SEG 5 FAN MOTOR –...
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Page 34: 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-733 -... -
Page 35: 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 § Q’TY CODE REF. NO. PART NO. DESCRIPTION ELECTRIC PARTS RC-QZA252WRE0 U High voltage capacitor RMOTEA361WRE0 U Fan motor QFS-B0019MRE0... - Page 36 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 CONTIN..VRD-RM2HD910J U Resistor 91k ohm...
- Page 37 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 PART NO. § Q’TY CODE REF. NO. DESCRIPTION OVEN PARTS DOVN-A007URKO U Oven cavity LBNDKA107WRP1 U Capacitor holder PHOK-A078WRF5...
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Page 38: Exploded View Of Oven
EXPLODED VIEW OF OVEN CABINET AND UNIT CHASSIS PARTS 4-18 4-17 4-16 4-15 6-13 4-11 4-10 4-12 7-10 4-13 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-733 -... -
Page 39: Control Panel /Door Parts
CONTROL PANEL / DOOR PARTS 3 - 1 3-1E 3-1F CONTROL PANEL PARTS 3-1D 3 - 2 3-11 3 - 3 3 - 4 3-10 3 - 8 3 - 6 3 - 5 3 - 7 3 - 9 DOOR PARTS 5-10 R-733 -... -
Page 40: Miscellaneous/Packing And Accessories
COOK BOOK & INSTRUCTION BOOK TURNTABLE SUPPORT TRAY PAD PACKING CASE (SPAKCA369URR0) R-733 (W) (SPAKCA370URR0) R-733 (B) Not Replaceable Items. (SPAKCA390URR0) R-733 (Y)F (SPAKCA368URR0) R-733 (W)F (SPAKCA388URR0) R-733 (LB)F (SPAKCA389URR0) R-733 (LG)F SHARP CORP 2000 Printed in the U.K. R-733 -...