SHARP SERVICE MANUAL S9706R8580J// CONVECTION MICROWAVE TAME OF OVEN CONTENTS Page PRECAUTIONS .......................................................................................................... INSIDE FRONT COVER FOREWORD ....................................................................................................................................................... I THUMB INDEX .............................................................................................................
R -8680 SERVICE MANUAL SHARP CONVECTION PRODUCT MICROWAVE OVEN R-8580 FOREWORD This Manual has been prepared to provide Sharp Corp. Service Personnel with complete Operation and Service Information for the SHARP CONVECTION MICROWAVE oven, R-8580. It is recommended that service personnel carefully entire text of this manual so they will be qualified satisfactory customer service. study the to render Check interlock switches and door seal carefully.
R-8580 PRODUCT DESCRIPTION SPECIFICATION DESCRIPTION ITEM Power Requirements 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 14OOW (Microwave) 1600W (Convection) Power Output 700 watts normal of RF microwave Operating frequency of 2450M Hz Convection 1.
R-8580 Auto-TouchTM Control Panel Touch to select sensor cook Touch to select Compu Cook mode ,&&:::C::P: 123 4 567690- Fresh vegetables Frozen vegetables Baked potatoes Frozen dinners Bacon Chicken preces Fish fillets Rice 8 Pasta Cake Reheat .
OPERATION DESCRIPTION The following is a description during oven operation. of component OF OPERATING functions (RD71101 U) OFF CONDITION activates both door interlock Closing the door switches: upper latch switch, lower latch switch and (In this condition, the monitor switch stop switch. contacts are opened.) When oven is plugged in, 240 volts A.C. is supplied to the relay unit. (Figure O-l). ’ 1. The display will show flashing “88:88”.
R -8580 CONVECTION COOKING CONDITION PREHEATING CONDITION Program desired convection temperature by touching the CONVECTION pad and the temp. pad. When the START pad is touched, the following operations occur: 1. The coil of shut-off relays (RY2, RY3 and RY5) are energized, the oven lamp, cooling fan motor, turntable motor and convection motor are turned 2. 3. 4. y:k coil of relay (RY6) is energized by the CPU unit, The damper is moved to the closed position, opening the damper switch contacts.
R-8580 Note: During alternate Microwave/Convection operation, the convection heater is energized only if the cavity temperature drops below the set temperature. 2. 3. SENSOR COOKING 4. CONDITION Using the SENSOR COOK function, the foods are cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results.
240V-50Hz G-4 MBA MONITOR OVEN RESISTOR O.B/2OW MON,TOR TEMP. FUSE 142’C SW,TCH MONITOR RESISTOR D.B/2DW MONITOR I TEMP. FUSE 142’C SWITCH I, LAMP OVEN LAMP n FAN MOTOR AC CORD CONNECTION BRN BROWN BLU : BLUE G-Y GREEN AND YELLOW STRIPE : SECTIONAL AREA OF l.Omm’ MIN. I17 I i AC CORD CONNECTION RELAY-UNIT -______ A-3 BRN BROWN BLU BLUE G-Y GREEN AND YELLOW STRIPE /I7 SECTIONAL OF l.
R-8580 240V-50Hz MONITOR RESISTOR 0.8/20W MONITOR I TEMP. FUSE 142°C SWITCH a//o OVEN LAMP FAN MOTOR I AC CORD CONNECTION BRN : BROWN BLU : BLUE G-Y : GREEN AND YELLOW 117 : SECTIONAL OF l.Omm’ STRIPE AREA MIN. UPPER LATCH SWITCH LOWER LATCH SWITCH SCHEMATIC NC 4 I NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CONVECTION PAD TOUCHED 3. DESIRED TEMP. PAD TOUCHED 4. START PAD TOUCHED B CON”ECTlON%ATER POWER 1 RECTIFIER j I TRANSFORMER CAPACITOR 1.
R -8580 DESCRIPTION AND FUNCTION THERMISTOR The thermistor is a negative temperature coefficient type. The temperature in the oven cavity is detected through the resistance of the thermistor, and then the CPU unit causes the heater relay to operate, thus the current to the convection heater is turned ON/OFF.
R-8580 CONVECTION The convection It oven cavity. convection fan. force-circulated HEATER heater is located at the left side of the is intended to heat air driven by the The heated air is kept in the oven and and reheated by the convection heater. Microwave Cooking: Damper is in the open position, because a portion of cooling air is channeled through the cavity to remove steam and vapors given off from the heating foods. It is then exhausted at the top of the oven cavity into a condensation compartment.
SERVICING TROUBLESHOOTING When troubleshooting the microwave oven, it is helpfull 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.
R -8580 PROBLEM POSSIBLE COOKING Oven lamp does not light in cook cycle. (Does light when door is opened) Oven lamp does not light at all. Oven lamp lights, but motor does not operate. turntable Turntable motor operates normally but cooling fan motor does not operate CAUSE TEST PROCEDURE CORRECTION CONDITION Defective unit. shut-off Defective CPU unit. relay (RY2) on relay Procedure N. Procedure 0. Burned out bulb. Replace Open wiring Check and repair wiring of oven lamp.
R -8580 POSSIBLE PROBLEM CAUSE TEST PROCEDURE CORRECTION CONVECTION rCONV does when indicator light but oven not go into a cook cycle START pad is touched. Defective heater relay(RY4) is Lower than preset temperature. Cooling fan motor, turntable tor and oven lamp intermitantly or all the time. key unit. Procedure P. thermistor. procedure K. in circuit Convection cycle then shuts down. runs 3 minutes to above Defective convection Defective heater relay(RY4) Defective CPU unit.
R-8580 TEST PROCEDURES PROCEDURE LETTER COMPONENT MAGNETRON DISCHARGE THE HIGH NENTS OR WIRING. VOLTAGE TEST ASSEMBLY CAPACITOR TEST BEFORE TOUCHING ANY OVEN COMPO- To test for an open filament, isolate the magnetron from the high voltage circuit. check across the magnetron filament leads should indicate less than 1 ohm. A continuity To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.
R-8680 TEST PROCEDURES PROCEDURE LETTER (CONT’D) COMPONENT 3. Water mately 4. Room 5. Power TEST container should be one (1) litre beaker made of Pyrex glass and its diameter approxi12 cm. temperature should be around 20 “C. supply voltage should be specification voltage. POWER DISCHARGE THE HIGH NENTS OR WIRING. VOLTAGE TRANSFORMER CAPACITOR TEST BEFORE TOUCHING ANY Disconnect the primary input terminals and measure the resistance of the ohmmeter.
R-8580 TEST PROCEDURES PROCEDURE LETTER (CONT’D) COMPONENT MONITOR TEST SWITCH TEST Before performing this test, disconnect oven from power supply and make sure that the upper latch switch is operating properly referring to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (NC) terminal. Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit.
R -8580 TEST PROCEDURE LETTER PROCEDURES \ (CONT’D) COMPONENT CONVECTION TEST HEATER TEST Make sure the convection heater is fully cooled and test as follows; a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the resistance between the convection heater terminals should be approximately 38 ohms. b. Disconnect wire leads and measure the insulation resistance with 500V - IOOM R insulation resistance meter.
R-8580 TEST PROCEDURES PROCEDURE LETTER (CONT’O) COMPONENT RELAY N TEST UNIT TEST The relay unit consists of circuits including the shut-off relays, buzzer, transformer, etc. Plug power cord into wall receptacle “88:88” will be flashing in the display. Remove the outer case and check voltage between Pin Nos. 1 and 3 of the 6-pin connector on the relay unit with an A.C. voltmeter. The meter should indicate 240 volts, if not check oven circuit.
TEST PROCEDURES PROCEDURE LETTER (CONT’O) COMPONENT TOUCH CONTROL TEST 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 In this service manual, the touch control panel assembly is dionly a voltmeter and ohmmeter.
TEST PROCEDURES PROCEDURE LETTER (CONT’O) COMPONENT AH SENSOR 0 TEST TEST Checking the initial sensor cooking condition (1) The oven should be plugged in at least five minutes befor sensor cooking. (2) Room temperature should not exceed 35 “C. (3) The unit should not be installed in any area where heart and steam are generated. The unit should not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION Instruction”.
R-8580 TEST PROCEDURES PROCEDURE LETTER (CONT’D) COMPONENT CHECKING (1) (2) (3) (4) (5) (6) TEST CONTROL UNIT Disconnect oven from power supply and remove outer case. Discharge the high voltage capacitor. Disconnect the wire leads from the cook relay. Disconnect the sensor connector that is mounted to lower position of control panel. Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
R-8580 TOUCH CONTROL OUTLINE PANEL ASSEMBLY OF TOUCH 3) The touch control section consists of the following units as shown in the touch control panel circuit. (1) Relay Unit (2) Key Unit (3) Control Unit The principal functions of these units and the signals communicated among them are explained below. (RD911 Relay Unit Relay unit consists of six relays source circuit and buzzer circuit.
DESCRIPTION LSI( IZA096DR) The I/O signal of the LSI(IZA096DR) is detailed OF LSJ in the following table. (RD93101 U) I PIN NO. Digit selection signal. Refer to the touch control Normally, 1 SIGNAL l-6 panel circuit one pulse is output ) EO-E5 about the relation in every synchronized signal I between I/O / OUT signals and digits. period, and input to the grid of the fluorescent disrla[. (RDS PIN NO. Segment data signals. Refer to the touch control Normally, PIN NO.
R-8580 PIN NO. 1 SIGNAL 15 I I/O / El4 j OUT Segment data signal. Signal similar to E6. PIN NO. 1 SIGNAL / 16 Seqment data siqnal. Signal similar to E6. Kev strobe siqnal. Signal applied to touch-key section. A pulse signal is input to AN4-AN7 terminal PINNO. 1 SIGNAL I17 Segment data siqnal. Signal similar to E6. Kev strobe siqnal. -Signal applied to touch-key section. A pulse signal is input to AN4-AN7 terminal PIN NO. Seqment data siqnal. Signal similar to E6. Kev strobe siqnal.
R -8580 PIN NO. Used for initial PIN NO. 1 SIGNAL 1 29 balancing of the bridge circuit(absolute 1 SIGNAL / 30 I I/O j SI E25 himidity sensor). I I/O / E26 Signal to sound buzzer. A: Key touch sound.(O.l sec.) B: Completion sound.(2.0 sec.) C: When the temperature of the oven cavity reaches the preset temperature preheating hold time (15 minutes) is elapsed. (I .O sec. ON-l .O sec. OFF repeat) PIN NO.
R -8580 PIN .NO. / 38 1 SIGNAL I I/O / R5 j OUT Damper motor relav driving signal. To turn on and off the damper motor relay. PIN NO. 1 SIGNAL 1 39 I l/O / R6 (RD93466UI 1 OUT Digit selection signal. Signal similar to EO. PIN NO. 1 SIGNAL j 40 Input signal which communicates Damper opened; “H” level signal. Damper closed; “1” level signal. PIN NO. the damper 1 SIGNAL 1 41 I I/O 1 R7 open/close information 1 E37 1 (RD938A2U) / IN to LSI. .
1 SIGNAL / AN3 / IN PIN NO. / 51 I/O I Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an analog input terminal from the AH sensor circuit,and connected to the A/D converter built into the (RD936A3U) PIN NO. SIGNAL ( 52 AH sensor inuut. This input is an analog input terminal LSI. / AN2 from the AH sensor circuit, I and connected I/O IN to the A/D converter built into the (RD936A2U) PIN NO.
R-8580 ABSOLUTE HUMIDITY (1) Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration. One thermister is housed in the closed vessel filled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow. (2) Operational Principle of Absolute Humidity Sensor The figure below shows the basic structure of an absolute humidity sensor.
R -8580 SERVICING 1. Precautions Components for Handing For those models, therefore, check and repair all the controls (with the sensor-related ones included) of the touch control panel while keeping it in contact with the oven proper. B. On some models, on the other hand, the power supply cord between the touch control panel and the oven proper is so long that they may be separated from each other.
R -8580 COMPONENT REPLACEMENT AND WARNING: To avoid possible exposure to microwave energy; A. Before operating the oven 1. Make sure that unlatching the door slowly is accompanied by a click indicating actuation of the monitor switch and latch switches. 2. Check visually the door seal for arcing and damage. B. Do not operate the oven until after repair if any of conditions exist; the following 1. Door does not close firmly against the front of appliance. 2. There iS a broken door hinge or support. 3.
MAGNETRON oven from power supply and remove 1. Disconnect outer case. 2. Discharge the high voltage capacitor. 3. Disconnect wire leads from the magnetron. Remove the magnetron temp. fuse fitted to waveguide flange. And release the wire leads from the hole of magnetron cooling duct (B). And release the AH sensor harness from hole of chassis Remove four (4) screws holding the support. chassis support to cooling duct (A), waveguide, rear cabinet, control back plate. 4.
R -8580 DAMPER ASSEMBlY 1. Disconnect oven from power supply and remove outer case. 2. Discharge the high voltage capacitor. 3. Disconnect wire leads from damper motor and damper switch. 4. Do above the MAGNETRON REMOVAL from No.3 to No.6. 5. Remove one (1) screw holding the magnetron air guide to waveguide flange. 6. Remove the magnetron air guide. CONVECTION I. 2. 3. 4. 5. 6. 7. REMOVAL 7. Raise the stopper of the damper shaft, and pull out the damper shaft. 8.
CONTROL PANEL ASSEMBLY AND CPU UNIT REMOVAL Replacement The complete control panel should be removed for replacement of components except the relay unit. To remove the control panel, proceed as follows: 1, Disconnect oven from power supply and remove outer case. 2. Discharge the high voltage capacitor. 3. Disconnect the wire connectors and wire leads from the relay unit and CPU unit. 4. Disconnect a connector from the CPU unit. 5.
R -8580 DOOR REPLACEMENT DOOR ADJUSTMENT When removing and/or loosening hinges such as in the case of a door replacement, the following adjustment criteria are taken. Door is adjusted to meet the following three conditions before tightening the binge screws. DOOR REPLACEMENT 1. Disconnect oven from power supply and remove outer case. 2. Holding the door, remove three (3) screws securing the upper door hinge to the oven cavity. The door assembly is nowfree from the oven cavity. 3.
R -8580 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.
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R -8580 1 2 4 3 5 6.
R -8580 2 1 3 4 5 6 1 5 2 t 0 L. T.TM I F M. I CONV M I (dir SW -* P0Wef.q OAMPM I Relay Unit Control Unit Figure S-3.
PARTS Note : LIST The voltage supplied to the parts ‘I*” are greater than 250V. * REF. NO. Refer to “REPLACEMENT 1 PART NO. PARTS LIST” described at after PARTS LIST. DESCRIPTION I ELECTRICAL l- 1 l- 2 ;I ; l- 5 l- 6 l- 7 l- 8 l- 9 l-10 l-11 l-12 l-13 l-14 l-15 l-16 l-17 l-18 l-19 l-20 l-21 l-22 l-23 l-24 2- 1 Power supply cord Monitor switch Fuse holder Magnetron temp.
R -8580 Note : The voltage supplied * REF. NO. to the parts RI,, are greater than 25OV. Refer to “REPLACEMENT PART PARTS LIST” described at after PARTS LIST. NO. DESCRIPTION C6 c9 Cl0 c30 c50 RC-EZA059DREO RC-EZA057DREO RC-EZA058DREO RC-EZAOGODREO RC-KZ104QDREO Capacitor Capacitor Capacitor Capacitor Capacitor C80 C81 CFl Dl-D5, D8-DlO RC-EZA063DREO RC-EZA062DREO RCRS-A003DREO RH-DZA029DREO Capacitor 0.47 PF Capacitor 3.3 PF Ceramic filter(4.
R-8580 Note : The *I REF. NO. oltage supplied to the parts ,,*” are greater than 250V. ?fer to “REPLACEMENT PART PARTS LIST” described at after PARTS LIST. RH-VZA009DREO HPNLCA378WRJO GMADIA031WRRO DUNTKA184WREO LANGTA046WRWO Varistor 14DK471J Control panel frame Display filter Key unit Key unit angle 3- 7 3- 8 LCHSMA022WRWO XCTSD40P12000 3- 9 3-10 XHPSD30P12XSO LX-BZ0198WREO Control panel back plate Screw; Key unit angle and control back plate mtg. Screw; cpu unit mtg. Screw; relay unit mtg.
R -8580 The voltage supplied Note * REF. NO. to the parts n*w are greater than 250V. Refer to “REPLACEMENT PART PARTS LIST” described at after PARTS LIST. NO.
R -8580 Note : The voltage * REF. NO. supplied to the parts “*,, are greater than 250V.
R -8580 REPLACEMENT PARTS LIST This replacement parts list shows interchangeability of marked ( * ) parts on the control panel parts to the alterations of product locations. This list has been prepared to show LISTED PART NO. along with the USED PART NO. side by side. (RDQI 101 U) NOTE : Common resistors have been omited from this parts list, such as 1/4W patibility list and cross referrence information.
R-8580 - 1 2 3 4 I! 6 5 - A x 9 a BI C -1 D E F 1 2 4 3 45 , I , 5 6
R-8580 3 2 1 CONTROL PANEL 4 PARTS \\ Iri 0 p 1, * 8 II iP I 1 5 3-r 9 3-2 ‘Y \‘\ k4 4 J/I I” //’ DOOR ASSEMBLY MISCELLANEOUS 6-3 6- I Trans.
R-8580 1 4 3 2 6 5 \ I , PACKING AND I ACCESSORIES [TRAY PACKING FOAM a (SPADP0328WREO) WI Not Redaceble Item L / 1 2 I 3 4 47 5 6
R -8580 48
R -8580 49
R -8580 (RDXI 101 U) SHARP ‘87 0 SHARP CORP. (9U0.