Touch Control Panel Servicing, Servicing Tools

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Sharp MMD24B, MMD24S Touch Control Panel Servicing, Servicing of Touch Control Panel, Servicing Tools, Other Precautions

Contents

TABLE OF CONTENTS WARNING TO SERVICE PERSONNELWARNING TO SERVICE PERSONNEL MICROWAVE MEASUREMENT PROCEDURE BEFORE SERVICING WARNING TO SERVICE PERSONNEL After repairingBefore Servicing When the testing is completed MICROWAVE MEASUREMENT PROCEDURE B. Preparation for testingA. Requirements C. Leakage test DANGER 1440 Bridge Gate Dr Diamond Bar, CASERVICE MANUAL If provided, Vent Hood, Fan assembly, Cooling Fan Motor MICROWAVE DRAWER SPECIFICATION DESCRIPTION GENERAL INFORMATION GROUNDING INSTRUCTIONS POWER LEVEL P-0 TO P-90 COOKING OPERATIONDESCRIPTION OF OPERATING SEQUENCE OFF CONDITION SENSOR COOKING CONDITION Cooking SequenceMICROWAVE SCHEMATIC OFF CONDITION CLOSED, COOK OFF CONDITTIONDOOR TEST PROCEDURES PROCEDUREA TOUCH CONTROL PANEL ASSEMBLY TEST Before testing COMPONENT TEST B KEY UNIT TESTC RELAY TEST Check supply voltage and oven power cord DEFROST TESTSTEPS The rated AC voltage is not present between TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT F AH SENSOR TEST Checking the initial sensor cooking conditionWater load cooking test CHECKING CONTROL UNIT R1, R2 22Ω ± 1% 1/2W R3 4.3kΩ ± 5% 1/4W R4 1MΩ ± 5% 1/4W Refer to the disassembly instructions found on Page G MAGNETRON ASSEMBLY TESTMICROWAVE OUTPUT POWER H THERMAL CUT-OUT TEST I SECONDARY INTERLOCK SWITCH TEST J STOP SWITCH TESTK MONITOR SWITCH TEST M POWER TRANSFORMER TEST L BLOWN MONITOR FUSE TEST TOUCH CONTROL PANEL ASSEMBLY Control Unit and Power Unit4 Reset Circuit 5 Indicator Circuit DESCRIPTION OF LSI IC-1 Power source voltage 0V GNDInternal clock oscillation frequency setting input Power source voltage +5V Signal Segment data signalSignal coming from touch key Signal similar to P23 Magnetron high-voltage circuit driving signal Common relay driving signal. Square Waveform 60HzSignal to sound buzzer Signal to synchronize LSI with commercial power source frequency HUMIDITY SENSOR CIRCUIT ventilation opening for sensing1 Structure of Humidity Sensor 2 Operational Principle of Humidity Sensor TOUCH CONTROL PANEL SERVICING 1 Servicing the touch control panel with power supply of the oven4. Other Precautions 2. Servicing of Touch Control Panel PRECAUTIONS FOR USING LEAD-FREE SOLDER 2. Using lead-free wire solder1. Employing lead-free solder 3. Soldering COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING FOR WIRINGWARNING AGAINST HIGH VOLTAGE To prevent an electric shock, take the following pre- cautions MICROWAVE DRAWER DISASSEMBLY POWER CORD REPLACEMENT Un-hook/Attach Black AC Wire to Top TerminalUn-hook/Attach White AC Wire to Bottom Terminal Un-hook/Attach Ground to metal Tab on Back Plate STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENTRe-install After adjustment, check the following DRAWER ASSEMBLY AND CHOKE REMOVAL DRAWER SUPPORT ANGLE REMOVALDRAWER/SLIDE RAIL REMOVAL 1. Follow the Microwave Drawer disassembly as previously SWITCH ANGLE REMOVAL/ADJUSTMENT SWITCH ANGLE REMOVALACTUATOR REMOVAL/ADJUSTMENT Actuator adjustment AUTO DRAWER GEAR REMOVAL/INSTALLATION Bottom coverRACK GEAR REMOVAL Installation HIGH VOLTAGE COMPONENTS to Back Plate Figure S-2. Power Unit Circuit MICROFM A CN-A UNIT CONTROLUNIT F G H Figure S-4. Printed Wiring Board of Power Unit 2.5AA B C D E F G H 5.PrintedWiringBoard UnitControlof COPYRIGHT 2008 BY DACOR, INC ALL RIGHTS RESERVED

Sharp MMD24B Touch Control Panel Servicing, Servicing of Touch Control Panel, Servicing Tools

Models: MMD24S MMD24B