Test Procedures, Component Test, Letter

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Contents

MICROWAVE MEASUREMENT PROCEDURE TABLE OF CONTENTSWARNING TO SERVICE PERSONNEL WARNING TO SERVICE PERSONNEL BEFORE SERVICING When the testing is completed WARNING TO SERVICE PERSONNELAfter repairing Before Servicing C. Leakage test MICROWAVE MEASUREMENT PROCEDUREB. Preparation for testing A. Requirements If provided, Vent Hood, Fan assembly, Cooling Fan Motor DANGER1440 Bridge Gate Dr Diamond Bar, CA SERVICE MANUAL DESCRIPTION MICROWAVE DRAWER SPECIFICATION GROUNDING INSTRUCTIONS GENERAL INFORMATION OFF CONDITION POWER LEVEL P-0 TO P-90 COOKINGOPERATION DESCRIPTION OF OPERATING SEQUENCE SENSOR COOKING CONDITION Cooking SequenceMICROWAVE SCHEMATIC OFF CONDITION CLOSED, COOK OFF CONDITTIONDOOR Before testing TEST PROCEDURESPROCEDURE A TOUCH CONTROL PANEL ASSEMBLY TEST COMPONENT TEST B KEY UNIT TESTC RELAY TEST The rated AC voltage is not present between Check supply voltage and oven power cordDEFROST TEST STEPS TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT F AH SENSOR TEST Checking the initial sensor cooking conditionWater load cooking test R1, R2 22Ω ± 1% 1/2W R3 4.3kΩ ± 5% 1/4W R4 1MΩ ± 5% 1/4W CHECKING CONTROL UNIT H THERMAL CUT-OUT TEST Refer to the disassembly instructions found on PageG MAGNETRON ASSEMBLY TEST MICROWAVE OUTPUT POWER I SECONDARY INTERLOCK SWITCH TEST J STOP SWITCH TESTK MONITOR SWITCH TEST L BLOWN MONITOR FUSE TEST M POWER TRANSFORMER TEST 5 Indicator Circuit TOUCH CONTROL PANEL ASSEMBLYControl Unit and Power Unit 4 Reset Circuit Power source voltage +5V DESCRIPTION OF LSI IC-1Power source voltage 0V GND Internal clock oscillation frequency setting input Signal similar to P23 SignalSegment data signal Signal coming from touch key Signal to synchronize LSI with commercial power source frequency Magnetron high-voltage circuit driving signalCommon relay driving signal. Square Waveform 60Hz Signal to sound buzzer 2 Operational Principle of Humidity Sensor HUMIDITY SENSOR CIRCUITventilation opening for sensing 1 Structure of Humidity Sensor 2. Servicing of Touch Control Panel TOUCH CONTROL PANEL SERVICING1 Servicing the touch control panel with power supply of the oven 4. Other Precautions 3. Soldering PRECAUTIONS FOR USING LEAD-FREE SOLDER2. Using lead-free wire solder 1. Employing lead-free solder To prevent an electric shock, take the following pre- cautions COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREWARNING FOR WIRING WARNING AGAINST HIGH VOLTAGE MICROWAVE DRAWER DISASSEMBLY Un-hook/Attach Ground to metal Tab on Back Plate POWER CORD REPLACEMENTUn-hook/Attach Black AC Wire to Top Terminal Un-hook/Attach White AC Wire to Bottom Terminal After adjustment, check the following STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVALSTOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT Re-install 1. Follow the Microwave Drawer disassembly as previously DRAWER ASSEMBLY AND CHOKE REMOVALDRAWER SUPPORT ANGLE REMOVAL DRAWER/SLIDE RAIL REMOVAL Actuator adjustment SWITCH ANGLE REMOVAL/ADJUSTMENTSWITCH ANGLE REMOVAL ACTUATOR REMOVAL/ADJUSTMENT Installation AUTO DRAWER GEAR REMOVAL/INSTALLATIONBottom cover RACK GEAR REMOVAL to Back Plate HIGH VOLTAGE COMPONENTS CN-A Figure S-2. Power Unit CircuitMICRO FM A F G H UNITCONTROL UNIT Figure S-4. Printed Wiring Board of Power Unit 2.5AA B C D E F G H UnitControlof 5.PrintedWiringBoard COPYRIGHT 2008 BY DACOR, INC ALL RIGHTS RESERVED

Sharp MMD24S, MMD24B manual Test Procedures, Component Test, Letter, Checking Control Unit

Models: MMD24S MMD24B