Sharp MMD24S, MMD24B manual Microwave Drawer Disassembly

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MICROWAVE DRAWER DISASSEMBLY

WARNING: Follow all safety precautions as stated at the beginning of this Service Manual before proceeding!

MMD24S

MMD24B

1.Before removing Microwave Drawer, take measures to protect the Drawer louver by either removing the louver or by letting the louver over hang off flat protected surface (Fig 1).

Fig. 1

2.Open the Drawer to access the 4 mounting screws holding the unit on to the wall or cabinet opening. (Fig 1).

3.Close Drawer and carefully pull the unit out from opening and unplug the power supply cord.

4.Remove top cover. (Fig 2).

5.Remove air cover from back of unit, then both side panels. (Fig 2).

Louver

screws

Top plate

6. Remove exhaust duct and back cover. (Fig 2).

Exhaust duct

Right side panel

Air cover

Back cover

Fig. 2

Cavity

Left side panel

NOTE: You now have access to various components for the Drawer.

Image 27

Contents MICROWAVE MEASUREMENT PROCEDURE TABLE OF CONTENTSWARNING TO SERVICE PERSONNEL WARNING TO SERVICE PERSONNELBEFORE SERVICING When the testing is completed WARNING TO SERVICE PERSONNELAfter repairing Before ServicingC. Leakage test MICROWAVE MEASUREMENT PROCEDUREB. Preparation for testing A. RequirementsIf provided, Vent Hood, Fan assembly, Cooling Fan Motor DANGER1440 Bridge Gate Dr Diamond Bar, CA SERVICE MANUALDESCRIPTION MICROWAVE DRAWER SPECIFICATIONGROUNDING INSTRUCTIONS GENERAL INFORMATIONOFF CONDITION POWER LEVEL P-0 TO P-90 COOKINGOPERATION DESCRIPTION OF OPERATING SEQUENCESENSOR COOKING CONDITION Cooking SequenceMICROWAVE SCHEMATIC OFF CONDITION CLOSED, COOK OFF CONDITTIONDOOR Before testing TEST PROCEDURESPROCEDURE A TOUCH CONTROL PANEL ASSEMBLY TESTCOMPONENT TEST B KEY UNIT TESTC RELAY TEST The rated AC voltage is not present between Check supply voltage and oven power cordDEFROST TEST STEPSTESTING 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 UNITH THERMAL CUT-OUT TEST Refer to the disassembly instructions found on PageG MAGNETRON ASSEMBLY TEST MICROWAVE OUTPUT POWERI SECONDARY INTERLOCK SWITCH TEST J STOP SWITCH TESTK MONITOR SWITCH TEST L BLOWN MONITOR FUSE TEST M POWER TRANSFORMER TEST5 Indicator Circuit TOUCH CONTROL PANEL ASSEMBLYControl Unit and Power Unit 4 Reset CircuitPower source voltage +5V DESCRIPTION OF LSI IC-1Power source voltage 0V GND Internal clock oscillation frequency setting inputSignal similar to P23 SignalSegment data signal Signal coming from touch keySignal to synchronize LSI with commercial power source frequency Magnetron high-voltage circuit driving signalCommon relay driving signal. Square Waveform 60Hz Signal to sound buzzer2 Operational Principle of Humidity Sensor HUMIDITY SENSOR CIRCUITventilation opening for sensing 1 Structure of Humidity Sensor2. Servicing of Touch Control Panel TOUCH CONTROL PANEL SERVICING1 Servicing the touch control panel with power supply of the oven 4. Other Precautions3. Soldering PRECAUTIONS FOR USING LEAD-FREE SOLDER2. Using lead-free wire solder 1. Employing lead-free solderTo prevent an electric shock, take the following pre- cautions COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREWARNING FOR WIRING WARNING AGAINST HIGH VOLTAGEMICROWAVE 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 TerminalAfter adjustment, check the following STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVALSTOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT Re-install1. Follow the Microwave Drawer disassembly as previously DRAWER ASSEMBLY AND CHOKE REMOVALDRAWER SUPPORT ANGLE REMOVAL DRAWER/SLIDE RAIL REMOVALActuator adjustment SWITCH ANGLE REMOVAL/ADJUSTMENTSWITCH ANGLE REMOVAL ACTUATOR REMOVAL/ADJUSTMENTInstallation AUTO DRAWER GEAR REMOVAL/INSTALLATIONBottom cover RACK GEAR REMOVALto Back Plate HIGH VOLTAGE COMPONENTSCN-A Figure S-2. Power Unit CircuitMICRO FM AF G H UNITCONTROL UNITFigure S-4. Printed Wiring Board of Power Unit 2.5AA B C D E F G H UnitControlof 5.PrintedWiringBoardCOPYRIGHT 2008 BY DACOR, INC ALL RIGHTS RESERVED