Sharp MMD24B, MMD24S manual Schematic Off Condition, Closed, Cook Off Condittion, Door

Page 10

SCHEMATIC (OFF CONDITION)

MMD24S

MMD24B

SCHEMATIC (OFF CONDITION)

	MAGNETRON		H.V. RECTIFIER
			H.V. RECTIFIER
				CAPACITOR
				xxx µF
				AC 2300V
THIRDDOOR SWITCH YLWor YLWor	POWER TRANSFORMER			GRY
THIRDDOOR SWITCH YLWor YLWor	N.O.COM			GRY
RED
		COM	N.C.			WHT
		COM	N.C.			WHT
ORG BLK	RED or BLK	MONITOR SWITCH		N.O.	BLU		DOOR POSITION SWITCH REAR
ORG BLK	BRN				M5	GRN	DOOR POSITION SWITCH REAR
	BRN

				GRN	DOOR POSITION FRONT
RED or BLK	B1		M4	GRN*2	DOOR POSITION FRONT
			GRY	GRN
			M1	GRN	DOOR SENSING SWITCH
			M1	GRN	DOOR SENSING SWITCH
	GRY	PRIMARY INTERLOCK RELAY	WHT	GRN
		PRIMARY INTERLOCK RELAY

SWITCH
INTERLOCK	BLK
	YLWor
SECONDARY	BRN
SECONDARY	BLK
	ORG

STIRRER MOTOR	COM

ORG or				SM	BLU			A1
ORG or					BLU			A1
	YLW
		FAN MOTOR
N.O.	RED			FM	GRY			A3
	RED		*2		GRY
		or
		BLK *2
COM		OVEN LAMP						N.O.
COM				OL				N.O.
	RED *2			OL	WHT			WHT
	RED *2			BLK *2	WHT			WHT
	or			BLK *2				GRY
							F3
						F2
			HUMDITY					F1
			HUMDITY
			SENSOR

	RY2						M3	GRN
	RY2						N5	BLK
					UNIT		N5	BLK
	RY3				UNIT		N4	YLW
							N4	YLW
					CONTROL		N3	BLU
							N3	BLU
							N2	DM
								DM

	RY4						N1	ORG
							RED
	RY1						COM
LOWVOLTAGE TRANSFORMER	RY1
LOWVOLTAGE TRANSFORMER					RY5
					RY5
A7	A5	H11			E3	E1	H9
			RED			BLK RED	CN502
		CN502		2		BLK RED	CN502
					CN502		3
					1
RED	WHT		GRN			SWITCHING REGULATOR
RED	WHT		CN501		1	SWITCHING REGULATOR
		GRY

MOTOR

DOOR OPEN-CLOSE

MICROWAVE DRAWER

WHT

WHT

MICROWAVE DRAWER

backview

toHotwire(RED)

CLOSED, COOK OFF CONDITTION)

THERMAL
OVEN	OUTCUT-
THERMAL CUT
MAG	OUT-

ORG	RED	BLK	BLK	CN501 3
	or
ORG					WHT
					GRY
RED		"TO LOAD"			"TO LOAD"
					"TO LOAD"

			0.0033 µF 250V		0.0033 µF 250V
			LINE BYPASS CAPACITOR		LINE BYPASS CAPACITOR
			NOISE SUPRESSION COIL
			LINE CROSS CAPACITOR 1.0 µF 275V
FUSE			RESISTOR 470 k Ω 1/2W
20A
L

NOISE FILTER

GRY

WHT

N

/WireColorssubjecttochangewithoutnotice.	ontherightsideonlampsocket's neutralwire.
	to
	locatedis
	connected
	that
	be sensor.humidityuteabsoltheusemodelscertain connectedbemustterminalLead)(FinishTransformer

(DOOR

"TO SOURCE"		GRN	GND		"TO SOURCE"
"TO SOURCE"					"TO SOURCE"
	BLK	H		N	WHT

NOTES:	1.Circuits	must	3.Only 4.Power
		Terminal2.

10

Image 10

Contents WARNING TO SERVICE PERSONNEL TABLE OF CONTENTSWARNING TO SERVICE PERSONNEL MICROWAVE MEASUREMENT PROCEDUREBEFORE SERVICING Before Servicing WARNING TO SERVICE PERSONNELAfter repairing When the testing is completedA. Requirements MICROWAVE MEASUREMENT PROCEDUREB. Preparation for testing C. Leakage testSERVICE MANUAL DANGER1440 Bridge Gate Dr Diamond Bar, CA If provided, Vent Hood, Fan assembly, Cooling Fan MotorMICROWAVE DRAWER SPECIFICATION DESCRIPTIONGENERAL INFORMATION GROUNDING INSTRUCTIONSDESCRIPTION OF OPERATING SEQUENCE POWER LEVEL P-0 TO P-90 COOKINGOPERATION OFF CONDITIONCooking Sequence SENSOR COOKING CONDITIONMICROWAVE CLOSED, COOK OFF CONDITTION SCHEMATIC OFF CONDITIONDOOR A TOUCH CONTROL PANEL ASSEMBLY TEST TEST PROCEDURESPROCEDURE Before testingB KEY UNIT TEST COMPONENT TESTC RELAY TEST STEPS Check supply voltage and oven power cordDEFROST TEST The rated AC voltage is not present betweenF AH SENSOR TEST Checking the initial sensor cooking condition TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNITWater load cooking test CHECKING CONTROL UNIT R1, R2 22Ω ± 1% 1/2W R3 4.3kΩ ± 5% 1/4W R4 1MΩ ± 5% 1/4WMICROWAVE OUTPUT POWER Refer to the disassembly instructions found on PageG MAGNETRON ASSEMBLY TEST H THERMAL CUT-OUT TESTJ STOP SWITCH TEST I SECONDARY INTERLOCK SWITCH TESTK MONITOR SWITCH TEST M POWER TRANSFORMER TEST L BLOWN MONITOR FUSE TEST4 Reset Circuit TOUCH CONTROL PANEL ASSEMBLYControl Unit and Power Unit 5 Indicator CircuitInternal clock oscillation frequency setting input DESCRIPTION OF LSI IC-1Power source voltage 0V GND Power source voltage +5VSignal coming from touch key SignalSegment data signal Signal similar to P23Signal to sound buzzer Magnetron high-voltage circuit driving signalCommon relay driving signal. Square Waveform 60Hz Signal to synchronize LSI with commercial power source frequency1 Structure of Humidity Sensor HUMIDITY SENSOR CIRCUITventilation opening for sensing 2 Operational Principle of Humidity Sensor4. Other Precautions TOUCH CONTROL PANEL SERVICING1 Servicing the touch control panel with power supply of the oven 2. Servicing of Touch Control Panel1. Employing lead-free solder PRECAUTIONS FOR USING LEAD-FREE SOLDER2. Using lead-free wire solder 3. SolderingWARNING AGAINST HIGH VOLTAGE COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREWARNING FOR WIRING To prevent an electric shock, take the following pre- cautionsMICROWAVE DRAWER DISASSEMBLY Un-hook/Attach White AC Wire to Bottom Terminal POWER CORD REPLACEMENTUn-hook/Attach Black AC Wire to Top Terminal Un-hook/Attach Ground to metal Tab on Back PlateRe-install STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVALSTOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT After adjustment, check the followingDRAWER/SLIDE RAIL REMOVAL DRAWER ASSEMBLY AND CHOKE REMOVALDRAWER SUPPORT ANGLE REMOVAL 1. Follow the Microwave Drawer disassembly as previouslyACTUATOR REMOVAL/ADJUSTMENT SWITCH ANGLE REMOVAL/ADJUSTMENTSWITCH ANGLE REMOVAL Actuator adjustmentRACK GEAR REMOVAL AUTO DRAWER GEAR REMOVAL/INSTALLATIONBottom cover InstallationHIGH VOLTAGE COMPONENTS to Back PlateFM A Figure S-2. Power Unit CircuitMICRO CN-AUNIT UNITCONTROL F G H2.5A Figure S-4. Printed Wiring Board of Power UnitA B C D E F G H 5.PrintedWiringBoard UnitControlofCOPYRIGHT 2008 BY DACOR, INC ALL RIGHTS RESERVED