Goldstar MA-2005ST service manual Relay

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	COMPONENTS	TEST PROCEDURE							RESULTS
	RELAY 2	Check for continuity of relay 2 with an						POWER
		ohm-meter.						POWER
		ohm-meter.						LEVEL
		(Remove wire leads from relay 2 and						LEVEL
		(Remove wire leads from relay 2 and
		operate the unit.)						1	4 sec		18 sec
								1	4 sec		18 sec
								2	6 sec		16 sec
								3	8 sec		14 sec
								4	10 sec		12 sec
								5	12 sec		10 sec
								6	14 sec		8 sec
								7	16 sec		6 sec
								8	18 sec		4 sec
								9	20 sec		2 sec
								10	22 sec		0 sec
								10	22 sec		0 sec

		Relay 2

		Measure the resistance.						Normal:
	FAN MOTOR	(Ohm-meter scale: R x 1)						Normal:
	FAN MOTOR	(Ohm-meter scale: R x 1)						A: Approx. 85 ~ 100 ohm.
	(Wire leads removed)							A: Approx. 85 ~ 100 ohm.
	(Wire leads removed)							B: Approx. 10 ~ 25 ohm.
								B: Approx. 10 ~ 25 ohm.
								Abnormal: Infinite or several
									ohm.
									ohm.

B

A

	Measure the resistance.		Normal: Approx.100~150 ohm
TURNTABLE	(Ohm-meter scale: R x 1 )		Normal: Approx.100~150 ohm
TURNTABLE	(Ohm-meter scale: R x 1 )		Abnormal: Infinite or several
MOTOR			Abnormal: Infinite or several
MOTOR			ohm.
(Wire leads removed)			ohm.
(Wire leads removed)

NOTE : ¥ A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.

¥MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.

¥WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES.

5-10

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Contents Microwave Oven Safety Precautions Type of Microwave Oven Function & Type 1/2How a Microwave Oven Works Function & Type 2/2 Grill CookingInstallation & Utensils 1/2 InstallationInstallation & Utensils 2/2 Cooking UtensilsPrinciple of dielectric heating What’s the microwave? 1/2History of dielectric heating Definition of electric wave Safety of microwave ovenWhat’s the microwave? 2/2 Conventional heating vs. dielectric heating Conventional heatingConstruction of microwave oven CavityDoor ControllerHow does the microwave oven operate? Input Senondary Winding AT Microwave generation systemMagnetron 1/2 Testing Magnetron Tube Microwave generation systemMagnetron 2/2What is Multi-Wave Multiwave systemInfrared sensor What’s the infrared sensor?Auto moving heater What’s does move automatically?Conventional Heater LG’s Auto Moving HeaterSpecifications Features Control PanelOperating Sequence Schematic Circuit Description Tools and Measuring Instruments Microwave Leakage TestNecessary Tools Necessary Measuring InstrumentsRecord Keeping and Notification After Measurement Measurement with Outer Case RemovedMeasurement with a Fully Assembled Oven Measurement of Microwave Power Output Disassembly and AdjustmentPower Supply Cord Control Panel AssemblyPCB Assembly Removal Door Main Assembly RemovalRemoving the Turntable Motor AIR Duct Assembly RemovalMagnetron Removal FAN Motor Assembly Removal High Voltage Transformer RemovalHigh Voltage Capacitor and Diode Removal Interlock SystemPrimary Interlock Switch Test Secondary Interlock Switch TestMonitor Switch Test Interlock Continuity TestComponent Test Procedure Components Test ProcedureComponents Test Procedure Results Relay Trouble Shooting Condition Cause RemedyResult Result Condition Check Defective PCB assembly Defective high voltage transformer Exploded View IntroductionDoor Parts Controller Parts Oven Cavity Parts Latch Board Parts Interior Parts Base Plate Parts Schematic Diagram of P.C.B Printed Circuit Board