Goldstar MA-2005ST service manual Component Test Procedure, Components Test Procedure

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COMPONENT TEST PROCEDURE

CAUTIONS

1.DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)

2.ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.

COMPONENTS

TEST PROCEDURE

RESULTS

HIGH VOLTAGE TRANSFORMER (Wire leads removed)

FILAMENT WINDING

SECONDARY

PRIMARY

TERMINAL

1.Measure the resistance. (Ohm-meter scale: Rx1 and Rx100)

¥ Primary winding	Approx.: 0.2 ~ 0.4 ohm
¥ Secondary winding	Approx.: 60 ~ 90 ohm
¥ Filament winding	Less than: 1 ohm
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
¥ Primary winding to ground	Normal: Infinite
¥ Filament winding to ground	Normal: Infinite

MAGNETRON

(Wire leads removed)

1.	Measure the resistance.
	(Ohm-meter scale: Rx1)	Normal: Less than 1 ohm
	¥ Filament terminal
2.	Measure the resistance.
	(Ohm-meter scale: Rx1000)	Normal: Infinite
	¥ Filament to chassis

5-8

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Contents Microwave Oven Safety Precautions Function & Type 1/2 How a Microwave Oven WorksType of Microwave Oven Function & Type 2/2 Grill CookingInstallation & Utensils 1/2 InstallationInstallation & Utensils 2/2 Cooking UtensilsWhat’s the microwave? 1/2 History of dielectric heatingPrinciple of dielectric heating Safety of microwave oven What’s the microwave? 2/2Definition of electric wave Conventional heating vs. dielectric heating Conventional heatingDoor Construction of microwave ovenCavity 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?Conventional Heater Auto moving heaterWhat’s does move automatically? LG’s Auto Moving HeaterSpecifications Features Control PanelOperating Sequence Schematic Circuit Description Necessary Tools Tools and Measuring InstrumentsMicrowave Leakage Test Necessary Measuring InstrumentsMeasurement with Outer Case Removed Measurement with a Fully Assembled OvenRecord Keeping and Notification After Measurement Power Supply Cord Measurement of Microwave Power OutputDisassembly and Adjustment Control Panel AssemblyPCB Assembly Removal Door Main Assembly RemovalAIR Duct Assembly Removal Magnetron RemovalRemoving the Turntable Motor High Voltage Capacitor and Diode Removal FAN Motor Assembly RemovalHigh Voltage Transformer Removal Interlock SystemMonitor Switch Test Primary Interlock Switch TestSecondary Interlock 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