Goldstar MA-2005ST service manual Condition Check

Page 36

(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched.

CONDITION	CHECK	RESULT
1. Setting time	Check continuity	No continuity.
does not count	of secondary
down when	switch (with
touching START	door closed).	Continuity.
pad.		Continuity.
pad.
	Check the con-	Continuity
	nection between	Continuity
	nection between
	CN1 connector

CAUSE			REMEDY


Defective			Replace
secondary switch.			secondary switch.

Defective PCB			Replace PCB
assembly.			assembly.

and PCB		No continuity
assembly.		No continuity
assembly.

Loose connection.

Connect them tightly.

2.Fan motor or Check fan motor. oven lamp do

not turn on.		Check oven lamp.

Abnormal

Abnormal

Defective fan motor.

Defective oven lamp.

Replace fan motor.

Replace oven lamp.

Normal

(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.

CONDITION

CHECK

RESULT

CAUSE

REMEDY

Output is low

Check the			Lower than 90% of
Check the			rating voltage.
power source			rating voltage.


voltage.
voltage.

		Normal
	Disconnect the	Abnormal
	wire leads from	Abnormal
	wire leads from
	relay 2 and
	check on and off	Normal
	time with	Normal
	time with
	multitester.

Decrease in power source voltage with load.

Defective PCB assembly.

Suggest customer contact local electric power utility co. or qualified electrician.

Replace PCB assembly.

	Measure the	Abnormal	Defective
	output power.		magnetron.

Replace magnetron.

NOTE : Simple test of power output-conducted by heating one liter water for one min. if available. Minimum 8.5¡C temperature rise is normal condition.

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Image 36

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 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 InstrumentsMeasurement with Outer Case Removed Measurement with a Fully Assembled OvenRecord Keeping and Notification After Measurement Measurement of Microwave Power Output Disassembly and AdjustmentPower Supply Cord Control Panel AssemblyPCB Assembly Removal Door Main Assembly RemovalAIR Duct Assembly Removal Magnetron RemovalRemoving the Turntable Motor 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