Goldstar MA-2005ST service manual Result

Page 35

(TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted.

CONDITION

1. Fuse blows.

	CHECK	RESULT
	Check continuity	Continuity.
	of monitor	Continuity.
	of monitor
	switch (with
	door closed).	No continuity.
		No continuity.
	Replace fuse

CAUSE

Malfunction of the monitor switch.

REMEDY

Replace fuse, primary, monitor, secondary switches, and RELAY(RY2) of P.C.B Assembly.

Check continuity				Continuity.
of primary				Continuity.
of primary
switch (with
door opened).				No continuity.

	Check continuity	Continuity.
	of secondary	Continuity.
	of secondary
	switch (with
	door opened).	No continuity.
		No continuity.

Shorted contact at the primary switch.

Malfunction of secondary switch.

Replace fuse, primary, monitor, secondary switches, and RELAY(RY2) of P.C.B Assembly.

Replace fuse, primary, monitor, secondary switches, and RELAY(RY2) of P.C.B Assembly.

	Disconnect one	Normal.
	side of the wire	Normal.
	side of the wire
	lead connected
	from transformer	Fuse blows again
	to the high	Fuse blows again
	to the high
	voltage
	capacitor and
	operate the unit.

Defective high			Replace high
voltage capacitor.			voltage capacitor.


Defective high volt-			Replace high volt-
age transformer.			age transformer.

NOTE : All these switches must be replaced at the same time. Refer to page 5-7, 5-8

2.Fuse does not blow.

	Check continuity				No continuity.
	Check continuity				No continuity.
	of thermostat.
	of thermostat.

					Continuity.

Check continuity No continuity. of power supply

cord.

Defective thermostat.

Defective power supply cord.

Replace thermostat.

Replace power supply cord.

5-13

Image 35

Contents Microwave Oven Safety Precautions Type of Microwave Oven Function & Type 1/2How a Microwave Oven Works Grill Cooking Function & Type 2/2Installation Installation & Utensils 1/2Cooking Utensils Installation & Utensils 2/2Principle 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 Conventional heating vs. dielectric heatingController Construction of microwave ovenCavity DoorHow does the microwave oven operate? Input Senondary Winding AT Microwave generation systemMagnetron 1/2 Microwave generation systemMagnetron 2/2 Testing Magnetron TubeMultiwave system What is Multi-WaveWhat’s the infrared sensor? Infrared sensorLG’s Auto Moving Heater Auto moving heaterWhat’s does move automatically? Conventional HeaterSpecifications Control Panel FeaturesOperating Sequence Schematic Circuit Description Necessary Measuring Instruments Tools and Measuring InstrumentsMicrowave Leakage Test Necessary ToolsRecord Keeping and Notification After Measurement Measurement with Outer Case RemovedMeasurement with a Fully Assembled Oven Control Panel Assembly Measurement of Microwave Power OutputDisassembly and Adjustment Power Supply CordDoor Main Assembly Removal PCB Assembly RemovalRemoving the Turntable Motor AIR Duct Assembly RemovalMagnetron Removal Interlock System FAN Motor Assembly RemovalHigh Voltage Transformer Removal High Voltage Capacitor and Diode RemovalInterlock Continuity Test Primary Interlock Switch TestSecondary Interlock Switch Test Monitor Switch TestComponents Test Procedure Component Test ProcedureComponents Test Procedure Results Relay Condition Cause Remedy Trouble ShootingResult Result Condition Check Defective PCB assembly Defective high voltage transformer Introduction Exploded ViewDoor Parts Controller Parts Oven Cavity Parts Latch Board Parts Interior Parts Base Plate Parts Schematic Diagram of P.C.B Printed Circuit Board