Test Procedures CONT’O Letter Component Relay Unit | Sharp r-8580

R-8580

TEST	PROCEDURES	(CONT’O)
PROCEDURE
LETTER	COMPONENT		TEST
N	RELAY	UNIT	TEST

The relay unit consists of circuits including the shut-off relays, buzzer, transformer, etc. Plug power cord into wall receptacle “88:88” will be flashing in the display.

Remove the outer case and check voltage between Pin Nos. 1 and 3 of the 6-pin connector (A) on the relay unit with an A.C. voltmeter.

The meter should indicate 240 volts, if not check oven circuit.

Shut-off, Cook and Heater Relay Test These relays are operated by D.C. voltage.

Check voltage at the relay coil with a D.C. voltmeter during the microwave or convection cooking operation.

DC. voltage indicated .,........ Defective relay.

DC. voltage not indicated ........Check diode which is connected to the relay coil. If diode is

good, control unit is defective.

I	RELAY	SYMBOL		OPERATIONAL			CONNECTED COMPONENTS
I			I	VOLTAGE					I
	RYl	(COOK)		Approx.	14	V. D. C.	Power	transformer
	RY2			Approx.	14	V.D.C.	Oven lamp/Turntable motor
	RY3			Approx.	14	V.D.C.	Convection		motor
	RY4	(HEATER)		Approx.	14	V.D.C.	Heating	element
	RY5			Approx.	14	V. D. C.	Cooling	fan	motor
	RY6			Aoorox.	14	V.D.C.	DamDer motor

(RD82R02U)

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Sharp r-8580 Test Procedures CONT’O Letter Component Relay Unit, Relay Symbol Operational Connected Components Voltage

Contents

Sharp 8580 Microwave RadiationSharpcorporatkn OSAKA, Japan Convection Microwave Oven Product Description Specification Auto-TouchTM Control Panel Cooking Condition OperationDescription of Operating Sequence OFF Condition Convection Cooking Condition Convection Cooking ConditionAutomatic MIX Cooking Condition Preheating Condition Cooking Sequence Sensor Cooking ConditionCompu Cook Easy Defrost Cooking 240V-50Hz G-4 Figure O-l. Oven Schematic-OFF Condition Figure O-3. Oven Schematic-Convection Cooking Condition Description and Function of Components Convection Cooking System Convection HeaterDamper OPEN-CLOSE Mechanism Servicing Problem Possible Cause Test Procedure CorrectionOFF Condjtion Problem Possible Cause Test Procedure or Correction Nents Defective Convection Heater Procedure RelayRY4 Unit Microwave Output Power Test Procedures Letter Component Magnetron Assembly Test High Voltage Rectifier and Rectifier Test Procedure Letter Test Procedures CONT’D Component TestPower Transformer Test Switch Test Thermal CUT-OUT Test Procedures CONT’D Letter Component Monitor Switch TestBlown Fuse TEMP. Fuse Test Damper Motor Test Procedure LetterDamper Switch Test Thermistor Test Relay Symbol Operational Connected Components Voltage Test Procedures CONT’O Letter Component Relay Unit KEY Unit Test Checking the initial sensor cooking condition Testing Method for AH Sensor AND/OR Control UnitWater load cooking test Steps Occurance Cause or Correction Sensor Dummy Resistor Circuit Outline of Touch Control Panel Touch Control Panel AssemblyLSI LSI IZA096DR Description of LSJ Internal clock oscillation frequency input settinq Seqment Data signalSeqment Data Siqnal Kev strobe siqnal Magnetron High-voltaae Circuit driving Signal Signal to SoundSignal svnchronized with commercial source frequencv50Hz Power source voltage Signal coming from touch key Damper motor relav driving signalInput signal which communicates the door open/close Signal cominq from touch kev Terminal For Manufacture Test Temperature measurement input Oven ThermistorSensor Inuut RI4 Sensor Circuit Absolute Humidity Servicing of Touch Control Panel Other PrecautionsServicing Shapes of Electronic Components Turntable Motor AND/OR Coupling Removal Component Replacement and Adjustment ProcedurePower Transformer Removal High Voltage Capacitor Removal Convection Motor Removal Magnetron RemovalCooling FAN Motor Removal Removal Upper Latch Switch / Monitor Switch RemovalLower Latch Switch and Stop Switch Removal Damper CPU Unit and KEY Unit Control Panel Assembly and CPU Unit Removal Door Replacement Door Replacement and AdjustmentDoor Adjustment Microwave Measurement Preparation for TestingRequirement 11II II II II OIL 8580 II I Figure S-3. Printed Wiring Board AY AK AF AH Parts List RR-DZ561PDREO Q8L AT AH FOVN-A090WRYO AG AD 11 AA 13 AA Ii AA Replacement Parts List 8580 ‘Y \‘\ Control Panel Parts Door Assembly Miscellaneous Packing and Accessories 8580 8580 Sharp