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

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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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Contents Sharp 8580 Microwave RadiationSharpcorporatkn OSAKA, Japan Convection Microwave OvenProduct Description SpecificationAuto-TouchTM Control Panel Cooking Condition OperationDescription of Operating Sequence OFF ConditionConvection Cooking Condition Convection Cooking ConditionAutomatic MIX Cooking Condition Preheating ConditionCooking Sequence Sensor Cooking ConditionCompu Cook Easy Defrost Cooking240V-50Hz G-4 Figure O-l. Oven Schematic-OFF ConditionFigure 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 TestHigh Voltage Rectifier and Rectifier Test Procedure Letter Test Procedures CONT’D Component TestPower Transformer Test Switch TestThermal CUT-OUT Test Procedures CONT’D Letter Component Monitor Switch TestBlown Fuse TEMP. Fuse TestDamper Motor Test Procedure LetterDamper Switch Test Thermistor TestRelay Symbol Operational Connected Components Voltage Test Procedures CONT’O Letter Component Relay UnitKEY 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 CircuitOutline of Touch Control Panel Touch Control Panel AssemblyLSI LSI IZA096DR Description of LSJInternal clock oscillation frequency input settinq Seqment Data signalSeqment Data Siqnal Kev strobe siqnalMagnetron High-voltaae Circuit driving Signal Signal to SoundSignal svnchronized with commercial source frequencv50Hz Power source voltageSignal coming from touch key Damper motor relav driving signalInput signal which communicates the door open/close Signal cominq from touch kevTerminal For Manufacture Test Temperature measurement input Oven ThermistorSensor Inuut RI4Sensor Circuit Absolute HumidityServicing of Touch Control Panel Other PrecautionsServicing Shapes of Electronic ComponentsTurntable Motor AND/OR Coupling Removal Component Replacement and Adjustment ProcedurePower Transformer Removal High Voltage Capacitor RemovalConvection Motor Removal Magnetron RemovalCooling FAN Motor Removal Removal Upper Latch Switch / Monitor Switch RemovalLower Latch Switch and Stop Switch Removal DamperCPU Unit and KEY Unit Control Panel Assembly and CPU Unit RemovalDoor Replacement Door Replacement and AdjustmentDoor Adjustment Microwave Measurement Preparation for TestingRequirement 11II II II II OIL 8580 II I Figure S-3. Printed Wiring BoardAY AK AF AH Parts ListRR-DZ561PDREO Q8LAT AH FOVN-A090WRYO AG AD 11 AA 13 AA Ii AA Replacement Parts List 8580 ‘Y \‘\ Control Panel Parts Door Assembly MiscellaneousPacking and Accessories 8580 8580 Sharp