Sharp r-8580 manual Test

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	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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