Sharp r-8580 Microwave Oven User Manual


 
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
I
OPERATIONAL
CONNECTED COMPONENTS
VOLTAGE
I
RYl (COOK)
Approx. 14 V. D. C.
RY2
Approx. 14 V.D.C.
RY3
Approx. 14 V.D.C.
RY4 (HEATER)
Approx. 14 V.D.C.
RY5
Approx. 14 V. D. C.
RY6
Aoorox. 14 V.D.C.
Power transformer
Oven lamp/Turntable motor
Convection motor
Heating element
Cooling fan motor
DamDer motor
(RD82R02U)
18