Sharp R-771(W)N Service Manual page 20

PROCEDURE
Relay Test
Check voltage at the relay coil with a D.C. voltmeter
during the microwave cooking operation.
convection cooking operation or grill operation.
DC. voltage indicated .......... Defective relay.
DC. voltage not indicated .... Check diode which
is connected to the relay coil. If diode is good,
contro! unit is defective.
| RELAY SYMBOL
R-771 - 20