Goldstar MV-1155W, Service Manual

Page: 31 / 48

(2) CHECKOUT PROCEDURES FOR RELAY
— 29—
PROBLEM (A)
FAN motor and oven lamp turn on without
touching START key when the door is closed.
YES NO
YES NO
Good
Remove the mate connector
of I/O CON from the circuit
board.
Does the unit still operate?
Defective
RELAY 1
PROBLEM (B)
NO YES
YES NO
Good
Replace the
circuit board
Defective
RELAY or poor
connection of
RELAY.
Replace
RELAY or
correct the
connection.
FAN motor and oven lamp turn on when the
door is closed and START key is touched.
Measure the voltage at pin
NO. 38 of U01 or 12 U03.
Voltage reading : 0 Vdc.
Replace
RELAY 1
Replace the
circuit board