Sears 721.88502800 Manual page 31

(2)CHECKOUT PROCEDURES FOR RELAY.
-PROBLEM (A)-
FAN motor turns on without touching START key
when the door is closed.
NO
Remove the mate connector of I/O
GOOD
CON from the circuit board.
Does the unit still operate?
Replace the
circuit board
-PROBLEM (B)-
FAN motor turns on When the door is closed and
START key is touched.
YES
Measure the voltage at pin NO.
GOOD
1, 7 of CN2
Voltage reading: 120 V AC
Replace the
circuit board
YES
NO YES
Defective
Wire Assembly
Replace
Wire Assembly
NO
NO YES
Defective
FAN motor
Replace
FAN motor.
Oven lamp turns on without touching START key
when the door is closed.
NO
GOOD
Replace the
circuit board
Oven lamp turns on When the door is closed and
START key is touched.
YES
GOOD
Replace the
circuit board
7-20
-PROBLEM (A)--
YES
Remove the mate connector of I/O
CON from the circuit board.
Does the unit still operate?
NO
Defective
Wire Assembly
Replace
Wire Assembly
-PROBLEM (B)-
NO
Measure the voltage at pin NO.
1, 5 of CN2
Voltage reading: 120 V AC
NO
Defective
Oven lamp
Replace
Oven lamp
YES
YES