GE JVM1790SK - Profile 1.7 cu. Ft. Convection Microwave Service Manual page 31

(2) CHECKOUT PROCEDURES FOR RELAY.
FAN motor and oven lamp turn on without touching
START key when the door is closed.
NO
GOOD
Replace the
circuit board
- PROBLEM (A) -
YES
Remove the mate connector of I/O
CON from the circuit board.
Does the unit still operate?
NO YES
Defective
RELAY1
Replace
RELAY1
FAN motor and oven lamp turn on When the door is
closed and START key is touched.
YES
GOOD
7-20
- PROBLEM (B) -
NO
Replace the
circuit board