GE JS998 Series - Latch Motor Not Working Troubleshooting

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Latch Motor Does Not Work
Enter the service mode
and set the latch to lock.
Does the latch lock?
Disconnect the connector on the motor latch.
Is 120 VAC present from the MPB relay K2
NO contact to AC IN (NT)?
Yes
No
Is 120 VAC present from the MPB
relay K2 NO contact to the EMI
filter board IN2 contact?
Yes
Is 120 VAC present from the MPB
relay K2 NO contact to the EMI
filter board OUT2 contact?
Yes
Is 120 VAC present from the MPB relay
K2 NO contact to the motor latch ?
Yes
Is 120 VAC present from the positive
contact to the negative contact
of the motor latch?
Yes
Replace the
motor latch.
Is 120 VAC present from
the MPB relay K2 COM
contact to AC IN (NT)?
Yes
Is 0 VDC present from
the MLB connectors
J3, pin 14 to J5, pin 2?
Yes
No
Is 120 VAC present from
the EMI filter board OUT1
contact to AC IN (NT)?
No
Is 120 VAC present from
the EMI filter board IN1
contact to AC IN (NT)?
No
Repair the faulty wiring
from L1 input to the EMI
filter board.
Repair the faulty wiring from NT
input to the EMI filter board.
No No
Replace the EMI
filter board.
Repair the faulty wiring
from the EMI filter board
to the motor latch.
No
Repair the faulty wiring from
the MLB relay K2 NO contact
to the motor latch.
No
No
Replace
the MLB.
Replace
the MPB.
Repair the faulty wiring from
the MPB relay K2 COM contact
to the EMI filter board.
Yes
Replace the EMI
filter board.
Yes
Yes