– 65 –
Lower Door Latch Does Not Work
Enter the service mode and
set the lower latch to lock.
Is the lower latch locked?
No
Yes
Disconnect the latch motor connectors.
Is 120 VAC present from the LORB
relay K15 NO contact to AC IN (NT)?
Is 120 VAC present from
the LORB relay K15 NO
contact to the EMI filter
board IN2 contact?
Yes
Is 120 VAC present from
the LORB relay K15 NO
contact to the EMI filter
board OUT2 contact?
Yes
Is 120 VAC present from
the positive to negative
latch motor contacts?
Yes
Replace the
latch motor.
Is 120 VAC present from the LORB relay
K15 COM contact to AC IN (NT)?
Yes
Is 0 VDC present from the
LORB connectors J4, pin 13
to MPB J5, pin 2?
Yes
No
No
Is 120 VAC present from the EMI filter
board OUT1 contact to AC IN (NT)?
Repair the faulty wire between
LORB K15 and the EMI filter
board OUT 1 contact.
Yes
No
Is 120 VAC present from the EMI filter
board IN1 contact to AC IN (NT)?
Replace the EMI
filter board.
Yes
Repair the faulty L1 input
wire to the EMI filter board
IN1 contact.
No
Replace
the LORB.
Replace
the MLB.
No No
No
Repair the faulty NT input wire to
the EMI filter board IN2 contact.
Replace the
EMI filter board.
Replace the plunger switch or repair
the faulty wire from the EMI filter board
OUT2 contact to the motor latch.
Yes
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