LG LMH2235ST, Service Manual

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9. INTERLOCK SYSTEM
9-1. Interlock Mechanism
The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity
when the door is opened during cooking and thus to prevent the danger resulting from microwave leakage.
ADJUSTMENT PROCEDURES
To avoid possible exposure to microwave energy
leakage, adjust the door latches and interlock
switches, using the following procedure.
The Interlock Monitor and Primary Interlock Switch act
as the final safety switch protecting the user from
microwave energy. The terminals between COM and
NC of the Interlock Monitor must close when the door
is opened. After adjusting the Interlock Monitor Switch,
make sure that it is correctly connected.
Mounting of the primary/monitor/secondary switches
to the latch board.
CHECK THE DOOR LATCH AND SWITCH
CLOSING.
NOTE:
The outer cover of the microwave oven is
removed.
(1) Set the microwave oven on its side so that you
can see the latch board and the switches, as
shown inFigure 23-a.
(2) Close the door tightly and check gaps A and B to
be sure they are no more than 1/64” (0.5 mm).
See Figure 23-b for close-up view of gaps A and B
(door latches). If all gaps are less than 1/64”
(0.5 mm), adjustment of the latch board may not
be necessary. Go to Steps 5 and 6 to check the
sequence of the switches.
NOTE:
The correct sequence of the Primary Interlock
Switch, Secondary Interlock Switch and the
Interlock Monitor Switch is very important.
If any gap is larger than 1/64” (0.5 mm), you
will need to adjust the latch board. Go to step
3 and follow all steps in order.
ADJUST THE LATCH AND SWITCH CLOSING
(3) Loosen the two screws holding the plastic latch
board as shown.
(4) With the oven door closed tightly, move the latch
board upward toward the top of the oven and/or
away from the door latch until the gaps are less
than 1/64 ” (0.5 mm).
Hold the latch board tightly in this position until
you check the sequence of the switches in steps 5
and 6.
Figure 23-a
Figure 23-b