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Left and Right Door Switch Assemblies
The primary interlock, monitor interlock, and door
sensing (secondary interlock) switches function
together as an interlock system. The primary
purpose of the interlock system is to interrupt
the production of microwave energy when the
oven door is opened, and similarly, to prevent any
microwave output until the door is
fi
rmly and safely
closed.
When the door is opened,
fi
rst the primary switch
opens its contacts. Second, the door sensing switch
opens. Finally, the monitor interlock switch closes
its contacts. If any of the switches fail to open their
contacts properly when the door is opened, a short
circuit is created when the monitor interlock switch
closes its contacts and the noise
fi
lter fuse will open.
Note:
If the door sensing switch is open, the display
will tell the user to “close the door” – user can
program the unit but no cook function will operate.
If the primary door switch is open, the display will
function but microwave heating, and the turntable,
convection, and damper motors will not operate.
The purpose of the halogen heater interlock switch
is to prevent halogen heater operation when the
door is open.
The primary interlock, monitor interlock, door
sensing, and halogen heater interlock switches are
mounted on plastic latch boards. The latch boards
are attached to the left and right side of the oven
cavity. The left side latch board contains the door
sensing (secondary interlock) and halogen switches.
The right side latch board contains the primary
interlock and monitor interlock switches.
LEFT LATCH BOARD
RIGHT LATCH BOARD
Halogen Heater Interlock
Monitor Interlock Switch
Door Sensing
(Secondary Interlock)
Primary Interlock
Switch
Right side Latch Board Shown
How to Test Primary Interlock, Door Sensing, and
Halogen Switches:
Disconnect power and partially remove the
1.
oven from it’s installation. (See
Oven Removal /
Partial Removal
.
)
Remove the single Phillips-head screw that
2.
holds each door switch access cover to the
outer cover.
Remove the primary interlock, door sensing, and
3.
halogen switch leads to isolate each switch.
Check continuity of each switch with door open
4.
and door closed. Normal readings are as follows:
• Door Closed: 0
Ω
• Door Open: In
fi
nity
How to Test the Monitor Switch:
Note:
The right side latch pawl pushes horizontally
and actuates the lever of the monitor interlock,
opening the switch.
Disconnect power and partially remove the
1.
oven from it’s installation. (See
Oven Removal /
Partial Removal
.
)
Remove the single Phillips-head screw that
2.
holds the right side door switch access cover to
the outer cover.
Remove the monitor switch leads to isolate the
3.
switch.
Monitor Interlock Switch
Primary Interlock Switch
