GE Profile Performance ADVANTIUM SCA2000BAA Service Manual page 30

THERMAL SAFETY
In the unlikely event that internal oven cavity tem-
peratures exceed 600+ degrees F., speedcooking
operation will be terminated.
The oven cavity thermistor is constantly sensing
oven cavity temperatures and providing input to
the smartboard. When the smartboard deter-
mines that 600+ degrees F. has been reached, it
will terminate speedcooking operation and return
the oven display to its normal off position (with
time-of-day clock showing in the display). When
the unit cools, it will return to normal operation.
Thermal safety provides an additional means of
thermal protection, in addition to the thermal pro-
tection mode mentioned on the previous page.
DAMPER DOOR ASSEMBLY
The damper door assembly has a metal semi-
round door, which rotates by control of a damper
motor, to open and close off air from the damper
chamber to the oven cavity. The thermal fuse,
door sensing switch and oven cavity lamp mount
to the damper door assembly.
DOOR
SENSING
SWITCH
During microwave oven cooking, the damper door
is fully open allowing air to travel through and
around the magnetron tube, into the oven cavity
(see illustration upper right).
THERMAL
FUSE
DAMPER
MOTOR
OVEN CAVITY
LAMP
DAMPER DOOR SHOWN IN OPEN
POSITION ALLOWING AIRFLOW
INTO OVEN CAVITY
DOOR ASSY
Also during microwave cooking the metal damper
door is fully open, allowing the oven cavity lamp
to illuminate the oven interior.
MOUNTS TO
MAG TUBE
INSIDE BOTTOM VIEW OF DAMPER DOOR ASSEMBLY
During speedcooking operation (recipe or manual
speedcook), the metal damper door rotates into
the damper chamber, closing off air flow from the
magnetron blower into the oven cavity, and block-
ing the oven cavity lamp from illuminating the
oven interior. In doing so, heat from the oven
interior is contained in the oven cavity.
Door Sensing Switch
The damper door sensing switch is mounted to
the damper duct. The switch monitors the metal
door position and provides this information to the
smart board (metal damper door open or metal
damper door closed) which controls the direc-
tion and operation of the damper door motor. If
the damper door sensing switch shorts, or opens,
– 28 –
DAMPER
THERMAL
FUSE
OVEN CAVITY
OVEN CAVITY
LAMP SOCKET
MOUNTS TO