Damper Door Switch; Magnetron And Magnetron Tco - GE JK3800DH1BB Technical Service Manual

Damper Door Switch

The damper door sensing switch is mounted to the
damper assembly. The switch monitors the damper
door position and provides this information to the
main PCB, which controls the operation of the
damper door motor.
When the damper door is closed, the switch is open.
The motor will run until the switch sends the door
closed signal. If the damper door sensing switch
circuit shorts (or opens), the damper motor will run
continually. The damper motor has an approximate
Damper Door Operating Modes
Cooking Damper
Mode Position
Microwave Open
Speedcook Closed
Switch Switch
Plunger Contacts
Position
Not Closed
Depressed
Depressed Open
– 49 –

Magnetron and Magnetron TCO

WARNING: Always be certain the capacitor is
discharged before servicing. (See the Capacitor and
Diode section in this guide.) Mechanically discharge
by placing insulated pliers between the diode
connection of the capacitor and the oven chassis
ground.
NOTE: The capacitor has an internal discharge
resistor that automatically discharges the capacitor
when the oven turns OFF. Under normal operation,
the capacitor should fully discharge within 30
seconds.
The oven must be removed to access the
magnetron. (See the Removing Upper Oven section
in this guide.) The magnetron is located behind the
top access cover. The top access cover is held in
place by two Phillips head screws. The magnetron
is held in place by four Phillips head screws. The
magnetron thermostat must be disconnected
before removing the magnetron.
Magnetron TCO
The magnetron TCO is attached to a bracket
mounted to the magnetron. The magnetron bracket
is held in place by a single Phillips head screw.
This position of the magnetron TCO allows it to
sense the temperature of the magnetron.
The magnetron TCO opens at 302°F and cannot be
reset. If the magnetron TCO opens, it will disable all
oven functions including the display.