Microwave Drop-Down Door Series
Microwave Drop-Down Door Series
Controls & Operation
Controls & Operation
2-10
#826151 - Revision A - March, 2016
PRIMARY/SECONDARY INTERLOCK AND DOOR SENSING SWITCHES
When the microwave door is closed, the COM-NO contacts must be closed•
When the microwave door is opened, the COM-NO contact must be open•
MONITOR SWITCH
When the microwave door is closed, the COM-NC contacts must be open•
When the microwave door is opened, the COM-NC contacts must be closed•
NOTE: Before replacing a broken 20 amp fuse, test the primary interlock and monitor switch for proper operation.
Refer to Troubleshooting section, Test Procedure E
20 AMP FUSE
The 20 amp fuse breaks when the High Voltage (HV) rectifer, HV wire harness, HV capacitor, magnetron or the•
secondary winding of the power transformer is shorted
If the wire harness or an electrical component is shortcircuited, the 20 amp fuse breaks to prevent an electric•
shock or fire hazard
THERMAL CUT-OUT 145° C (CAVITY)
The thermal cut-out located on the top of the microwave cavity is designed to prevent damage to the microwave
if the food in the microwave catchs fire. Overheating occurs when cook time is set incorrectly or if the control
unit fails. Under normal operation, the oven thermal cut-out remains closed. When abnormally high tempera-
tures are reached within the microwave cavity, the oven thermal cut-out opens at 145° C, causing the
microwave to shut down. Replace the thermal cut-out.
THERMAL CUT-OUT 145° C (MAGNETRON)
This thermal cut-out protects the magnetron from overheating caused by fan motor interruption or blocked venti-
lation openings. If the temperature goes higher then 145° C the thermal cut-out opens and interrupt the line
voltage to the high voltage transformer. Operation of the magnetron stops. Replace the thermal cut-out.
TURNTABLE MOTOR
The turntable motor drives the turntable roller assembly to rotate the turntable.
FAN MOTOR
The fan motor drives the fan blades which draws external cool air into the air vanes surrounding the magnetron,
cooling the magnetron. The air then flows through the microwave cavity to remove steam and vapors from the
cooking food. It then exits through the exhaust air vents at the front of the microwave cavity.
NOISE FILTER
The noise filter prevents radio frequency interference from flowing back into the power circuit.
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