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5.10 Magnetron Over-Temperature Switch
The Magnetron Over-temperature Switch is designed to protect the magnetron from
overheating. During normal operation, the switch is closed . The over-temperature
switch opens when the magnetron case exceeds 212°F (100°C). Overheating may
occur due to a dirty or blocked Air Filter or a failed Magnetron Cooling Fan.
5.11 RF Output Monitor Circuit
A RF sensor in the microwave waveguide assembly detects a portion of the radio
frequency (2450 MHz) energy emitted during the operation of the magnetron(s). A RF
Cable Assembly connects the RF Pickup to a SMA connector on the I/O Circuit Card
Assembly, CCA. On the I/O Circuit Card Assembly, the RF energy is detected and
amplified. The amplifier gain is controlled by R10 on the I/O CCA. The analog signal is
then routed via a flat cable to the Control CCA where it is digitized by the
microprocessor for control and display. Note: RF readings are displayed in
MAINTenance and Diagnostic displays. The readings, measured over a 10 second
period, must fluctuate a minimum of 50 units to pass self-test and 20 units to pass the
on-line tests (while cooking). The Mode Stirrer rotates once every 8.3 seconds (10
seconds for 50 Hz units).
TurboChef, Inc.
MAGNETRON OVER-TEMPERATURE SWITCH
RF OUTPUT MONITOR CIRCUIT
700-0655.DOC Rev B February 15, 1997
Page 41 of 62
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