Magnetron; Testing A Magnetron For An Open/Shorted Filament; Stirrer Motor And Assembly; Waveguide - TurboChef Eco Service Manual

Magnetron

The magnetron (Figure 79) supplies RF energy at
2.45 GHz. The magnetron will start to oscillate
once it is supplied with approximately 4.1 kVDC
at approximately .350 mA. During operation, the
magnetron will output a nominal 1 kW of power.
Perform a microwave leakage test (page 36) after
installing a new magnetron or reinstalling an old
one.
FA F
Antenna ANTENNA
Figure 79: Magnetron
Testing a Magnetron for an Open/Shorted
Filament
DANGER: The only safe way to test a
magnetron is by a resistance test of its filament.
Never attempt to measure the magnetron using
any other method while the microwave system
is on. Death or serious injury could occur.
1. Disconnect the AC power source and discharge
the high-voltage capacitor.
2. Isolate the magnetron from the circuit by
removing the wires from the F and FA
terminals. Figure 79.
3. An ohmmeter connected between the filament
terminals (F, FA) should indicate a reading of
less than 1 ohm. Figure 79.
4. A continuity check between either filament
terminal and the magnetron chassis should
indicate an infinite resistance (open).
CAUTION: Do not allow debris to enter the
waveguides when servicing the magnetrons.
FILAMENT AND
Filament and High
HIGH VOLTAGE
Voltage Terminals
TERMINALS

Stirrer Motor and Assembly

The stirrer is responsible for evenly distributing hot
air and microwave that enters the cook cavity from
the top. The stirrer is driven by a 15 RPM motor,
which remains on during a cook cycle or when the
oven is in Test Mode.
The stirrer motor can be tested in Test Mode (see
page 18).
CAUTION: Do not allow debris to enter the
waveguides when servicing the stirrer.

Waveguide

The waveguide channels microwave into the
cook cavity. If debris or contamination gets into
the waveguide, the life of the magnetron may be
shortened. Be careful to not allow debris into the
waveguide when servicing the magnetrons or stirrer
assembly.

Troubleshooting

The following faults may occur in relation to the
microwave system:
• F3: Magnetron Current Low (see page 49)
• F5: Magnetron Over Temperature (see page 50)
The following issues may occur in relation to the
microwave system:
• Food not cooking properly (see page 60).
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