Service Information

!WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

Proper Handling of Magnetron Tubes

!CAUTION

A magnetron tube, like a radio or television tube must be handled with a reasonable amount of care. When handling a tube, always handle by the housing only. Use caution not to touch or strike the ceramic portion at the top. The carton used to ship service replacement tubes is reusable.

Magnetron Failure Modes

Magnetron failures that have been identified are generally grouped into categories shown below.

1.Shorted

Air - This is a case where the tube has had the vacuum envelope destroyed and air has entered the tube. This will cause internal arcing and high secondary current if high voltage is applied.

R.F. Capacitors - May short to chassis. This condition will also cause loss of high voltage.

2.Open Heater (Filament) - Can be determined by a ohmmeter when transformer leads are disconnected. Resistance is normally less than one ohm; filament does not short internally. Any tube removed should be checked since usage tends to make the filament more fragile. Later handling and shipping may open the filament and thereby mask the true failure mode when checked at the factory.

3.Low Power - Caused by “wearout” of the emission characteristics of the directly heated cathode. Symptoms are: (1) tube current will take longer to get to operating point than a new tube (normally about 2 - 3 seconds), (2) tube current does not get high enough to cause the tube to oscillate with normal line voltage, (3) oven produces low power into a load, two-thirds or less than normal.

4.Physical Damage - Caused by mishandling of magnetron tube.

Output

Antenna

Ceramic

Fins

Anode

Block

Magnet

Terminals/R.F. Capacitors

Not Replaceable

Serial Number

©2006 Maytag Services

16026795

17

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Maytag 1800 W - 2005 manual Service Information, Proper Handling of Magnetron Tubes, Magnetron Failure Modes, Shorted

1800 W - 2005 specifications

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