Major Components; Magnetron; How To Diagnose For An Open Filament Or A Shorted Magnetron - Panasonic Microwave Ovens with Inverters Technical Manual

Major components.

Magnetron

In a microwave oven, the magnetron is used to produce the high frequency
required for cooking. The frequency of microwaves for general cooking is
2,450MHz.
Filament Terminals

How to diagnose for an open filament or a shorted magnetron

To check for open filament:
• Disconnect the filament leads.
• Measure the resistance across the filament terminals. The normal
resistance is approximately 1 ohm or less.
To check for a shorted magnetron:
• Disconnect the filament leads.
• Measure the resistance between each filament terminal and the
magnetron case. Normally it should read open.
Note:
Do not rely on continuity check alone to determine if a magnetron is defective.
Normal continuity reading can be obtained from a magnetron that is defective.
Magnetron components
Antenna Gasket
Figure 3
4
Cooling
Fins
Antenna