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The microwave waveguide is not responding.
The optical waveguide is not responding. It is out of order.

A multimeter can be used to measure the resistance of the lightwave tube. If it is normal within 20 to 300 ohms, if it is 0n or infinity, it is damaged. Replace it to troubleshoot.

It is also possible that the relay grid is not engaged and the contact RY2 is not closed, which cuts off the circuit of the light wave tube and the light wave does not heat up.