A junction box includes a cable connecting body and a cover covering the cable connecting body. When it is desired to provide a short circuit to the waveguide, for a safety lockout or other uses, the vane can be rotated into a position to provide a substantial barrier to RF propagation. Liquid stored in the second tank is supplied to a liquid ejecting head having an ejection surface. A reflection plate is disposed under the light guiding plate for reflecting the light to the light guiding plate.