Adjusting video level for IF

[TinCanAlley]

Does anyone know where the video level adjustment (assuming it's a coil on the IF module) is located? On bright scenes and white text I'm getting an overload of signal causing a lot of buzzing. I looked up the problem and it says I need to lower the video level (usually located near the IF section).

I found that IF module has a "video input IF" coil. Is that it? The instructions says to adjust it while viewing a bright scene until the noise is gone.

Thanks!