Panasonic cp747 no output

Hi everyone, this think I have a Panasonic cp747 security camera with ntsc output from what I can gather from manuals. I’ve tried running it out through multiple mixers but just get a black screen. Wondering if an ntsc to pal adapter might help, one mixer is pal but the other is v4 and I’ve tried both output resolutions…Power seems ok so not sure what to try…any advice is greatly appreciated! It sort of looks like this for reference