Lowering Arcade PCB video voltage ?

[Level42]

I want to connect my Galaxian PCB to a TV with SCART connector (RGB). I've read that arcade PCB's ususaly put out 5Vtt signal levels fot the RGB. SCART however "expects" only 0,7Vtt.

I've seen that some here simply connect the signal to the SCART without anything to lower the voltage and it seems to work, but I was wondering if the inputs of the TV could be damaged this way ?

I figure a simple resistor in series would do the job of lowering the voltage (a value of around 400 ohms ?)

Also, is the sync (it's composite on the Galaxian) also on the same level and does this also need to be lowered ?