A TV SCART cable allows to connect the CPC/CPCplus to the TV set. This is especially helpful if you couldn't get your hands on a colour monitor or want to use the CPC/CPCplus as a video console in the living room.
Schematics
Amstrad/Schneider CPC (classic)
Colour Picture (RGB)
Black & White Monochrome Picture
Alternative RGB Wiring
Amstrad CPCplus (In theory also GX4000, but it has its own SCART outlet)
Colour Picture (RGB)
Black & White Monochrome Picture
Additional Resistors
Info from OCT: "I recall that when Amstrad Action came up with the proposal for a SCART cable back in issue AA41, numerous readers wrote in suggesting that resistors (most commonly: slightly below 330 ohms) should be connected "in series to the colour signals [...] for improving picture quality" (AA45, June 1989, FORUM, p. 23), so they seem to have appeared overblown in comparison to the CTM644s' back in the day."
Videos
A SCART cable howto:
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