Pattern 3: "Red" - Philips PM 5508 Operating Manual

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C. Pattern 3.
"RED"
Fig. VII-5. "RED"-pattern
This pattern consists of a fully saturated red signal with PAL-alternating burst.
1. ~ Furst set the brightness and saturation controls of the receiver
clockwise and then turn them -anti-clockwise until the blue and green
dots disappear and only the red dots remain.