Philips PM 5508 Operating Manual page 43

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Fig. VII-20. Incorrect subcarrier phase to the (R-Y) demodulator
3. • A colour difference between the upper and lower parts of bar 2
((R-Y) — 0) indicates an incorrect subcarrier phase to the (R-Y)
demodulator. See Fig. VII-20. Readjust until the colour difference has
been eliminated.