Philips PM 5508 Operating Manual page 54

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d. Signal phase Incorrect
Fig. VII-29. Green-colourdifference-signal of "COLOUR BAR"-pattern
The "COLOUR BAR"-pattern can also be used for a number of checks and
adjustments described in the Service Notes of the receiver, e.g.:
— checking the burst keying
— checking the colour AGC and the colour killer circuit (by operating
control "BURST AMPL.").
— checking the reactance circuit of the subcarrier regenerator.
— checking the synchronisation of the subcarrier regenerator.
— checking the PAL identification circuit.
Note:
In case of fault-finding in a receiver by means of following the signal
through the various circuits,
it
is recommended, to employ a simpler pattern
like e.g. "MATRIX" instead of the "COLOUR BAR" pattern.