Philips PM 5508 Operating Manual page 48

51
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Fig. VII-24. Vectorscope display of the "MATRIX"-pattern
1. • Switch off the red and blue guns of the colour picture tube. The pattern
on the screen now consists of four green bars. Bars 1 and 4 should
have the same intensity, while bar 2 is more bright and bar 3 is less
bright than bars 1 and 4.
2. • Bars 1 and 4 should disappear (be cut off) at the same moment
_,,, when the brightness control of the receiver is turned anti-clockwise.
If not, the (G-Y)-output signal of the matrixing circuit is not correct.
Readjust according to the instructions in the Service Notes of the
relevant receiver.
3. • If the circuitry is completely misaligned, (e.g. after replacement of
parts), it is advisable to follow the procedure as described in section
K "Adjusting with the oscilloscope", page 58.