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28
B. Pattern 2.
"WHITE"
.......,,i!i;iiiililll
Fig. VII-4.
"WHITE"-pattern
i~i,i~~;i~lll~
ii ~
:::
:
_
nnnu:a:d:iifiilll':I iiiy~:•.~o~n 3••: . ._
This pattern consists of a 100% white signal without chroma, but with
PAL-alternating burst.
1. •
Check the picture for constant brightness over the entire screen
(no hum, etc.).
2. •
Check the "white-C"-adjustment of the colour-picture tube (readjust-
ment is required after e.g. replacement of the picture tube). This should
be done with control "BURST AMPL" in position "NOM".
Some colour receivers switch automatically from "black/white"-
white to "colour"-white (standard White-C). This, the so-termed
preferred-white adjustment, can be checked by setting control
"BURST AMPL." from "0%" to "NOM" and back.
3. •
This pattern is also necessary to check and readjust the limiting of
the beam-current of the colour picture tube. For details about this
adjustment, refer to the Service Notes of the relevant receiver.
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