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Grey-scale alignment
Grey-scale signal in antenna (or an equivalent signal). Saturation to
minimum. Correct tuning. Disconnect SW501.
Slowly adjust P551 so as to obtain a horizontal line slightly lit
(it's advisable to operate in low environmental lighting conditions).
Keeping as reference the colour of the prevailing electron gun of this
line, accurately adjust black-level potentiometers of the other two
electron guns (P105 for red, P107 for green, P109 for blue) until the
horizontal line is perfectly white.
Adjust P551 up to the point in which the white line,fades out
(cut-OFF).
Reconnect SW501.
If a predominance of a colour is noticeable on the screen, eliminate
it by re-adjusting the black-level potentiometer of the relevant
electron gun involved.
Fig. 4
1 7 0 V D C
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