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CUT OFF AND SCREEN ADJUSTMENT
PREPARATION
(i)
(ii
Preset the red, green and blue background controls on the C.R.T. base to the positions shown. (Approximately mid. point).
Component Side
Set the customer controls as follows:-
Contrast = 0
Colour =
0
Brightness = middle of scale
(iii) Receive horizontal white line, or red raster pattern from a Philip's pattern generator.
METHOD:
1.
Adjust screen control (lower control on the flyback transformer) until the horizontal line is just visible and its colour can be
seen.
2.
Do not touch the background
control of the colour that is most prominent on the screen, but adjust the other two
background controls until a reasonable white line is obtained
Connect an oscilloscope probe to each of the R.G.B. cathodes in turn and leave connected to the one with the highest level.
4.
Set customer brightness so that the cathode value is no greater than 140v as shown below.
Peak white
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5.
Disconnect oscilloscope, and set screen control so that the white horizontal line is just visible once more.
WHITE BALANCE
PREPARATION:
(i)
(ii)
Set the customer controls as follows:-
Contrast = 0
Colour =
0
Receive the white raster pattern.
(iii) Obtain and set up a combined colour analyser and light meter, e.g. MINOLTA CA100.
METHOD:
1.
Adjust brightness customer control so that the light output from the white raster reads Y = 1 —
2 cdm'* on the light
meter.
Next adjust the red and blue background controls to obtain the colour chromaticity co-ordinates of x = 283
y = 299
representing a colour temperature of 9300k (models C, CS and CP/481/381).
For colour temperature of 7400k the red and blue background controls will have to be adjusted to obtain the colour
chromaticity co-ordinates of x = 304 y = 320 (for all CP models other than shown above).
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