Picture Settings; Dynamic Convergence; Colour Purity; Static Convergence - Philips CM11342 Service Manual

2. PICTURE SETTINGS
Remarks:
- The following adjustments only apply to monitors
which are fitted with a replaceable deflection unit.
- In case of combi tube replacement, no picture settings
are required because it has been done by factory
already
- The colour purity and convergence adjustments
described hereafter need only to be carried out if a
completely new setting is required or if a new picture
tube has been fitted. In other cases, for example after
replacing the deflection unit, it will not usually be
necessary to remove the rubber wedges (G in figure
3). Corrections by means of the multi-pole unit will
then suffice.
- Focusing adjustment described in item 1 .5 must be
done prior to picture settings.
2.1 Colour purity, see figure 3
- Unscrew the fixing screw "F" on the deflection unit.
Move the deflection unit and remove the three rubber
wedges "G".
Move the deflection unit forward as far as possible
against the glass of the picture tube cone and tighten
fixing screw "F" so that the deflection unit can only be
shifted slightly.
Place the multi-pole unit in the position drawn: tighten
screw "A" and turn locking ring "B" anticlockwise.
Position the monitor to face east or west and switch it
on. Apply a cross-hatch pattern and set the
brightness control to maximum. Allow the monitor to
warm up for ten minutes.
Adjust the static convergence using tags "C" and "D"
(if necessary, refer to point 2.2.).
Turn 3583 for the vertical centering to its
mid-position. Switch off the green and blue guns by
disconnecting resistors 3122 and 3112.
By turning the colour purity rings with the "E" tags, the
vertical red bar is brought as close as possible to the
center of the screen, while the central horizontal line
should be as straight as possible.
Apply a white pattern signal and check that the red
bar is in fact in the center of the screen. If not, switch
on the cross-hatch pattern again and move the red
bar in the right direction, ensuring that the picture
does not move too much in the vertical direction.
Apply the white pattern signal and move the deflection
unit until the whole picture surface is uniformly red.
Switch on the green and blue guns. There may be no
colour patches in the white picture now obtained. If
there are, a minor correction can be made by turning
the colour purity rings "E" slightly and{or moving the
deflection unit slightly.
Tighten screw "F" securely.
Adjust the vertical centering with 3583.
Proceed to the static and then the dynamic
convergence setting.
2.2 Static convergence, see figure 3
- Apply a cross-hatch pattern and allow the monitor to
warm up for ten minutes.
- Switch off the green gun by disconnecting resistor
3122 and turn locking ring "B" anticlockwise.
- By turning the four-pole rings with the "C" tags the
red and blue cross-hatch patterns are placed on top
of each other in the center of the screen.
- Switch on the green gun by connecting resistor 3122
back to its orginal position and switch off the blue gun
by disconnecting 3112.
- By turning the six-pole rings with the "D" tags the red
and green patterns are placed on top of each other in
the center of the screen.
- Switch on the blue gun by connecting resistor 3112
back to its orginal position and tighten ring "B".
cs
30 397
2.3 Dynamic convergence
Remark:
The dynamic convergence is achieved by tilting the
deflection unit vertically and horizontally. In order to fix
the deflection unit in the right position, three rubber
wedges are fitted between the glass of the picture tube
cone and the deflection unit, as shown in fig. 4d or 5d.
Two wedge thicknesses are available, one 7 mm thick,
code number 4822 462 40356 and the other 11 mm thick,
code number 4822 462 40357.
- First check the colour purity and the static
convergence.
- Apply a cross-hatch pattern and switch off the green
gun by disconnecting resistor 3122.
- Eliminate the crossing of the central horizontal blue
and red line and the crossing of the central vertical
blue and red line by vertically tilting the deflection unit.
If the deflection unit is in the correct position, then
place rubber wedge
(D,
without removing the paper
strip, at the top (figure 4a) or at the bottom (figure 5a).
Figure 4a applies when the unit is tilted upwards and
figure 5a applies when the unit is tilted downwards.
- Through the horizontal tilting of the deflection unit,
both the horizontal blue and red lines in the upper and
lower halves of the picture and the vertical blue and
red lines on the left and right-hand side of the picture
are placed on top of each other.
If the deflection unit is in the correct position, then
place the wedges
®
and
@ ,
remove the paper
strips and firmly press the adhesive side of these
wedges against the glass of the picture tube as
shown in figure 4b or 5b.
Now place wedge
@
as shown in figure 4c or
5c,remove the paper strip and firmly press the
adhesive side of this wedge against the glass of the
picture tube cone.
Remove wedge
CD
so that the situation according to
figure 4d or 5d arises.
- Switch on the green gun by connecting resistor 3122
back to its original position.