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EN 144
8.
3. Alignment is correct when the DC-voltage is just below 3.8
V.
Blend Intensity
Use this alignment when the micro controller or HOP-IC has
been replaced.
It aligns the level of transparency of the menu-picture blended
into the main-picture.
1. Position the BRIGHTNESS-, CONTRAST- and COLOUR
setting in the middle position (picture-menu).
2. Apply a signal with a 100 % white video-pattern.
3. Connect an oscilloscope to pin 7 of connector 0340 of the
CRT panel and measure the Red output level.
4. Align 'blending intensity'-parameter such, that the blended
signal is 65 % of the black-white amplitude. Practically this
will be about 1.3 V (blended signal) versus 2 V (full white
signal). The parameter is adjustable between 0 and 31.
Adjust Peak White Limiter
Enter for all picture tubes the value '4'.
Vg2 Test Pattern
Here, you can activate the Vg2 Test pattern. See paragraph
'Hardware Alignments' for a description.
VDS/PIP (optional)
With this adjustment, you can set the following parameters
(which are stored in the local memory IC7991):
•
IF AFC. This alignment is identical to the one described
above.
•
Tuner AGC. See description below:
1. Supply a video signal, with a frequency of 475.25 MHz
and a signal-strength of about 2 mV to the set.
2. Measure the DC-voltage on pin 1 of the tuner 1102
(easiest way is to measure on SMD capacitor C2116,
just underneath the tuner).
3. Align the voltage via the menu. The alignment is
correct when the DC-voltage is just below 3.8 V
8.4.2
Normal Geometry
Note: Use for all geometry alignments an external pattern
generator with a geometry pattern (e.g. crosshatch).
Geometry Alignments
1
2
3
4
5
6
7
8
9
10
11
12
Figure 8-7
MG3.2E
Electrical Alignments
VERT. SLOPE
VERT. SHIFT
VERT. AMPLITUDE
V.S-CORRECTION
HOR. SHIFT
HOR. AMPLITUDE
E/W PARABOLE
UPPER E/W CORNER
LOWER E/W CORNER
E/W TRAPEZIUM
HOR. PARALLELOGRAM
HOR. BOW
CL 16532044_022.eps
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Vertical Slope
This alignment is meant to align the zero crossing of the frame-
deflection to the mechanical middle of the picture tube.
1. First set the start conditions for 16:9 sets: 'V. S-correction'
value on '0' for the 28" sets, and '9' for the 32" and 36" sets.
Position the boundary-stripes of the test pattern on the
edges of the picture tube.
2. Align 'V. slope' (during alignment the below-half of the
picture is blanked). Match the middle line of the test pattern
with the upper edge of this blanking picture. Push the
MENU button again, to return to the previous menu.
Service tip: When the set is equipped with a rotation coil, use
this menu item to check its correct alignment. If alignment is not
correct, go to the INSTALLATION menu, choose SETUP,
press OK, and choose PICTURE TILT. With the use of a
crosshatch test pattern, align it to a correct horizontal picture.
Vertical Amplitude and Centring
1. Use 'V. amplitude' to align the vertical amplitude so that
the entire test pattern is visible.
2. Use 'V. shift' to align the picture vertically in the middle.
3. Repeat the 'V. amplitude' alignment if necessary.
Vertical S-correction
Align 'V. S-correction' such that a block at the top of the picture
has the same height as a block in the middle of the picture.
Horizontal amplitude and centring
1. Use 'H. amplitude' to align the horizontal amplitude so that
the entire test pattern is visible.
2. Use 'H. shift' to align the picture horizontally in the middle.
3. Repeat the 'H amplitude' alignment if necessary.
Note: If you cannot compensate the drift in the horizontal shift,
go to the next subject 'DC-shift'.
DC-shift
In case the horizontal linearity in wide-screen mode is out of
tolerance, add a 'DC-shift correction' panel (3104 328 00641)
to connector 0393 on the LSP (see figure below).
Caution: Be sure to switch 'off' the set first. On this DC-shift
panel, cut position 9031 for correction to the right or cut position
9030 for correction to the left.
Caution: never plug in a not pre-aligned module in a set !!!
DC-shift Connector
0393 (DC-shift)
LOT
Focus
Screen
VG2
Figure 8-8
In 32" and 36" sets, an adjustable DC-shift feature is always
present. This is located on the DAF panel (potentiometer
3050). How to align:
CL 16532149_078.eps
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