Philips EM6E Service Manual page 102

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Figure 8-9 Geometry Alignments
"Geo-Nor" stands for Normal Geometry, and is aligned in Pixel
Plus mode (at 75 Hz).
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 user menu, choose SETUP, GENERAL, and
TILT ADJUST. With the use of a crosshatch test pattern, align
it to achieve a correct horizontal picture.
V. SLOPE
Aligns 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 "16" for the 28 inch, "18" for the 32
inch, or "20" for the 36 inch sets.
2. Align V. SLOPE (during alignment, the lower half of the
picture is blanked) so that the middle line of the test pattern
is matched with the edge of the pattern transient in the
middle of the picture.
3. Repeat the alignment if necessary.
V. SHIFT AND V. AMPLITUDE (vertical alignment)
Aligns the vertical centre and height of the picture.
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
140501
8.3.5
8.3.6
EM6E AB
1. Use V. AMPLITUDE to align the vertical amplitude so that
the entire test pattern is visible.
2. Set V. SHIFT to a value of 32.
3. Connect a voltmeter (V_dc) between R3642 and "hot"
ground.
4. Adjust the DC voltage to 0 with potmeter R3642 (see figure
"Top view LSP").
5. Use V. SHIFT again to align the test pattern roughly
vertically in the middle of the screen.
6. Repeat the alignment if necessary.
V. S-CORRECTION
Aligns for equal size squares on the top, middle, and bottom of
the picture tube.
•
Align V. S-CORRECTION so that the squares at the top (or
bottom) of the picture are the same height as the squares
in the middle of the picture.
H. SHIFT AND H. AMPLITUDE (horizontal alignment)
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 the horizontal linearity in wide-screen mode is out of
tolerance, add a "DC-shift correction" panel (3104 328 06230)
to connector 1419 of the DAF-panel [diagram I]. On the DC-
shift panel, cut diode 6433 for correction to the right or diode
6432 for correction to the left.
Caution: Be sure to switch the set "off" first. Never plug in
"not aligned" DC-shift module in a working TV-set!
EAST/WEST ALIGNMENT
1. Use EAST/WEST PARABOLA to align the vertical lines
until they are straight.
2. Use UPPER EAST/WEST CORNER to align the vertical
lines in the upper corners of the screen until they are
straight.
3. Use LOWER EAST/WEST CORNER to align the vertical
lines in the lower corners of the screen until they are
straight.
4. Use EAST/WEST TRAPEZIUM to align for a rectangular
picture.
5. Use HORIZONTAL BOW to correct the E/W parabola so
that it is symmetrical.
6. Use HORIZONTAL PARALLELOGRAM to align for straight
vertical lines if necessary.
Repeat steps 1 to 6 if necessary.
GEO-4:3
"Geo-4:3" stands for 4:3 geometry alignment in 16:9 sets and
is aligned in Pixel Plus mode (at 75 Hz).
1. Use EAST/WEST PARABOLA to align the vertical lines
until they are straight.
2. Use UPPER EAST/WEST CORNER to align the vertical
lines in the upper corners of the screen until they are
straight.
3. Use LOWER EAST/WEST CORNER to align the vertical
lines in the lower corners of the screen until they are
straight.
GEO-SW
"Geo-SW" stands for Super Wide geometry alignment in 16:9
sets and is aligned in Pixel Plus (at 75 Hz).
You only need to set the following values (if the normal
geometry alignment has been performed correctly):
1. V. S-CORRECTION, enter the value of the normal
geometry alignment.
8. EN 141