Philips EM5.1E Service Manual page 106

EN 106 8.
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Figure 8-3 Geometry Alignments
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.
V. SLOPE
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 "16" for the 28 inch, "32" for the 29
inch, "16" for the 32 inch (LPD - Philips tube), "27" for the
32 inch (MEC - Panasonic tube), or "20" for the 36 inch
sets. Position the boundary-stripes of the test pattern on
the edges of the picture tube.
2. Align V. SLOPE (during alignment, the lower half of the
picture is blanked) such, 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)
Align the vertical centre and height of the picture.
1. Use V. AMPLITUDE to align the vertical amplitude so that
the entire test pattern is visible.
2. Set V. SHIFT to value "32".
3. Connect a voltmeter (V_dc) between R3624 and "hot"
ground.
4. Adjust the DC voltage to "0" with potmeter R3642 (see
figure 8-1).
Electrical Alignments
EM5.1E
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
5. Use V. SHIFT again to align the test pattern roughly
vertically in the middle.
6. Repeat the alignment if necessary.
V. S-CORRECTION
Align for equal blocks on top, middle, and bottom of the picture
tube.
Align V. S-CORRECTION such that a block at the top (or
bottom) of the picture has the same height as a block 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: In case 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 "OFF" the set first. Never plug
in a not pre-aligned module in a playing set!
EAST/WEST ALIGNMENT
1. Use EAST/WEST PARABOLA to align the vertical lines
until straight.
2. Use UPPER EAST/WEST CORNER to align the vertical
lines in the upper corners until straight.
3. Use LOWER EAST/WEST CORNER to align the vertical
lines in the lower corners until straight.
4. Use EAST/WEST TRAPEZIUM to align for a rectangular.
5. Use HORIZONTAL BOW to correct the E/W parabola
such, that it becomes symmetrical.
6. Use HORIZONTAL PARALLELOGRAM to align for straight
vertical lines if necessary.
Repeat steps 1 to 6 if necessary.
140501
8.3.6
GEO-4:3 (4:3 geometry alignment in 16:9 sets)
1. Use EAST/WEST PARABOLA to align the vertical lines
until straight.
2. Use UPPER EAST/WEST CORNER to align the vertical
lines in the upper corners until straight.
3. Use LOWER EAST/WEST CORNER to align the vertical
lines in the lower corners until straight.
8.3.7
GEO-SW (Super Wide geometry alignment in 16:9 sets)
You only need to set the following values (if the normal
geometry alignment has been performed correctly):
1. V. S-CORRECTION: enter value of the NORMAL
GEOMETRY alignment.
2. H. AMPLITUDE: enter value of the NORMAL GEOMETRY
alignment subtracted by "1".
3. EAST/WEST PARABOLA: enter value of the NORMAL
GEOMETRY alignment.
8.3.8
GEO-100HZ (Digital Scan geometry alignment)
As all alignments are done in Pixel Plus mode (at 75 Hz), the
100 Hz mode needs an extra alignment:
•
Select GEO-100HZ. The set automatically switches to 100
Hz mode.
•
V. SLOPE: match the middle line of the test pattern with the
upper edge of this blanking picture.
•
After the alignment, return to the previous menu. The set
automatically returns to "Pixel Plus" mode.