Philips EM5E AA Service Manual page 100

EN 100 8.
8.3.5 Geo-Nor (Normal Geometry)
Note: Use for all geometry alignments an external pattern
generator with a geometry pattern (e.g. crosshatch).
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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 '8' for the 28", '26' for the 29", '16' for the 32", or
'20' for the 36" 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'.
EM5E 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
3. Connect a voltmeter (V
ground.
4. Adjust the DC voltage to '0' with potmeter R3642 (see
figure 8-1).
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 Parallelogram' to align for straight vertical
lines if necessary.
6. Use 'Horizontal Bow' to correct the E/W parabola such, that
it becomes symmetrical.
Repeat steps 1 to 6 if necessary.
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 'normal geometry'
alignment.
2. 'H. amplitude', enter value of 'normal geometry' alignment
subtracted by '1'.
3. 'East/west Parabola', enter value of '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 '100Hz Geometry'. 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.
) between R3624 and 'hot'
DC