Philips 202P4, Service Manual

Page: 25 / 121

25
202P4 M25P
Electrical Adjustments (Continued)
8.9 Store the preset results by selecting the "exit" (OSD
control).
8.10 Repeat the procedure 8.1 to 8.9 until all the preset
timings have been adjusted completely
: Apply a video signal in the 1024 x 768 with 69 kHz/85 Hz
mode
: Select " @ " pattern.
: Set the brightness at center (50%) and the contrast to 22
FL.
: Adjust focus potentiometers (top of L.O.T.) Focus 1 for
horizontal focus and Focus 2 for vertical focus so that the
picture at 2/3 of the diagonal lines (from center to four
corners) of the displayed screen is as sharp as possible.
9. Focus adjustment
7.6 : Select the 6500K colour temperature as shown in Fig.
2.2.
: Adjust the R/G/B cutoff and R/G/B gain as shown in
procedure 7.2~7.3 to get
R/G/B cutoff x= 0.313 +/- 0.015
y= 0.329 +/- 0.015
R/G/B gain x= 0.313 +/- 0.015
y= 0.329 +/- 0.015
Y= 30 +/- 1 Ft-L(Adjust Sub-contrast
control (OSD))
7.7 : Select the 5500K colour temperature as shown in Fig.
2.2.
: Adjust the R/G/B cutoff and R/G/B gain as shown in
procedure 7.2~7.3 to get
R/G/B cutoff x= 0.332 +/- 0.015
y= 0.347 +/- 0.015
R/G/B gain x= 0.332 +/- 0.015
y= 0.347 +/- 0.015
Y= 27 +/- 1 Ft-L(Adjust Sub-contrast
control (OSD))
djust
- Apply a video signal with cross-hatch pattern.
- Apply a video signal in the 1024 x 768 with 69 kHz/85 Hz
mode.
- Set brightness and contrast controls to their center positions
(OSD control).
8. Picture geometry setting (factory pre-set modes)
8.1 Horizontal geometry (OSD control)
- Adjust the H-width to 392 mm
- Adjust the H-phase to center position.
8.2 Vertical geometry (OSD control)
- Adjust vertical size to 294 mm
- Adjust V-phase to center position.
8.3 Trapezoid distortion (OSD control)
- Adjust the trapezoid to get optimal vertical lines.
8.4 Pincushion (OSD control)
- Adjust the pincushion to get optimal vertical line.
7.8 : Apply a small white square pattern , adjust SRGB color
temperature to match with 6500K color temperature
and a
Sub-contrast(OSD) reach to ( 23 +/-1 ft-lb )
8.5 Parallelogram (OSD control)
- Adjust parallelogram so that vertical lines are vertical or
symmetrically about the center vertical axis.
8.6 Unbalance-pin (OSD control)
- Adjust the unbalance-pin so that that vertical border lines
are aligned symmetrically.
8.7 Rotation (OSD control)
- Adjust picture so that vertical tilt is less than +/- 0.5mm.
8.8 Top/Bottom corner(control)
- Adjust the top/bottom corner control to get optimum corner
geometry.
9
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