Philips 202P70/00 Service Manual page 8

8 202P7 CRT
Go to cover page
Factory timing modes table
Timing Horizon Vertic
table tal al
No. frequen freque
cy KHz ncy
Hz
1 31.469 59.941
2 31.469 70.087
3 37.500 75.000
4 37.861 72.809
5 37.879 60.317
6 43.269 85.008
7 46.875 75.000
8 48.077 72.188
9 48.363 60.004
10 49.725 74.550
11 50.600 100.10
0
12 53.674 85.061
13 56.476 70.069
15 60.023 75.029
16 63.900 100.10
0
17 63.981 60.020
18 68.667 84.997
19 68.681 75.062
22 75.000 60.000
23 79.976 75.025
24 81.250 65.000
25 83.640 60.000
27 86.333 59.995
28 87.500 70.000
29 90.000 60.000
30 91.146 85.024
31 93.750 75.000
32 106.250 85.000
33 106.270 74.997
34 112.500 75.000
14 119.935 85.000
35 120.450 75.000
26 120.560 80.000
20 124.185 85.000
21 128.520 85.000
36 130.000 80.000
Remark: The alignment result DAC values mentioned in following
items (8.2.15 to 8.2.21)are pincushion, balanced, trapezoid,
parallelogram, corner top and corner bottom.
8.2.15 Copy the alignment result DAC values of alignment mode
timing table No. 9 into preload mode timing table No. 8, 7,
6, 5, 4, 3, 2 and 1.
8.2.16 Copy the alignment result DAC values of inspection mode
timing table No. 15 into preload mode timing table No. 13,
12, 11and 10.
8.2.17 Copy the alignment result DAC values of inspection mode
Electrical Instructions
Resolution Remark
640x480 Preload mode
720x400 Preload mode
640x480 Preload mode
640x480 Preload mode
800x600 Preload mode
640x480 Preload mode
800x600 Preload mode
800x600 Preload mode
1024x768 Alignment
mode for
preloading
832x624 Preload mode
640x480 Preload mode
800x600 Preload mode
1024x768 Preload mode
1024x768 Inspection
mode 1
800x600 Preload mode
1280x1024 Preload mode
1024x768 Inspection
mode 2
1152x870 Preload mode
1600x1200 Preload mode
1280x1024 Inspection
mode 3
1600x1200 Preload mode
1792x1344 Preload mode
1856x1392 Preload mode
1600x1200 Preload mode
1920x1440 Preload mode
1280x1024 Inspection
mode 4
1600x1200 Inspection
mode 5
1600x1200 Inspection
mode 6
1792x1344 Inspection
mode 7
1920x1440 Inspection
mode 8
1792x1344 Preload mode
2048x1536 Alignment
mode for
fixing the
position of H
raster
1792x1344 Preload mode
1856x1392 Preload mode
1920x1440 Inspection
mode 9
2048x1536 Preload mode
timing table No. 18 into preload mode timing table No. 17
and 16.
8.2.18 Copy the alignment result DAC values of inspection mode
timing table No. 23 into preload mode timing table No. 22
and 19.
8.2.19 Copy the alignment result DAC values of inspection mode
timing table No. 30 into preload mode timing table No. 29,
28, 27, 25, and 24.
8.2.20 Copy the alignment result DAC values of alignment mode
timing table No. 35 into preload mode timing table No. 14.
8.2.21 Copy the alignment result DAC values of inspection mode
timing table No. 21 into preload mode timing table No. 20,
26 and 36.
8.2.22 Fill up all alignment result DAC values with FF (hex-decimal)
into 16 new modes. (addresses in EEprom A2 page 80H to
C7H & A4 page 00H to FFH, refer to sheet-140 18 of 30 & 19
of 30.)
9. Focus adjustment
9.1 Apply "ME" pattern shown at FIG-7 with timing 91.146 KHz
1280 X 1024 / 85Hz. Set brightness at 50% and contrast
100% at the center of the screen.Preload the DAC values of
H-focus to 0 and V-focus to 185 in the factory mode.
Adjust focus potmeters (F1& F2) which are located on fly-back
transformer together with OSD V-focus (dynamic) in factory
mode, until the haze just disappear on 2/3 east and west, top
and down of the screen.
After the adjustment the focus performance should be confirmed
at higher resolution mode - 106.5KHz/85Hz 1600X1200.
10. ADJUSTMENT AND TOUCH-UP FOR
MISCONVERGENCE
Apply a cross-hatch pattern @ 69kHz/85Hz, adjust the
H- convergence and V-convergence to get the best static
convergence. Although CRT makers provide the CRT with
mis-convergence 0.25 mm or better in zone A, and 0.35mm
or better in zone B (see Fig.6), the static convergence varies
with focusing location or deviation from chassis,slight
correction is sometimes required for static convergence to
meet required product specification (same as Fig.6). This
correction is to be made by re-adjusting the multi-pole
magnets or some controls on the CRT yoke to get the best
convergence at the center of the screen. Some spoilers
may be added to improve some local mis-convergence.
11. PRESET FOR MOIRE CONTROL
For horizontal moire functions, the preset value should
be adjusted to '0' to all 36 preset and preload modes.
12 Loading DDC code
The DDC HEX data (refer sheet 190) should be written
into the IC 7336 via MCU(7301), or DDC IC (7491)
optionally by EEPROM writer or equivalent method.
13 justment of purity
To place the monitor face east @ magnetic field as 5.4
described, and set the user control value of the N/S to
50%, apply a full red (or 5-mosaic red) pattern with standard
display size @ 69kHz / 85Hz mode, the monitor should be
degaussed well before adjustment, the degaussing method
should accord to 7.1.2 described if external degaussing is
necessary, then use a landing meter LND-070 or equivalent
to adjust the purity to get best landing 0 +/- 2 micrometers.