Philips 28PW9528, Руководство по обслуживанию

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Electrical Alignments
EN 105 EM5.1E 8.
5.
After adjustment, STORE the value.
6.
Now return to the user "Installation" menu.
7.
Select "Manual Installation" - "Search" - "475" - "OK" and
"Store". This will set the AFC "ON" again.
Service tip: If you do not trust the frequency accuracy of your
service generator, connect it to a "good" TV set and check it
with the "Fine tune"-line.
IF LPRIME AFC
Use the same procedure as for the IF AFC alignment, but set
the video generator to SECAM L/L' (only necessary for
countries that have or can receive this system).
TUNER AGC
1.
Set the external pattern generator to a colour bar video
signal and connect the RF output to the aerial input. Set the
amplitude to 10 mV and set the frequency to 475.25 MHz.
2.
Connect a DC multimeter between pin 1 and the shielding
of the Tuner (item 1200 on the LSP).
3.
Adjust the TUNER AGC value (default value is 25) with the
LEFT/RIGHT cursor keys until the voltage at pin 1 of the
tuner lies between 3.8 and 2.3 V.
4.
STORE the alignment.
TUNER AGC TUNER 2
Use the same procedure as described above (under TUNER
AGC) with the set switched to the DW source. Measure on pin
1 of the DW Tuner (this is only applicable for sets with 2-tuner
DW execution).
BLEND INTENSITY
Use this alignment when you replace the microcontroller or the
HOP. It aligns the level of transparency of the menu-picture
blended into the main-picture.
Position the "BRIGHTNESS", "CONTRAST", and "COLOUR"
setting in the middle position (picture-menu).
1.
Apply a signal with a 100 % white video-pattern.
2.
Connect an oscilloscope to pin 8 of connector 1298 of the
CRT panel and measure the Red output level.
3.
Align the BLEND INTENSITY parameter such, that the
blended signal is 65 % of the black-white amplitude. In
practice, this is about 1.3 V (blended signal) versus 2 V (full
white signal).
4.
The parameter can be adjusted in between "0" and "31".
8.3.3
DRIVE
Method 1 (with colour analyser):
1.
Select TEST PATTERN and turn it ON. During the
following alignments, you will get a white block in middle of
the screen.
2.
Select CATHODE and adjust the set to the correct light
output. This setting depends on the picture tube size and
brand. See table "Cathode parameter" for the colour
analyser readings.
3.
Select a COLOUR TEMPERATURE (COOL, NORMAL, or
WARM).
4.
Adjust the white level (via RED, GREEN, and BLUE)
according to the values in table "White levels".
Table 8-2 Cathode parameter
Table 8-3 White levels
Method 2 (without colour analyser):
Without having a colour-analyser, one can set some
parameters. This is the next best solution. The setting-
parameters are average values coming from production
(statistics).
1.
Select CATHODE and enter the value "15" (for all picture
tubes).
2.
Select a COLOUR TEMPERATURE (COOL, NORMAL, or
WARM).
3.
Set the RED, GREEN, and BLUE parameters according to
the (delta) values in table "Tint settings".
4.
RED BL OFFSET: herewith the black level can be aligned
very precise (default value is "7").
5.
GREEN BL OFFSET: herewith the black level can be
aligned very precise (default value is "7").
Table 8-4 Tint settings
8.3.4
LUM. DEL. (Luminance Delay)
With this alignment, you place the luminance information
exactly on the chrominance information (brightness is pushed
onto the colour). Use a colour bar/grey scale pattern as test
signal.
•
LUM. DELAY PAL BG: Apply a PAL BG colour bar/grey
scale pattern as a test signal. Adjust this parameter until
the transients of the colour part and black and white part of
the test pattern are at the same position. Default value = 9.
•
LUM. DELAY PAL I: Apply a PAL I colour bar/grey scale
pattern as a test signal. Adjust this parameter until the
transients of the colour part and black and white part of the
test pattern are at the same position. Default value = 9.
•
LUM. DELAY SECAM: Apply a SECAM colour bar/grey
scale pattern as a test signal. Adjust this parameter until
the transients of the colour part and black and white part of
the test pattern are at the same position. Default value =
11.
•
LUM. DELAY BYPASS: apply a NTSC colour bar/
greyscale pattern as a test signal. Adjust this value until the
transients of the colour and black & white part of the test
area are at the same position. Default value = 10.
8.3.5
GEO-NOR (Normal Geometry)
Note: Use for all geometry alignments an external pattern
generator with a geometry pattern (e.g. crosshatch).
CRT Light output (cd/m
2
)
28" RF WS 400 (Mk1), 450 (Mk2)
29" RF 4:3 400
32" RF WS 380 (LPD), 370 (MEC)
36" RF WS 330
ColourTemp.
(K)
Cool
(10200)
Normal
(8700)
Warm
(6500)
X 280 289 313
Y 287 299 329
∆
Cool Normal
∆
Warm
R -1 37 +3
G 0 30 0
B +4 31 -10