Philips EM5E, Service Manual, Page: 99 / 136

Electrical Alignments EN 99 EM5E 8.
Table 8-1 OSD feedback of AFC alignment
1.
The first item ('In' or 'Out') informs you whether you are in
or out the AFC-window.
2. The second item ('High' or 'Low') informs you about
whether the AFC-frequency is too high or too low.
3. First you must align the 'IF AFC'-parameter such that you
come into the AFC-window (= 'In')
4. Then you must look for the point where the 'IF AFC'-
parameter changes from 'High' to 'Low'. This level is the
value you are looking for.
5. After adjustment, 'Store' the value.
6. Now return to the '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.
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 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 6).
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 (default value = 11 for all).
•
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.
• 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.
• 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.
• 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.
AFC-window AFC-frequency vs. reference
Out High
In High
In Low
Out Low
CRT Light output (cd/m
2
)
28" RF WS 400
29" RF 4:3 400
32" RF WS 380
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