Philips L06.1E AA Service Manual page 60

EN 60 8.
8.2.2 Focus alignment
The LOT has the following outline:
– Focus 1 (F1) = Static alignment (red wire).
– Focus 2 (F2) = Dynamic alignment (white wire).
1. Use an external video pattern generator to input a "circle"
or "crosshatch" test pattern to the set.
2. Choose "Natural" picture mode with the "Smart Picture"
button on the remote control transmitter.
3. Adjust the "dynamic focus 2" potentiometer (in the middle
on the LOT) until the horizontal lines at the centre of the
screen are of minimum width without introducing a visible
haze.
4. Adjust the "static focus 1" potentiometer (highest of the
LOT) until the horizontal lines at the sides of the screen are
of minimum width without introducing a visible haze.
5. Repeat these two steps to achieve the best result.
8.3 Software Alignments
Put the set in the SAM (see the "Service Modes, Error Codes
and Fault Finding" section). The SAM menu will now appear on
the screen. The different alignment parameters are described
further on.
Notes:
• All changes to menu items and alignments must be stored
manually.
• If an empty EAROM (permanent memory) is detected, all
settings are set to pre-programmed default values, so the
set must be re-aligned.
8.3.1 Tuner
AGC
1. Set an external pattern generator to a colour bar video
signal and connect the RF output to the aerial input of the
TV. Set the amplitude to 10 mV and the frequency to
475.25 MHz. Use system PAL B/G if possible, otherwise
match the system of your generator with the received
signal in the set.
2. Put the set in the SAM mode.
3. Select via the TUNER menu, the AGC sub-menu.
4. Connect a DC multi-meter to pin 1 of the tuner (F235, AGC
pin).
5. Adjust the AGC until the voltage at pin 1 (F235, AGC pin)
of the tuner is 3.3 V (+/- 0.1 V). The value can be
incremented or decremented by pressing the right/left
CURSOR button on the RC.
6. After alignment, save the value(s) with the STORE
command in the SAM main menu.
IF PLL OFFSET
No adjustments needed: default value (which can not be
changed) is "0".
8.3.2 Geometry
Notes:
• Set an external pattern generator to a crosshatch video
signal and connect the RF output to the aerial input of the
TV. Set the amplitude at least 1 mV
frequency to 475.25 MHz. Use system PAL B/G if possible,
otherwise match the system of your generator with the
received signal in the set.
• Use the default alignment settings, but set "Brightness" to
"32".
• For wide screen models, set to "wide screen" mode, for
"classic" models, set to "4:3".
• After alignment, save the value(s) with the STORE
command in the SAM main menu.
L06.1E Alignments
(60 dBµV) and the
RMS
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 user MENU, choose FEATURES, and select
ROTATION. With the use of a crosshatch test pattern, align it
to a correct horizontal picture.
Alignment
1
2
3
4
5
6
7
8
9
10
11
12
Figure 8-3 Geometry Alignments
Select "Pixel Plus" mode and put a test picture on the screen.
Use the following software regulations to modify the vertical
parts of the screen geometry (see Figure "Geometry
Alignments" for a general idea of what you should see on the
screen):
1. VSH (Vertical Shift): Align for the vertical picture centre,
range from 0 to +63.
2. VAM (Vertical Amplitude): Compensating for any gain error
in amplifier, adjust range from 0 to +63 to the proper
amplitude.
3. VSC (Vertical S-Correction): Align for equal height of the
blocks in the top, the bottom and the middle, range from 0
to +63.
4. VS (Vertical Slope). First activate menu item SBL (Service
Blanking = ON), so the lower part of the test picture is no
longer visible. Then adjust the Vertical Slope. Align for the
horizontal line in the middle of the test picture to line up with
the boundery between the (still visible) upper part of the
screen and the (invisible) lower part of the screen. Range
from 0 to +63. After this, switch the SBL to OFF again.
Next, align the following horizontal screen geometry settings:
1. HSH (Horizontal Shift): Adjust for the horizontal centre of
the screen, range from 0 to +63.
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
E_06532_010.eps
110204