Alignments
8.
Figure 8-2 Waveform Vg2 alignment
8.2.2
Focus Alignment
Notes:
•
Use an external video pattern generator to input a “circle
with crosshatch” test pattern to the set.
•
Choose "MOVIES" picture mode with the "PICTURE"
button on the remote control transmitter.
•
ELDOR LOT outline:
–
Focus 1 (F1) = Static alignment (black wire.)
–
Focus 2 (F2) = Dynamic alignment (red wire.)
Focus method
1.
Start with the STATIC and DYNAMIC focus potentiometers
on the LOT at the mid point.
2.
Adjust the STATIC focus until the vertical lines at 1/4 of the
screen from the left and right sides of the screen, at the
horizontal center of the screen, are of minimum width
without visible haze.
3.
Adjust the DYNAMIC focus until the horizontal line at the
center of the screen is of minimum width without visible
haze.
4.
Check overall spot performance and repeat steps 2 and 3
to achieve the best result: a compromise between minimal
visible haze at the middle of the screen and sharp lines at
the edges of the screen.
8.3
Software Alignments
8.3.1
Introduction
With the software alignments, it is possible to align the Tuner
IF, White Tone, and Geometry settings.
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. Menu navigation is performed with the “MENU UP,
DOWN, LEFT and RIGHT” keys of the remote control (RC)
transmitter.
Notes:
•
All changes to menu items and alignments are stored
automatically, except changes to the option codes. They
must be stored manually.
•
If the Option codes have been changed and stored, the set
has to be disconnected from AC power; if the television is
only turned 'off' with the Power switch, the option code
settings are NOT read by the microprocessor.
•
If an empty EAROM (permanent memory) is detected, all
settings are set to preprogrammed default values.
8.3.2
Tuner IF
IF PLL OFFSET
Set the external pattern generator to a colour bar video signal
and connect the RF output to aerial input. Set amplitude to 10
mV and set frequency to 475.25 MHz (PAL/SECAM) or 61.25
MHz (NTSC).
Alignment procedure:
1.
Set the pattern generator to a color bar video signal and
connect the RF output to aerial input. Set amplitude to at
least 1mV.
2.
Enter the SAM mode and select 'Tuner.'
3.
Align the 'IF PLL OFFSET' parameter so that you come into
the AFC window, meaning that the AFB value must be on
the transient of going from 1 to 0 (see table below, which
explains the best way of aligning).
4.
After this alignment, store the value by returning to the
previous menu (via the MENU/SELECT key).
5.
Exit the SAM mode by pressing the 'POWER' button on the
remote control transmitter.
Table 8-1 IF PLL Offset alignment
AGC
1.
Connect the RF output of a video pattern generator to the
antenna input. From the generator, input an NTSC TV
signal with a signal strength of approximately 2 mV and a
frequency of 475.25 MHz (PAL/SECAM) or 61.25 MHz
(NTSC).
2.
Enter SAM mode, select 'Tuner,' and activate the 'AGC'
line in the sub menu.
3.
Connect a DC multimeter to pin 1 of the tuner (item 1200
on LSP).
4.
Adjust the AGC until the voltage at pin 1 of the Tuner is just
below 3.8V.
5.
Increase/decrease the value by pressing the MENU LEFT/
RIGHT keys on the remote control transmitter.
6.
Store by pushing MENU/SELECT.
7.
Switch the set to STANDBY by pressing the 'POWER'
button on the remote control transmitter.
8.3.3
White Tone
Black Cut Off Alignment
You can adjust the values of the 'black cut off' level in the
WHITE TONE sub menu. The color temperature mode
(NORMAL, DELTA COOL, and DELTA WARM) or the color (R,
G, B) can be selected with the menu UP/DOWN/LEFT/RIGHT
keys. Change the value with the menu LEFT/RIGHT keys.
First, select the values for the NORMAL color temperature.
Then select the (offset) values for the DELTA COOL and
DELTA WARM mode. The alignment values are non-linear:
1.
Set the pattern generator to a white spot (chessboard)
pattern and connect the RF output to the antenna input of
the TV. Set the amplitude to 1 mV.
2.
Set the default settings as mentioned in the start of this
chapter.
3.
NORMAL settings
–
NORMAL RED = 32
–
NORMAL GREEN = 32
–
NORMAL BLUE =32
4.
CUT OFF (default) settings
–
BLACK LEVEL R = 7
–
BLACK LEVEL G = 7
5.
Measure (calibrated with the spectra) on the center of a
white square on the screen with a color analyzer. Adjust
the values of BLACK LEVEL R and BLACK LEVEL G to get
the correct XY coordinates for TINT=NORMAL as given in
the table below.
0V Ref.
CL 06532130_014.eps
131000
V
CUTOFF
[V
DC
]
max.
AFA
AFB
IF PLL offset
0
0
Decrease offset value
0
1
Increase offset value
1
0
Correct
1
1
Correct
Summary of Contents for EM1.1A
Page 35: ...Circuit Diagrams and PWB Layouts 35 EM1 1A AA 7 Layout LSP Top Side ...
Page 37: ...Circuit Diagrams and PWB Layouts 37 EM1 1A AA 7 Layout LSP Overview Bottom Side ...
Page 38: ...38 EM1 1A AA 7 Circuit Diagrams and PWB Layouts Layout LSP Part 1 Bottom Side ...
Page 39: ...Circuit Diagrams and PWB Layouts 39 EM1 1A AA 7 Layout LSP Part 2 Bottom Side ...
Page 40: ...40 EM1 1A AA 7 Circuit Diagrams and PWB Layouts Layout LSP Part 3 Bottom Side ...
Page 41: ...Circuit Diagrams and PWB Layouts 41 EM1 1A AA 7 Layout LSP Part 4 Bottom Side ...
Page 116: ...116 EM1 1A AA 7 Circuit Diagrams and PWB Layouts Personal Notes E_06532_013 eps 131004 ...
