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8. Alignments
Index of this chapter:
8.1 General Alignment Conditions
8.2 Hardware Alignments
8.3 Software Alignments
8.4 Option Settings
8.1
General Alignment Conditions
8.1.1
Start Conditions
Perform all electrical adjustments under the following
conditions:
•
Power supply voltage: US: 120 V
•
Connect the set to the AC Power via an isolation
transformer with low internal resistance.
•
Allow the set to warm up for approximately 15 minutes.
•
Measure voltages and waveforms in relation to chassis
ground (with the exception of the voltages on the primary
side of the power supply).
Caution: It is not allowed to use heatsinks as ground.
•
Test probe: Ri > 10 Mohm, Ci < 20 pF.
•
Use an isolated trimmer/screwdriver to perform
alignments.
8.1.2
Initial Settings
Perform all electrical adjustments with the following initial
settings (via the "Active Control" button on the RC):
1. To avoid the working of the light sensor, set ACTIVE
CONTROL to "OFF".
2. Set SMART PICTURE to "NATURAL/ECO".
8.1.3
Alignment Sequence
•
First, set the correct options:
–
In SAM, select (SERVICE) OPTIONS -> OPT. NO,
–
Fill in the option settings according to the set sticker
(see also paragraph "Option Settings"),
–
Select STORE OPTIONS and push OK on the remote
control,
–
After storing, the set must be restarted!
•
Warming up (>10 minutes).
•
White point alignment.
8.2
Hardware Alignments
There are no hardware alignments foreseen for this chassis.
For info on any PDP alignments, please refer to the appropriate
PDP repair manual.
8.3
Software Alignments
Put the set in SAM mode (see the "Service Modes, Error Codes
and Fault Finding" section). The SAM menu will now appear on
the screen. Select ALIGNMENTS and go to one of the sub
menus. The alignments are explained below.
Notes:
•
All changes must be stored manually.
•
If an empty EAROM (permanent memory) is detected, all
settings are set to pre-programmed default values.
8.3.1
General
For the next alignments, supply the following test signals via a
video generator to the RF input:
•
EU/AP-PAL models: a PAL B/G TV-signal with a signal
strength of at least 1 mV and a frequency of 475.25 MHz
/ 60 Hz (± 10%).
AC
Alignments
EJ3.0U PA
•
US/AP-NTSC models: an NTSC M/N TV-signal with a
signal strength of at least 1 mV and a frequency of 61.25
MHz (channel 3).
•
LATAM models: an NTSC M TV-signal with a signal
strength of at least 1 mV and a frequency of 61.25 MHz
(channel 3).
Tuner AGC
Purpose: To keep the tuner output signal constant as the input
signal amplitude varies.
For this chassis, no alignment is necessary, as the AGC
alignment is done automatically (standard value: "32").
IF PLL offset pos. (and neg.)
The IF PLL Offset value needs to be realigned in case the MPIF
and/or the NVM have been replaced. This is not necessary in
case only the tuner has been replaced. Default values are:
•
For Europe PAL: 40
•
For Europe SECAM: 32
•
For USA NTSC: 32
In case the result is not satisfying (distortion in sound and/or
discoloration in left and right part of the picture), use the
following method to align the IF PLL Offset value:
•
Switch set "off".
•
Disconnect speakers and connect a resistor of 1 kΩ
instead.
•
Connect AC voltmeter at resistor.
•
Switch set "on".
•
Put "Volume" at maximum.
•
Align PLL until voltage is at minimum.
In case the minimum value on the AC voltmeter is found in a
range of IF PLL Offset values, the value should be taken that is
in the middle of this range.
8.3.2
White Point
•
Set ACTIVE CONTROL to OFF.
•
In the [MENU] -> PICTURE user menu, set:
–
DYNAMIC CONTRAST to OFF.
–
COLOR ENHANCEMENT to OFF.
–
COLOR to "0".
–
CONTRAST to "100".
–
BRIGHTNESS to "50".
•
Go to the SAM and select ALIGNMENTS -> WHITE
POINT.
Method 1 (with color analyzer):
•
Use a 100% white screen as input signal and set the
following values:
–
COLOR TEMPERATURE: Tint to be aligned.
–
All WHITE POINT values to: "127".
–
RED BL OFFSET value to: "7".
–
GREEN BL OFFSET value to: "4".
•
Measure with a calibrated (phosphor- independent) color
analyzer in the centre of the screen. Consequently, the
measurement needs to be done in a dark environment.
•
Adjust, by means of decreasing the value of one or two
white points, the correct x,y coordinates (see table "White
D alignment values"). Tolerance: dx,dy: ± 0.004.
•
Repeat this step for the other Color Temperatures that
need to be aligned.
•
When finished press STORE (in the SAM root menu) to
store the aligned values to the NVM.
•
Restore the initial picture settings after the alignments.
8.
EN 95
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