Alignments
EN 99
EJ2.0U LA
8.
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: 120 V
AC
/ 60 Hz (
±
10%).
•
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 the correct
ground (e.g. measure audio signals in relation to
AUDIO_GND).
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 lightsensor, set ACTIVE
CONTROL to OFF.
2.
Set LIGHT SENSOR to OFF.
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"),
–
Press OK on the remote control
before
the cursor is
moved to the left
–
Select STORE OPTIONS and push OK on the remote
control,
–
In main menu, select STORE again and press OK on
the RC,
–
After storing, the set must be restarted!
•
Warming up (>10 minutes).
•
White point alignment.
8.2
Hardware Alignments
Not applicable.
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 NVM (permanent memory) is detected, all
settings are set to pre-programmed default values.
To store the data:
•
Press OK on the RC
before
the cursor is moved to the left.
•
In main menu select “Store” and press OK on the RC.
•
Press MENU on the RC to switch back to the main menu.
•
Switch the set to STAND-BY mode.
8.3.1
General
For the next alignments, supply the following test signals via a
video generator to the RF input: NTSC M/N 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”).
8.3.2
White Point
•
Set ACTIVE CONTROL to OFF.
•
In the [MENU] -> PICTURE user menu, set:
–
DYNAMIC CONTRAST to OFF.
–
COLOUR ENHANCEMENT to OFF.
–
COLOUR 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: "5".
•
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.
Table 8-1 White D alignment values
Color Temp.
(degr. K)
Cool
(11000)
Normal
(9100)
Warm
(6500)
x
0.276
0.285
0.313
y
0.282
0.293
0.329
