Alignments
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 mains via an isolation transformer
with low internal resistance.
•
Allow the set to warm up for approximately 20 to 30
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:
never 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".
3.
Set "Active Display" to "Off"
8.2
Hardware Alignments
8.2.1
24 V_dc Alignment
Align R3026 on the AUX supply until the voltage on pin 1 (to 6)
of connector 1313 is 24 V_dc +/- 0.1 V (you can measure this
voltage easily on jumpers 9004 or 9005 nearby R3026).
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
LUMA GAIN
Fixed setting of "2".
IF AFC
Supply, via a service generator or via off-air, a NTSC TV-signal
with a signal strength of at least 1 mV and a frequency of 61.25
MHz (channel 3). Alignment procedure:
1.
During the IF AFC-parameter adjustment, one can see
OSD feedback on the screen.
2.
The OSD feedback can give 4 kinds of messages:
3.
The first item (IN/OUT) informs you whether you are in or
out of the AFC-window.
4.
The second item (HIGH/LOW) informs you whether the
AFC-frequency is too high or too low.
Table 8-1 OSD feedback of AFC alignment
1.
Adjust the IF AFC parameter until the
first
value is within
the AFC window (= IN).
2.
Next, adjust the IF AFC parameter until the
second
value
is LOW.
TUNER AGC
1.
Connect the RF output of a video pattern generator to the
antenna input.
2.
From the generator, input a NTSC TV signal with a signal
strength of approximately 2 mV and a frequency of 61.25
MHz (channel 3).
3.
Measure the DC voltage on pin 1 of the (main) Tuner. You
can adjust this voltage by adjusting the TUNER AGC item
in the SAM menu. Alignment is correct when the DC
voltage is just below 3.5 V.
BLEND INTENSITY
Use this alignment when you replace the microcontroller
(7001), NVM (7011), or the EPLD (7V01). It aligns the level of
transparency of the menu-picture blended into the main-
picture. Fixed setting of "16".
8.3.2
2FH ADC ALIGNMENT
Only necessary to align, when the EPLD (7V01) or NVM (7011)
is replaced. Use the default values as mentioned in the table.
Table 8-2 Default values "2fH ADC alignment"
AFC-window AFC-frequency vs. reference
Out
High
In
High
[ In ]
[ Low ]
Out
Low
Menu item
Alignment value
RED GAIN RGB
89
BLUE GAIN RGB
97
GREEN GAIN RGB
110
RED OFFSET RGB
59
BLUE OFFSET RGB
60
GREEN OFFSET RGB
49
RED GAIN YPBPR
89
BLUE GAIN YPBPR
97
GREEN GAIN YPBPR
90
("GREEN GAIN RGB" minus "20")
RED OFFSET YPBPR
59
BLUE OFFSET YPBPR
60
GREEN OFFSET
YPBPR
49
FTL13U_AA_AB_312278513481.book Page 133 Thursday, December 30, 2004 1:50 PM
