Philips L04HU Service Manual page 64

EN 64 8. L04HU AA
8.3.2
Deflection
The Deflection Sub menu contains the following items:
•
AKB ON to enable, OFF to disable the 'black current loop'
(AKB = Auto Kine Bias).
•
Brightness (set Brightness)
•
Contrast (set Contrast)
"See VG2 alignment"
8.3.3
Tuner
The Tuner Sub menu contains the following items:
Note: Described alignments are only necessary when the NVM
(item 7602) is replaced.
IF PLL
Phase Locked Loop Used for FST tuning systems.
Adjust the IFPLL value (default value is 30) with the LEFT/
RIGHT cursor keys.
AGC (AGC take over point)
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).
Connect a DC multimeter to pin 1 of the tuner (item 1000 on
the main panel).
1. Activate the SDAM.
2. Go to the TUNER sub menu.
3. Select AGC with the UP/DOWN cursor keys.
4. Adjust the AGC-value (default value is 28) with the LEFT/
RIGHT cursor keys until the voltage at pin 1 of the tuner lies
between 3.8 and 2.3 V.
5. Switch the set to STANDBY.
SL (Slicing level)
Slicing level for vertical sync
This adjustment is always set to 0 (for NTSC system only).
CFA0
Comb Filter forced mode.
This adjustment is always set to OFF.
CL (cathode drive level)
Adjust the CL value (default value is 4) with the LEFT/RIGHT
cursor keys.
YD
Y-delay adjustment.
This is a fixed value, always set to 7.
8.3.4
White Tone
In the WHITE TONE sub menu, the values of the black cut off
level can be adjusted. Normally, no alignment is needed for the
WHITE TONE. You can use the given default values.
The colour temperature mode (NORMAL, COOL and WARM)
and the colour (RED, GREEN, and BLUE) can be selected with
the UP/DOWN RIGHT/LEFT cursor keys. The value can be
changed with the LEFT/RIGHT cursor keys. First, select the
values for the NORMAL colour temperature. Then select the
values for the DELTA COOL and DELTA WARM mode. After
alignment, switch the set to standby, in order to store the
alignments.
8.3.5
Geometry
The geometry alignments menu contains several items to align
the set, in order to obtain correct picture geometry.
Alignments
1
2
3
4
5
6
7
8
9
10
11
12
Geometry
Figure 8-3
Connect an external video pattern generator to the aerial input
of the TV-set and input a crosshatch test pattern. Set the
generator amplitude to at least 1 mV and set frequency to 61.25
MHz (NTSC).
1. Activate the SDAM menu (see chapter 5).
2. Go to the GEOMETRY sub menu.
Now you can perform the following alignments:
•
Horizontal Parallelogram (HP) Align straight vertical lines
in the top and the bottom; vertical rotation around the
centre.
•
Horizontal Bow (HB) Align straight horizontal lines in the
top and the bottom; horizontal rotation around the centre.
•
Horizontal Shift (HS) Align the horizontal centre of the
picture to the horizontal centre of the CRT.
•
Vertical slope (VS) Align the vertical centre of the picture
to the vertical centre of the CRT. This is the first of the
vertical alignments to perform. For an easy alignment, set
SBL to ON.
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
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