Specifications

Alignments
EN 67L04.6HU CA 8.
8. Alignments
Index of this chapter:
8.1 General Alignment Conditions
8.2 Hardware Alignments
8.3 Software Alignments and Settings
Notes:
• The Service Default Mode (SDM) and Service Alignment
Mode (SAM) are described in chapter 5. Menu navigation
is done with the CURSOR UP, DOWN, LEFT or RIGHT
keys of the remote control transmitter.
• Figures below can deviate slightly from the actual situation,
due to different set executions.
8.1 General Alignment Conditions
8.1.1 Start Conditions
Perform all electrical adjustments under the following
conditions:
• Power supply voltage (depends on region):
– AP-NTSC: 120 V
AC
or 230 V
AC
/ 50 Hz (± 10%).
– AP-PAL-multi: 120 - 230 V
AC
/ 50 Hz (± 10%).
– EU: 230 V
AC
/ 50 Hz (± 10%).
– LATAM-NTSC: 120 - 230 V
AC
/ 50 Hz (± 10%).
– US: 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 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.
8.2 Hardware Alignments
Figure 8-1 Top view family board
8.2.1 Vg2 Adjustment
1. Activate the SAM.
2. Go to the WHITE TONE sub menu.
3. Set the values of NORMAL RED, GREEN, and BLUE to
“32”.
4. Go, via the MENU key, to the normal user menu and set
5. SATURATION/COLOR to “0”.
6. CONTRAST to “0”.
7. BRIGHTNESS to minimum (OSD just visible).
8. Return to the SAM via the MENU key.
9. Connect the RF output of a pattern generator to the
antenna input. Test pattern is a 'black' picture (blank
screen on CRT without any OSD info) with a signal
strength of 1 V_pp.
10. Connect the 10:1 probe to the positive side of the vertical
deflection (positive flyback pulse). Ground the scope at the
CRT-panel. Trigger the scope on the vertical pulse.
11. Measure with a 100:1 probe (Ri > 10 Mohm, Ci < 3.5 pF) at
the cathodes of the picture tube socket (pin 8 - RED, pin 6
- GREEN and pin 11 - BLUE). Measure the level of the
black current measuring pulses. These are the 2nd line
(Red), 3rd line (Green), and 4th line (Blue) directly after the
frame blanking.
Remark: This chassis is using a TDA110xx (Hercules)
series. There are two different measuring pulses at each of
the R, G, and B cathodes. The above-mentioned level
applies to the lower pulse (which is the nearer one to the
ground) of the gun with highest cut-off voltage.
12. Select the cathode with the highest V_dc value for the
alignment. Adjust the V_cutoff of this gun with the
SCREEN potentiometer (see figure “Top view family
board”) on the LOT to the 160V.
13. Restore BRIGHTNESS and CONTRAST to normal (= 31).
Figure 8-2 V_cutoff waveform
8.2.2 Focusing
1. Tune the set to a circle or crosshatch test pattern (use an
external video pattern generator).
2. Choose picture mode NATURAL (or MOVIES) with the
SMART PICTURE button on the remote control
transmitter.
3. Adjust the FOCUS potentiometer (see figure “Top view
family board”) until the vertical lines at 2/3 from east and
west, at the height of the center line, are of minimum width
without visible haze. Also the vertical lines may not be too
wide compared to the central lines in the picture. Check
this for both cross-hatch and circle pattern.
1504
C
E_14480_030.eps
130204
A
D
B
LOT
Focus
Screen
VG2
5512
1005
ComPair
1000 (TUNER)
9275
SDM
7990
7601
1506
9252
1221
1204
0V Ref.
E_06532_011.eps
110204
V
CUTOFF
[V
DC
]
max.