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Abgleich / Alignment
Alignment
1.11 Picture
geometry
1.12 Adjustment of
the bridge coil
L53074
1.13
Line
sharpness
1.14.1 Noise reduc-
tion on per-
programme
basis
1.14.2 all pro-
grammes
1...99
2. Picture Tube Panel
Measuring instruments: High-resistance voltmeter
Service works after replacement or repair of:
- picture tube, picture tube panel: Alignment no. 2.1 and 2.2
Alignment
2.1. White balance
see 1.6
2.2. Screen grid
voltage U
G2
2 - 6
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Preparations
With button " " call up "Geometry" via "Dialog Center" –> "Service"
–> "for authorised dealer "–> "Code Number 8500 "–> (menu
guide).
Feed in a test generator pattern or a standard test pattern into the
aerial socket.
Attention: The "Line shift" alignment influences the line phase.
Before this adjustment, set the horizontal amplitude to minimum
and if necessary correct the raster position with the "H-Shift" plug.
Reset:
The "Reset" menu contains:
- either the optimum picture geometry data entered in the
factory
- or the average data set read out from the ROM if the TV
has been switched on with the emergency data set.
On misalignment, these basic values can be re-loaded at
any time as follows:
With button " " call up the "Reset" menu via "Dialog Center
"–> "Service" –> "for authorised dealer" –> "Code Number
8500" –> (menu guide) and confirm with "OK".
The bridge coil L53074 is adjusted at the factory and
should not be readjusted any more.
With button " " call up the "Geometry" menu via "Dialog
Center" –> "Service" –> "for authorised dealer" –> "Code
Number 8500" –> (menu guide)
- Set the horizontal amplitude (width) to minimum.
- Oscilloscope channel 1: collector T53001.
- Oscilloscope channel 2: cathode D53072.
- Select the convergence test pattern:
{
- Contrast (
) to maximum.
v
- Set the brightness (
) so that the black background of
the test pattern is just brightening.
Call up the "Noise reduct." menu with the red key via
"Picture settings" –> "OK Personal" –> (menu guide).
With button " " call up the "Noise reduct." menu via "Dialog
Center" –> "Service" –> (menu guide).
Preparations
- Feed in a grey scale black/white test pattern with burst.
- Set white balance to mid-position.
{
- Contrast (
) to maximum.
i
- Colour contrast (
) to mid-position.
v
- Screen brightness (
) to mid-position.
- Switch off "Perfect Clear" (red key –> Picture settings
–> OK Personal).
With " " call up "White bal." via "Dialog Center" –> "Service" –>
"for authorised dealer" –> "Code Number 8500" –> (menu guide).
- Switch off "Perfect Clear" (red key –> Picture settings
–> OK Personal).
- Switch the TV receiver to AV mode.
- Feed in a black raster.
- Adjust the screen brightness so that the grey area just
becomes dark.
- Connect the high-resistance voltmeter with ca. 220 kΩ serial
resistance to R, G, B test point with the highest voltage level.
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Alignment Process
Via the menu guide, select the geometry values for the
vertical deflection first, then set the values for the horizontal
deflection.
With
or
button, move the picture into the centre of the
raster. Re-adjust the horizontal amplitude according to the
test pattern.
Store:
Call up "End without memory" and change to "End with
memory" with the
or
button .
Store the setting with the "OK" button.
Whenever the TV is switched on the picture geometry is set
to the value stored last.
Check the pulse width of the oscillograms and correct it if
necessary with coil L53074 so that it is the same for both
oscillograms.
With the focus control
on the picture tube panel adjust
the horizontal lines for maximum sharpness.
With the
buttons the noise reduction ("Off", "Auto",
"High!") can be changed for each programme. The setting
is stored when terminating the menu.
With the
buttons the noise reduction can be switched
on or off simultaneously for all programmes 1...99.
Alignment Process
With the
buttons set the values for VG and VB so that
the white area becomes achromatic.
Use the "?" key to call up the default values stored in
EPROM IC80060.
The setting is stored when terminating the menu.
With U
(right control of the regulating section) on the
G2
picture tube panel set the voltage to 162.5V
CUC 1825 / 1826
±
2.5V.
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