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Abgleich / Alignment
Alignment
1.11 Picture
Feed in the geometry test pattern or switch on the internal
geometry
test pattern.
Call up the menu "Geometry" with button " " via "DIALOG-
CENTER" –> "OK" –> "SERVICE" –> "OK" –> "Only for the
retailer" –> "OK" –> Code Number "8500"(menu guide).
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 "Geometry" menu via "DIALOG-
CENTER" –> "OK" –> "SERVICE" –> "OK" –> "Only for the
retailer" –> "OK" –> Code Number "8500"(menu guide).
1.11.1 Picture
Switch the TV to "A 5" programme position and feed in a
geometry
geometry pattern via PC.
VGA
With the " " button call up the "Geometry" menu via "DIALOG-
CENTER" –> "OK" –> "SERVICE" –> "OK" –> "Only for the
retailer" –> "OK" –> Code Number "8500"(menu guide).
1.12 Bridge coil
The bridge coil L53074 is adjusted in the factory and should
L53074
not be readjusted any more.
(Mains
With button " " call up the "Geometry" menu via "DIALOG-
Chassis)
CENTER" –> "OK" –> "SERVICE" –> "OK" –> "Only for the
retailer" –> "OK" –> Code Number "8500"(menu guide).
Set the horizontal amplitude (width) to minimum.
Oscilloscope channel 1: collector T53001.
Oscilloscope channel 2: cathode D53072.
1.13 Line
- Select the convergence test pattern:
sharpness
- Contrast ( ) to maximum.
- Set the brightness ( ) so that the black background of
the test pattern is just brightening.
2. Picture Tube Board
Measuring instruments: High-resistance voltmeter, Dual -channel oscilloscope with test probe 10:1.
Service works after replacement or repair of:
- picture tube, picture tube board: Alignment no. 2.1 and 2.2
Alignment
2.1. White balance
Feed in a grey scale black/white test pattern with burst.
see 1.6
Set white balance to mid-position.
Contrast ( ) to maximum.
Colour contrast ( ) to mid-position.
Screen brightness ( ) to mid-position.
Switch off "Perfect Clear"
("red key" –> "PICTURE SETTINGS" –> "OK" Personal values).
With button " " call up the "White balance" menu via
"DIALOGCENTER" –> "OK" –> "SERVICE" –> "OK" –>
"Only for the retailer" –> "OK" –> Code Number
"8500"(menu guide).
Switch off "Perfect Clear"
2.2. Screen grid
("red key" –> "PICTURE SETTINGS" –> "OK" Personal values).
voltage U
, U
G2,
SG
TV receiver to AV mode.
Feed in a black raster.
The control unit of
Screen brightness: grey aera just becomes dark.
the Philips picture
tube is fitted on the
Voltmeter via 220 kΩ to R, G, and B test point.
chassis.
Determine highest voltage level.
2 - 8
Preparations
Preparations
Alignment Process
Check the geometry via the menu guide and correct the
setting if necessary.
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 "OK".
Whenever the TV is switched on the picture geometry is set
to the value stored last.
Check the geometry via the menu guide and correct the
setting if necessary.
A separate geometry data set for programme position A5 is
stored in IC87030 .
Check the pulse width of the oscillograms and correct it if
necessary with coil L53074 so that it is the same for both
oscillograms.
Re-adjust the horizontal amplitude according to the test
pattern.
With the focus control
on the cascade adjust the
horizontal lines for maximum sharpness.
Subsequently, adjust the vertical lines for maximum
sharpness using the dynamic focus control
focusing board). Repeat alternately.
Alignment Process
With the
buttons set the values for VG and VB so that
the picture becomes achromatic.
Store with "OK".
The "?" key, default values, is used to call up the last stored
white value.
With the control U
or U
on the picture tube panel set the
G2
SG
test point with the highest voltage level to approx.
±
162.5V
2.5V.
Black level
160V...165V
105-110V
Digi 6
(dynamic
GRUNDIG Service
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