Grundig ST 63-705 NIC/TEXT Service Manual page 11

CUC 2030 N ... CUC 2080 N
Alignment
1.7 Overscan Only with IC TDA8843 or TDA8844 as well as with Philips
72cm/84cm in 4:3 and 70cm/82cm in 16:9 format picture
tubes.
Call up the dialog line "Overscan" via " " (DIALOG
CENTER) –> "OK" –> SERVICE –> "OK" –> Service Code
"8500".
1.8 NTSC 3.6 Call up the dialog line "NTSC 3,6" via " " (DIALOG
CENTER) –> "OK" –> SERVICE –> "OK" –> Service
Code "8500".
1.9 Line Sharpness - Feed in a convergency test pattern.
- Set the16:9 picture format (with 16:9 TV sets).
only TV's - Contrast ( ) to maximum.
with - Set the screen brightness ( ) so that the black
Focus Block background of the test pattern just starts to brighten.
Line Sharpness - Feed in a convergency test pattern.
- Set the16:9 picture format (with 16:9 TV sets).
only TV's - Contrast ( ) to maximum.
without - Set the screen brightness ( ) so that the black
Focus Block background of the test pattern just starts to brighten.
2. Picture Geometry
Measuring instruments: Colour video generator, dual-channel oscilloscope with 10:1 test probe.
Service works after replacement or repair:
Start with the vertical slope when adjusting the geometry!
- Horizontal and vertical deflection and replacement of the picture tube: alignment 2.1, 2.2
- Bridge coil L53074: Only necessary after unskillful manipulation of the horizontal deflection: alignment 2.3
NVM IC82005: alignment 1.2 ...1.8, 2.1, 2.2, 3.1, 3.3
Alignment
2.1 Vertical Slope Call up the "Vertical Slope" menu via " " (DIALOG CENTER)
–> "OK" –> SERVICE –> "OK" –> Service Code "8500" –
> "GEOMETRY"
2.2 Horizontal Shift Max. brightness.
Call up dialog line "Horizontal Width" via " " (DIALOG
CENTER) –> "OK" –> SERVICE –> "OK" –> Service Code
"8500" –> "GEOMETRY" –> "OK" and reduce the width of
the picture using button "
Call up dialog line "Horizontal Shift".
2.3 Bridge Coil Bridge coil L53074 is adjusted in the factory and this
L53074 setting must not be changed.
Call up dialog line "Horizontal Width" via " " (DIALOG
CENTER) –> "OK" –> SERVICE –> "OK" –> Service Code
"8500" –> "GEOMETRY" –> "OK".
Set Horizontal Width to minimum.
Oscilloscope channel 1: collector T53001.
Oscilloscope channel 2: cathode D53072.
GRUNDIG Service
Preparations
Preparations
-" or "+ ".
Alignment Process
Set to "off" with button " -" or "+
Dialog line "End", terminate "with mem.".
Set to "off" or "on" with button "
on the type of television receiver.
Dialog line "End", terminate "with mem.".
With focus control Focus 1 adjust the horizontal lines in the
middle of the screen to minimum vertical width.
Subsequently, with focus control Focus 2, adjust the vertical
lines approx. 5cm from the right and left picture edge to
minimum horizontal width.
0
With focus control , adjust the vertical lines approx. 5cm
from the right and left picture edge to minimum horizontal
width.
The sharpness in the middle must not seem to be worse
than the sharpness at the edges. If necessary, take an
average.
Alignment Process
Adjust the center line of the test pattern in the dialog line
"Vertical Slope" (typ. 30...33) with button "
so that it is just still visible.
Press button " " twice (GEOMETRY –> SERVICE) and
terminate the dialog line "End" with "with mem.".
The picture geometry is adjusted to the value last stored
whenever the TV set is switched on.
Position the picture content in the middle of the raster using
button " -" or "+ ".
Re-adjust the horizontal width according to the test pattern.
With connector "ST-Shift" on the chassis (option), position
the test pattern in the middle of the screen.
Dependent on the scanning spread of the picture tube this
connector may be retrofitted, connected the other way
round, or the rating of the resistor may be changed.
Press button " " twice (GEOMETRY –> SERVICE) and
terminate the dialog line "End" with "with mem.".
The picture geometry is adjusted to the value last stored
whenever the TV set is switched on.
Check the oscillograms for the same pulse width and re-
adjust it if necessary with coil L53074.
Adjust the horizontal width according to the test pattern.
Abgleich / Alignment
".
-" or "+ " dependent
-" or "+ "
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