Picture Geometry; Crt Panel - Grundig CUC 2020N Service Anleitung

Abgleich / Alignment

2. Picture Geometry

Measuring instruments: Test pattern generator.
Allow the TV set to warm up (about 15 min.). Adjust the geometry beginning with the vertical slope!
On completion of this adjustment, store the values "with mem." via "DIALOG CENTER"–>"SERVICE"–> Service Code "8500"–>"GEOMETRY".
Service works after replacement or repair:
- Horizontal and vertical deflection and replacement of the picture tube, NVM IC82005: alignment 2.1, 2.2
Alignment
2.1 Vertical Slope Feed in a geometry test pattern.
Call up the"Vertical Slope" menu via " " (DIALOG CENTER)
–>"OK" –> SERVICE –> "OK" –> Service Code "8500"
–> "GEOMETRY".
2.2 Horizontal Shift Feed in a geometry test pattern.
Call up
" " (DIALOG CENTER) –> "OK" –> SERVICE –> "OK" –>
Service Code "8500" –> "GEOMETRY".

3. CRT Panel

Measuring instruments: High-resistance voltmeter or dual-channel oscilloscope with 10:1 test probe, colour generator.
Service works after replacement or repair:
- CRT, CRT panel, NVM IC82005: alignment 3.1
Alignment
3.1 Screen Grid TV set in AV position.
Voltage U Feed in a black raster.
G2
with measuring Screen brightness: Grey raster just becoming dark.
instrument Connect the voltmeter via 220kΩ to test points R, G and B.
Determine the point with the highest voltage level.
Voltmeter (220kΩ) or oscilloscope: test point with highest
voltage level.
via Call up dialog line "Cut-off align" via " " (DIALOG CENTER)
Service Menu –>"OK" –> SERVICE –> "OK" –> Service Code "8500".
Confirm with "OK".
2 - 4
Preparations
dialog line "Horizontal
Preparations
Adjust the center line of the test pattern in the dialog line
"Vertical Slope" with button "
still visible.
Correct this adjustment slightly if linearity faults appear on
the lower or upper picture edge after having adjusted the
geometry.
Set the picture according to the test pattern with button
Shift" via " -" or "+ ".
With adjustment control U
the voltmeter to read 150V
as shown below.
With adjustment control U
adjust the line appearing first - red, green, blue or mixed-
colour - so that it is just well visible.
Return to the menu with "OK".
CUC 2020 / 2020N
Alignment Process
-" or "+ " so that it is just
Alignment Process
on the picture tube panel set
G2
±
2.5V, or adjust the oscilloscope
Black level
150V±2.5V
105-110V
on the picture tube panel,
G2
GRUNDIG Service