Alignement / Alignment
CUC 2080 F
GRUNDIG Service
10
3.1 White Balance
3.2 Screen Grid
Voltage U
G2
with
TDA8375
3.3 Screen Grid
Voltage U
G2
with
TDA8843-N2
or
TDA8844-N2
Feed in a grey scale black/white test pattern with burst.
Contrast (
W
) to maximum.
Colour contrast (
E
) to mid-position.
Screen brightness (
R
) to mid-position.
Call up dialog line "WHITE ADJUSTMENT" via "
6
"
(DIALOG CENTER) –> "OK" –> SERVICE –> "OK" –>
Service Code "8500".
TV set in AV position.
Feed in a black raster.
Screen brightness: Grey raster just becoming dark.
Connect the voltmeter via 220k
Ω
to test points R, G and B.
Determine the point with the highest voltage level.
Voltmeter (220k
Ω
) or oscilloscope to test point with highest
voltage level.
Call up dialog line "Cut-off align" via "
6
" (DIALOG CENTER)
–> "OK" –> SERVICE –> "OK" –> Service Code "8500".
Confirm with "OK".
3. CRT Panel
Measuring instruments: High-resistance voltmeter, dual-channel oscilloscope with 10:1 test probe.
Service works after replacement or repair:
- CRT, CRT panel: alignment 3.1…3.3
- NVM IC82005: alignment 1.2 …1.8, 2.1, 2.2, 3.1, 3.3
With button "
V
-" or "+
C
" set the values for "Green" or
"Blue" so that the picture becomes achromatic.
Check the white balance at minimum contrast and maximum
contrast.
Terminate the dialog line "End" with "with mem.".
Set the voltmeter to read 162.5V
±
2.5V with adjustment
control U
G2
on the picture tube panel.
Or adjust the oscilloscope as shown below.
Black level
105-110V
162.5V
±
2.5V
With adjustment control U
G2
on the picture tube panel (or
Focus Block), adjust the line appearing first - red, green,
blue or mixed-colour - so that it is just well visible.
Return to the menu with "OK".
Alignment
Preparations
Alignment Process
