Crt Panel - Grundig CUC 2030 N Service Manual

Abgleich / Alignment

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
Alignment
3.1 White Balance Feed in a grey scale black/white test pattern with burst.
Contrast (
Colour contrast (
Screen brightness (
Call up dialog line "WHITE ADJUSTMENT" via " "
(DIALOG CENTER) –> "OK" –> SERVICE –> "OK" –>
Service Code "8500".
3.2 Screen Grid TV set in AV position.
Voltage U Feed in a black raster.
G2
with TDA8375 Screen brightness: Grey raster just becoming dark.
Connect the voltmeter via 220kΩ to test points R, G and B.
Determine the point with the highest voltage level.
Voltmeter (220kΩ) or oscilloscope to test point with highest
voltage level.
3.3 Screen Grid Call up dialog line "Cut-off align" via " " (DIALOG CENTER)
Voltage U –> "OK" –> SERVICE –> "OK" –> Service Code "8500".
G2
with TDA8843 Confirm with "OK".
or TDA8844
2 - 6
Preparations
{
) to maximum.
i
) to mid-position.
v
) to mid-position.
CUC 2030 N / 2050 N / 2058 N / 2059 N / 2080 N
Alignment Process
With button or 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
control U on the picture tube panel.
G2
Or adjust the oscilloscope as shown below.
162.5V±2.5V
105-110V
With adjustment control U on the picture tube panel (or
G2
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".
±
2.5V with adjustment
Black level
GRUNDIG Service