Abgleich / Alignment
CUC 6460 / 6469
3 - 4
GRUNDIG Service
2. CRT Panel
Measuring Instruments: Oscilloscope with 10:1 test probe, colour test pattern, high resistance voltmeter
Cecks and adjustments after replacement or repair of:
CRT oder CRT panel: 2.1, 2.2
Preparations
Feed in a test pattern.
With the remote control adjust the screen brightness so
that the grey areas just become dark.
Switch the TV receiver to AV operation.
Connect a high-ohmic voltmeter (series resistance approx.
220k
Ω
) to the test points R, G, B and determine the
maximum voltage.
Call up the White Balance menu via the Service Pro-
gramme Info Center –> Special Functions –> Service –>
Code Number 8500.
Contrast adjustment with this menu serves to check the white
level between minimum and maximum contrast.
Alignment Process
With the control SG on the picture tube panel set the
maximum voltage level to approx. 172.5
±
2.5V.
With
4
3
set the VG and VB values so that the white
rectangular area in the middle of the picture becomes
achromatic. Store with "OK".
Alignment
2.1 Screen grid
voltage U
SG
2.2 White balance
Alignment
Video level
Preparations
Switch the SAT receiver to SAT reception (eg. Astra) and
set the correct video deviation (Astra 16MHz).
Oscilloscope: EURO-AV-socket, contact 19 (75
Ω
termin-
ation).
Trigger the CCVS signal to the vertical sync frequence.
3. SAT Module
(retrofitable)
Measuring Instruments: Oscilloscope with 10:1 test probe, colour test pattern, high resistance voltmeter
Cecks and adjustments after replacement or repair of the SAT Module
Alignment Process
With adjustment control R3848 at the SAT-Module set the
amplidute of the vertical blanking gap in the CCVS signal to
1Vpp.
Alignment
1.8 Picture
Geometry
Alignment Process
Via the menu, select the geometry values for the vertical
deflection, then set the values for the horizontal deflection.
With the
4
3
button change the setting so that the G-Y
vector (orange area in the centre of the picture) is just
covered (typ. 30…33).
Continue with the picture geometry adjustment via the
menu and store.
Move the bar to "Reset“. Press the "OK“ button.
With the
6
button return to the normal menu.
Preparations
Info Center –> Special functions –> Service –> Code 8500
–> Geometry.
Attention! Start always with the "V-Middle" adjustment
otherwise the other vertical deflection parameters would
defy correct geometry adjustment.
"V-Middle" adjustment with a video generator, eg. Grundig
VG 1000:
Reset:
Under the menu item "Reset“ an average data set from the
ROM IC820 is stored. After inadvertent re-adjustment
during servicing, these basic values can be re-loaded at
any time.
Schwarzwert
105-110V
Black level
172.5
±
2.5V
