CUC 2030 / 2030N / 2031 / 2031N
Abgleich / Alignment
2 - 3
GRUNDIG Service
GB
Alignment
All adjustment controls not mentioned in this description are pre-set at the factory and must not be re-adjusted in the case of repairs.
1. Chassis Board
Measuring instruments: Dual-channel oscilloscope, 10:1 test probe, digital voltmeter, colour video generator , spectrum analyser, RF millivoltmeter
Service works after replacement or repair of the following modules:
- Power supply: alignment 1.1
- Tuner: alignment 1.3
- NVM IC82005: alignment 1.2 …1.8, 2.1., 2.2., 3.1, 3.3
Adjust R60037 or R61313 acc. to the table (page 3-15) on
the power supply circuit diagram.
With button "
V
-" or "+
C
" set the values for "Green"
and "Blue" so that the picture becomes achromatic.
Check the White Balance with Contrast min. and max.
Terminate "with mem.".
Adjust 105dB
µ
V with button "
V
-" or "+
C
".
Alternatively, without using a spectrum analyser or RF
millivoltmeter, adjust the picture with button "
V
-" or "+
C
"
so that noise just appears on the screen. Then reset until
the picture is again free of noise.
Terminate "with mem.".
Activate the setting with "OK".
Internal adjustment of the PLL demodulator is carried out.
If an arrow is displayed beside the text after adjustment,
re-adjust the AFC with demodulator filter F33025 until the
arrows disappear. The arrow on the left or right of the AFC
value in the menu indicates the sense of rotation for
adjusting the filter.
Arrow on the right, core of the filter turned in too far.
Arrow on the left, core of the filter turned out too far.
Repeat this adjustment with "OK".
Terminate "with mem.".
Activate the setting with "OK".
Internal adjustment of the PLL demodulator is carried out.
If an arrow is displayed beside the text after adjustment,
re-adjust the AFC with demodulator filter F33025 until the
arrows disappear. The arrow on the left or right of the AFC
value in the menu indicates the sense of rotation for
adjusting the filter.
Arrow on the right, core of the filter turned in too far.
Arrow on the left, core of the filter turned out too far.
Repeat this adjustment with "OK".
Terminate "with mem.".
With button "
V
-" or "+
C
" position the menu in the
middle of the picture.
With button "
V
-" or "+
C
" enter the correct screen
diagonal.
Terminate "with mem.".
Only the 63cm or 70cm tubes are allowed to be set to "off"
with button "
V
-" or "+
C
".
Terminate "with mem.".
1.1 +A voltage
1.2 White Balance
1.3 Tuner AGC
1.4 AFC Reference
only VST Tuner
1.5 AFC Reference
only PLL-Tuner
1.6 OSD
1.7 Tube
(Type of picture
tube)
1.8 Overscan
This voltage must be checked and re-adjusted if necessary
after every repair and before every alignment.
Brightness: Minimum
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 the dialog line "WHITE ADJUSTMENT" via
"DIALOG CENTER" –> Service Code Number "8500".
Spectrum analyser or RF millivoltmeter symmetrical to
tuner contact 10, 11.
Feed in a standard test pattern or generator via the aerial,
70…80dB
µ
V.
Call up the dialog line "AGC" via "DIALOG CENTER" –>
SERVICE –> Service Code Number "8500".
Feed in a generator test pattern with vision carrier 38.9MHz,
ca. 120mV to tuner contact 10, 11.
Call up the dialog line "AFC" via "DIALOG CENTER" –>
SERVICE –> Service Code Number "8500".
Feed in a standard test pattern with standardized channel
spacing, band 1 (channel 2…4) without finetuning.
Call up the dialog line "AFC" via "DIALOG CENTER" –>
SERVICE –> Service Code Number "8500".
Call up the dialog line "OSD" via "DIALOG CENTER" –>
SERVICE –> Service Code Number "8500".
Call up the dialog line "Tube" via "DIALOG CENTER" –>
SERVICE –> Service Code Number "8500".
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" –>
SERVICE –> Service Code Number "8500".
Alignment
Preparations
Alignment Process
