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CUC 2030 F / 2031 F
Alignment
GB
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
Alignment
This voltage must be checked and re-adjusted if necessary
1.1 +A voltage
after every repair and before every alignment.
Brightness: Minimum
1.2 White Balance
Feed in a grey scale black/white test pattern with burst.
Contrast ( ) to maximum.
Colour contrast ( ) to mid-position.
Screen brightness ( ) to mid-position.
Call up the dialog line "WHITE ADJUSTMENT" via
"DIALOG CENTER" –> Service Code Number "8500".
1.3 Tuner AGC
Feed in a standard test pattern to the aerial socket.
HF ≥85dBµV
Connect the oscilloscope to contact 10 or 11 of the tuner.
Call up the dialog line "AGC" via "DIALOG CENTER" –>
SERVICE –> Service Code Number "8500".
1.4 AFC Reference
1.4.1 PLL Demodu-
Feed in a test pattern with standardized channel spacing,
lator circuit for
band 3 with the respective standard.
38.9MHz
vision carrier
Call up the dialog line "AFC" via DIALOG CENTER –>
SERVICE –> Service Code Number "8500".
1.4.2 PLL Demodu-
Feed in a test pattern with standardized channel spacing,
lator circuit for
band 1 in French TV standard.
33.4MHz
vision carrier
Call up the dialog line "AFC" via DIALOG CENTER –>
SERVICE –> Service Code Number "8500".
1.5 OSD
Call up the dialog line "OSD" via "DIALOG CENTER" –>
SERVICE –> Service Code Number "8500".
Call up the dialog line "Tube" via "DIALOG CENTER" –>
1.6 Tube
(Type of picture
SERVICE –> Service Code Number "8500".
tube)
1.7 Overscan
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".
GRUNDIG Service
Preparations
Alignment Process
With control R61313 set the voltage to 142V (25...29").
See table on page 3-15.
With button "
-" or "+
" 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 300
with button "
-" or "+
pp
Alternatively, without using a spectrum analyser or RF
millivoltmeter, adjust the picture with button "
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 "AFC" after
adjustment, re-adjust the 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.
If an arrow is displayed beside "AFC" after adjustment,
press the "OK" button to start the internal adjustment of
the demodulator circuit.
Repeat this adjustment with "OK".
Terminate "with mem".
With button "
-" or "+
" position the menu in the
middle of the picture.
With button "
-" or "+
" enter the correct screen
diagonal.
Terminate "with mem".
Only the 63cm or 70cm tubes are allowed to be set to "off"
with button "
-" or "+
".
Terminate "with mem".
Alignement / Alignment
".
-" or "+
"
2 - 3
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