Alignements / Alignment
CUC 7303 FR
3 - 2
GRUNDIG Service
Alignment Process
With control
R654 set the voltage to
112V (14" Orion), 105V (14" Philips), 124V (15…21").
With the control
U
G2
adjust the black level at the test point
with the highest black level to approx.
100V…105V for 14"
picture tubes and
150V…155V for 15…21" picture tubes.
Schwarzwert
105-110V
With the focus control
U
F
on the focusing panel adjust the
horizontal lines for maximum sharpness.
With filter
F130
set the DC level to
2.5V.
With trimmer
C136 set the DC level to 2.5V.
Repeat mutual adjustments!
With the
"
V
- or +
C
"
buttons tune the station so that
noise just starts to appear in the picture. Then reduce the
value so that the noise just disappears from the picture.
Terminate with "
6
".
Set the controls
VG and VB on the CRT panel so that no
discolouration is visible in the grey scale.
Alignment
All adjustment controls not mentioned in this description are adjusted during production and must not be re-adjusted in the case of repairs.
Measuring Instruments: Oscilloscope with 10:1 test probe, colour test pattern, high resistance voltmeter
Checks and adjustments after replacement or repair of:
Power Supply: 1.
Horizontal Deflection: 2., 3.
Picture Tube, CRT-Panel: 2., 6.
IC150: 4., 5.
Tuner: 4., 5.
Alignment
1. +A Voltage
2. Screen grid
voltage U
G2
3. Line sharpness
4. Vision
demodulator
(vision carrier 38.9 MHz)
Vision demodulator
French standard
(vision carrier 33.4MHz)
5. Tuner AGC
6. White balance
Preparations
Set luminance to mimimum.
Connect the voltmeter to the cathode of D682.
Feed in a grey scale test pattern.
Adjust the screen brightness so that the gradation from the
darkest grey scale value to black is just still visible
(2.7V to IC150-(17).
Set the contrast (
W
) to mid-value.
Measure test points R, G, B (on the CRT panel) to
determine the test point with the highest black level and
connect this point to the oscilloscope.
Select the convergence test pattern.
Contrast (
W
) to maximum.
Set the brightness so that the black background of the test
pattern is just brightening.
Feed in a generator with vision carrier 38.9MHz ca. 120mV
on tuner contact 10, 11.
Vision carrier 38.9 MHz.
Norm 1 via Menü ("
6
" –> "OK")
Voltmeter: IC850-(34)
Feed in a generator with vision carrier 33.4MHz ca. 120mV
on tuner contact 10, 11.
Norm 3 via Menü ("
6
" –> "OK")
Voltmeter: IC850-(34)
Feed in a standard test pattern at a channel in the upper
range of the UHF band and store it at programme position 1.
RF = 1.5mV (64dB
µ
V, noise-free picture).
Switch the TV off with the power button.
Call up the Service Menu with remote control.
(press and hold the button "
6
" and switching the TV on).
With "P+/P-" buttons select the menu item "AGC ALIGN".
Feed in a FuBK test pattern.
Set the colour contrast (
E
) to minimum.
Set the contrast (
W
) to maximum.
Adjust the screen brightness (
R
) so that the gradation
from the darkest grey scale value to black is just still
visible.
100V…105V 14"
150V…155V 15…21"
Black level
GB
