Alignment - Grundig CUC 7305 Service Manual

Abgleich / Alignment

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: 100MHz oscilloscope with 10:1 test probe, RF millivoltmeter, colour test pattern, high resistance voltmeter
Checks and adjustments after replacement or repair of:
Power Supply: Alignment 1
Picture Tube: Alignment 4, 5, 6, 7
IF: Alignment 2, 3
Alignment
1. +A Voltage Luminance: Mimimum
Voltmeter: Cathode D682
+A Spannung
Voltmeter: Cathode D60061
(12V Power Supply 007 3100)
Voltmeter: Cathode D60461
(12V Power Supply 007 3300)
2. Tuner AGC 100MHz oscilloscope or RF millivoltmeter to tuner
contact 10 or 11 and tuner ground.
Feed in a colour video generator (sound carrier switched
off) via the aerial, 70...80dBµV.
Switch the TV off with the power button.
Call up the Service Menu with remote control.
(press and hold the button " " and switch the TV on).
With
3. Vision demodulator Feed in a generator with vision carrier 38.9MHz ca. 120mV
on tuner contact 10, 11.
(vision carrier
38.9MHz) Norm 1 via Menü (" " –> "OK")
Voltmeter: IC850-(34)
Vision demodulator Feed in a generator with vision carrier 33.4MHz ca. 120mV
French standard on tuner contact 10, 11.
Norm 3 via Menü (" " –> "OK")
(vision carrier
33.4MHz) Voltmeter: IC850-(34)
4. White balance Feed in a FuBK test pattern.
Set the colour contrast (
Set the contrast to maximum.
Adjust the screen brightness (
the darkest grey scale value to black is just still visible.
5. Screen grid Feed in a grey scale test pattern.
voltage U Adjust the screen brightness so that the gradation from the
G2
darkest grey scale value to black is just still visible
(2.7V to IC150-(17)).
Set the contrast to minimum.
Connect an oscilloscope to test points R, G, B (on the CRT
panel) to determine the one with the highest black level.
6. Line sharpness Select the convergence test pattern.
Contrast to maximum.
Set the brightness so that the black background of the test
pattern is just brightening.
7. Picture geometry Allow the TV to warm up (ca. 15 min.) before setting the
geometry.
Line width Inject convergence test pattern.
(optional) Low contrast.
Horizontal picture Inject convergence test pattern.
position (optional)
Picture amplitude Inject convergence test pattern.
Vertical picture Inject convergence test pattern.
linearity (optional)
Vertical picture Inject convergence test pattern.
position (optional)
3 - 2
Horizontal Deflection: Alignment 5, 6, 7
IC150: Alignment 2, 3, 7
IC830 (NVM): Alignment 2
Preparations
or buttons select the menu item "AGC ALIGN".
i
) to minimum.
v
) so that the gradation from
Alignment Process
With control R654 set the voltage to 114V (14" Orion),
105V (14" Philips).
With control R60014 set the voltage to 105V (14" Philips)
With control R60414 set the voltage to 124V (20" SAM).
Adjust 300mV with button or
pp
Alternatively, without using a oscilloscope or RF
millivoltmeter, adjust the picture with button
that noise just appears on the screen. Then reset until the
picture is again free of noise.
Terminate with " ".
With filter F130 set the DC level to 2.5V.
With trimmer C136 set the DC level to 2.5V.
Repeat mutual adjustments!
Set the controls VG (R751) and VB (R771) on the CRT
panel so that no discolouration is visible in the grey scale.
With the control U (Splitt Transformer) adjust the black level at
G2
the test point with the highest black level to approx. 110V...115V
for 14" picture tubes and 145V...155V for 15...21" picture tubes.
Black level
110V...115V 14"
145V...155V 15"...21"
With the focus control U on the picture tube panel adjust
F
the vertical lines about 5cm from the right and left picture
edge for minimum horizontal width.
The sharpness in the middle must not seem to be worse than
the sharpness at the edges. If necessary, take an average.
Use L533 to adjust the line width according to the test
pattern.
Use R166 to adjust the picture to its horizontal centre
position.
Use R411 to adjust the picture amplitude according to the
test pattern.
Use R408 to adjust the test pattern to uniform picture
linearity.
Use R413 to adjust the picture to its vertical centre position.
CUC 7305
.
or so
GRUNDIG Service