CUC 6460 / 6469
Abgleich / Alignment
GRUNDIG Service
3 - 3
GB
Alignment
All adjustment controls not mentioned in this description are adjusted during production and must not be re-adjusted in the case of repairs.
1. Chassis Board
Measuring Instruments: Two-channel oscilloscope with 10:1 test probe, colour test pattern, high resistance voltmeter
Cecks and adjustments after replacement or repair of:
Power Supply: 1.1
Horizontal Deflection: 1.3, 1.8, 2.1
Colour-Decoder Sync. Module: 1.6
IF Amplifier, Tuner: 1.4
Tuning Module: 1.5, 1.7, 1.8
Vertical deflection: 1.8
Bridge Coil: only necessary after improper changes in the horizontal deflection adjustment 1.2
Alignment
1.1 +A Voltage
1.2 Bridge Coil L511
1.3 Line sharpness
1.4 Tuner-AGC
AFC-Reference
1.5 Colour match
1.6 White balance
1.7 Picture
sharpness
Preparations
Set luminance to mimimum.
Connect the voltmeter to the cathode of D671.
The bridge coil L511 is correctly adjusted during production
and should not be re-adjusted any more.
Call up the Service Programme –> "Info Center" –>
"Special Functions" –> "Service" –> "Code Number 8500"
–> "Geometry".
Set the horizontal amplitude to minimum.
Oscilloscope: channel 1 to the collector T568 .
Oscilloscope: channel 2 to katode D502.
Select the convergence test pattern:
Contrast to maximum
Set the brightness so that the black background of the test
pattern is just brightening.
Feed in a standard test pattern in the upper range of the
UHF band; the RF must be
≥
1.5mV (64dB
µ
V, noise-free
picture) at least.
Info Center –> Special functions –> Service –> Code 8500
–> Tuner AGC.
Tune to a local station on a channel as low as possible at
the desired programme position with standard channel
spacing without fine tuning.
Info Center –> Sonderfunktionen –> Service –> Kennzahl
8500 –> AFC-Reference.
Call up the programme position of the desired TV station.
Infocenter –> Special functions –> Settings –> Colour
match.
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.
Call up the programme position of the desired TV station.
Infocenter –> Picture menu –> Sharpness.
Alignment Process
Set the control R654 to the voltage 152V (28" BM),
146V (28" 16:9), 155V (24" 16:9).
Adjust the coil L511 so that both oscillograms have the
same pulse width.
Re-adjust the horizontal amplitude according to the test
pattern and store.
With the focus control
on the picture tube panel adjust
the horizontal lines for maximum sharpness.
With the buttons
4
3
tune the TV station so that noise
just starts to appear in the picture. Then tune in reverse
direction until the picture just becomes noisefree.
As an alternative, set contact 2 of the tuner to 3.3V
±
0.4V.
Store with OK.
On activation of AFC Reference Automatic a rectified IF-
voltage is measured at the AFC output of the IF amplifier
which is used on station search as a comparative value for
VCR-RF playback (station identification "AV") to readjust
the modulator drift.
Activate with OK.
Adjust with
4
3
buttons to make the signals coincide.
Store with "OK".
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".
Change the value with the
4
3
buttons.
