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Allgemeiner Teil / General Section
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.
Service works after replacement or repair of the following modules:
- Chassis: alignment 1.1
- Tuner, IF amplifier: alignment 1.2, 1.3
- Display or Control Unit, Horizontal Deflection, Picture Tube: alignment 1.2...1.15
- Video Module: alignment 1.5
Abgleich
1.1 +A voltage
Brightness: Minimum
+B voltage
These voltages must be checked after every repair and
+N voltage
before every adjustment.
+F voltage
1.2 Tuner-AGC
Feed in a standard test pattern in the upper range of the UHF
band; the RF must be ≥1.5mV (64dBµV, noise-free picture)
Automatic
at least.
Infocenter –> Special functions –> Service –> Code 8500
–> Tuner-AGC –> Automatic
1.2 Tuner-AGC
Feed in a standard test pattern in the upper range of the UHF
band; the RF must be ≥1.5mV (64dBµV, noise-free picture)
Manual
at least.
Infocenter –> Special functions –> Service –> Code 8500
–> Tuner-AGC –> manuell
or
Digitalvoltmeter: Tuner-Contact 9
1.3 AFC-Reference
Infocenter –> Special functions –> Service –> Code 8500
Automatic
–> AFC-Reference –> Automatic
Tune to a local station on a channel as low as possible at
the desired programme position with standard channel
spacing without fine tuning.
AFC-Reference
Not for Servicing
Def. Value
1.4 Text RGB-Level
Infocenter –> Special functions –> Service –> Code 8500
–> Text RGB-level
1.5 White balance
Black Stretch "off" (Picture Menu)
Infocenter –> Special functions --> Service –> Code 8500
–> White balance
1.6 Bottom flutter
Connect the video recorder and play back the recording.
gate
Infocenter –> Special functions –> Service –> Code 8500
–> Bottom flutter gate
1.7 Type of
Infocenter –> Special functions –> Service –> Code 8500
picture tube
–> Tube type.
1.8 Video
Infocenter –> Special functions –> Service –> Code 8500
processor
–> Video processor
1.9 RGB Sync-
Infocenter –> Special functions –> Service –> Code 8500
level
–> RGB Sync-level
1.10 VM
Infocenter –> Special functions –> Service –> Code 8500
(Velocity Modulation)
–> Velocity Modulation
1.11 Picture
Infocenter –> Picture menu –> Sharpness
sharpness
1.12 Colour match
Infocenter –> Special functions –> Settings –> Colour
match
6
Vorbereitung
Abgleichvorgang
Set control R654 to 150V
Set control R673 to 12V on contact 36 of the Feature-Box
Set control R683 to 5V on contact 32/33 of the Feature-Box
Set control R697 to 5V on contact 9/10 of the Feature-Box
The control processor IC850 will set the optimum value for the
delayed gain control voltage.
Activate with button "OK".
Press "OK". With the buttons
that noise just starts to appear in the picture. Then tune in
reverse direction until the picture just becomes noisefree.
Store with "OK".
adjust ≤ 3.3V
With the buttons
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-HF playback (station identification "AV") to readjust
the modulator drift .
Activate with "OK".
The AFC Reference Def. Value contains only average
values stored during production.
Change the value with buttons
level".
With the
buttons set the VG (amplification green) and
VB (amplification blue) values so that the white rectangular
area in the middle of the picture becomes achromatic.
Store with "OK".
With the
buttons adjust for minimum flutter at the top
or bottom picture edge.
With the
buttons select T82 / 16:9 or T70/16:9
With the
buttons switch the Video processor to
TDA 4686 or TDA 4780 which may be fitted to the TV set.
TDA 4780 contrains the features for Black Stretch, Blue
Stretch and Gamma Control.
In RGB operation it is possible to set the RGB level to "on"
or "off" with the buttons
to eliminate line tearing for
example in this mode.
With the
buttons switch the Velocity Modulation on or off
Adjust with
buttons for optimal picture sharpness
Adjust with
buttons to optimize delays between Y and
chroma (on per-programme basis).
CUC 1822/24/52
tune the TV station so
to "Full level" or "Half
GRUNDIG Service
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