Chassis Board - Grundig CUC2021 Servise Manual

CUC 2021
Alignment
GB
Attention!
After any repair or replacement of NVM (IC82005) check whether the NTSC 3.58MHz quartz (Q34044, page 3-3) is fitted. If it is not, the dialog line
"NTSC 3.6" in the Service Menu must be set to "off".
Button " " –> "OK" –> SERVICE –> "OK" –> SERVICE Code "8500" –> NTSC 3.6 "off" and in dialog line "END" store the setting "with mem.".
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.

Chassis Board

Measuring instruments: Digital voltmeter, colour video generator, spectrum analyser, RF millivoltmeter
Service works after replacement or repair of the following modules:
- Power supply: alignment 1.
- Tuner: alignment 2.
- IF, video demodulator: alignment 2.
- CRT, CRT panel: alignment 7...9.
- Deflection: alignment 9.
- NVM IC82005: alignment 2...7., 10...11
Alignment
1. +A voltage This voltage must be checked and re-adjusted if necessary
after every repair and before every alignment.
Brightness: Minimum
Digital voltmeter: Cathode D61016
2. Tuner AGC Spectrum analyser or RF millivoltmeter unsymmetrical to
tuner contact 10, 11.
Feed in a standard test pattern or generator via the aerial,
70...80dBµV.
Call up the dialog line "AGC" via " " (DIALOG CENTER) –>
"OK" –> SERVICE –> "OK" –> Service Code "8500".
3. OSD Call up the dialog line "OSD" via " " (DIALOG CENTER) –>
"OK" –> SERVICE –> "OK" –> Service Code "8500".
4. Tube Call up the dialog line "Tube" via " " (DIALOG CENTER)
–> "OK" –> SERVICE –> "OK" –> Service Code "8500".
(Type of picture
tube)
5. Overscan Call up the dialog line "Overscan" via " " (DIALOG CENTER)
(switch-off –> "OK" –> SERVICE –> "OK" –> Service Code "8500".
behaviour of
tube)
6. NTSC 3.6 Call up the dialog line "NTSC 3.6" via " " (DIALOG CENTER)
–> "OK" –> SERVICE –> "OK" –> Service Code "8500".
7. White Balance Feed in a grey scale test pattern with burst.
Contrast ( ) to maximum.
Colour contrast ( ) to mid-position.
Screen brightness ( ) to mid-position.
Call up dialog line "WHITE ADJUSTMENT" via " " (DIALOG
CENTER) –> "OK" –> SERVICE –> "OK" –> Service Code
"8500".
8. Cut-off Align Call up dialog line "Cut-off align" via " " (DIALOG CENTER)
(screen grid –> "OK" –> SERVICE –> "OK" –> Service Code "8500".
voltage U )
G2
9. Line Sharpness Feed in a convergency test pattern.
Contrast ( ) to maximum.
Set the screen brightness ( ) so that the black
background of the test pattern just starts to brighten.
GRUNDIG Service
Preparations Alignment Process
Adjust R60037 acc. to the table on the power supply circuit
diagram.
Adjust 102dBµV (360mV ) with button
pp
Alternatively, without using a spectrum analyser 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 the dialog line "End" "with mem.".
With button or position the menu in the middle of the
picture.
Terminate the dialog line "End" "with
With button or enter the correct screen diagonal.
Terminate the dialog line "End" "with mem."
With button or select "off".
Terminate the dialog line "End" "with mem."
With button or select "on " for models with NTSC or
"off" for models without NTSC.
Terminate the dialog line "End" "with mem."
With button or set the values for "Green" and
"Blue" so that the picture becomes achromatic.
Check this alignment at minimum and maximum contrast.
Go back to the "SERVICE" menu with " " and terminate
the dialog line "End" "with mem.".
With adjustment control U (Split transfo), adjust the line
G2
appearing first - red, green, blue or mixed-colour - so that
it is just well visible.
Return to the menu with "OK".
With focus control U (Split transfo), adjust the vertical
F
lines approx. 5cm from the right and left picture edge to
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.
Abgleich / Alignment
or .
or so
mem.".
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