Chassis 12.6
Abgleich / Alignment
GRUNDIG Service
2 - 3
Alignment
Start of the Service Mode: Via "
Ǻ
" (Dialog Center) –> Service –> "OK" –> Service Code "8500".
End the Service Mode: Press button "TXT".
Measuring instruments: 100MHz oscilloscop with 10:1 test probe, digital voltmeter, colour video generator.
Service works after replacement or repair of the following modules:
- Power supply: alignment 1
- IF: alignment 2
- IC101 (Video IC), EEPROM: alignment 2
- CRT, CRT panel: alignment 6…8
- Deflection: alignment 7
- IC402: alignment 2…5 and 7…8
- Tuner: alignment 2 and 3
1. +B voltage
2. IF
B/G,D/K,I Standard
3. Tuner AGC
3.1 "2.AGC"
B/G,D/K,I Standard
4. OSD
5. OEM
6. Screen grid
voltage
This voltage must be checked and re-adjusted if necessary
after every repair and before every alignment.
Brightness:
Minimum
Contrast:
Minimum
Digital voltmeter:
Cathode D607
Start the Service Mode; call up the dialog line "Video" via
menu 1 (red button) with button
Ƕ
.
Feed in a standard signal of a TV station. Set fine tuning to
"00" and store it via "OK".
Start the Service Mode; call up the dialog line "AFT38" via
menu 4 (blue button) with button
Ƕ
or
ǵ
.
100MHz oscilloscope: Channel A: Tuner contact 11
Ground:
Tuner
Colour video generator: Feed in a colour scale (with
switched-off sound carrier) via the
aerial:
channel 32; 70
±
1dB
µ
V.
Start the Service Mode; call up the dialog line "AGC" via
menu 1 (red button) with button
Ƕ
or
ǵ
.
Call up the dialog line "2.AGC" with button
Ƕ
or
ǵ
.
Start the Service Mode; call up the dialog line "OSD.H" and
"OSD.V" via menu 2 (green button) with button
Ƕ
or
ǵ
.
Start the Service Mode; call up the dialog line "OEM" via
menu 1 (red button) with button
Ƕ
or
ǵ
.
Start the Service Mode; call up the dialog line "SCRN" via
menu 3 (yellow button) with button
Ƕ
or
ǵ
.
Switch on the horizontal line with button
Ǹ
or
Ƿ
.
Adjust +B to the values below with P601:
Size
CRT
Voltage Value
14"
A34LPE02X01
106V
20"
A48ECR43X51
118V
21"
A51EER133X41
118V
With button
Ƿ
set to "NEW".
End the Service Mode.
With button
Ǹ
or
Ƿ
set the right Hex-value to 78-7C
(e.g.: AFT38 87 79).
End the Service Mode.
With button
Ǹ
or
Ƿ
set to the following values:
PAL B/G standard
750mV
pp
±
20mV
pp
PAL/SECAM B/G/D/K standard
750mV
pp
±
20mV
pp
PAL I standard
700mV
pp
±
20mV
pp
End the Service Mode.
With button
Ǹ
or
Ƿ
set the same value like AGC value less 5.
Example: AGC = 48 -> 2.AGC = 48 - 5 = 43
End the Service Mode.
With button
Ǹ
or
Ƿ
position the picture to the center of the
screen. End the Service Mode.
With button
Ǹ
or
Ƿ
set to "off".
End the Service Mode.
With "SCREEN" control (lower control at the splitter
transformer) adjust the line so that it is just well visible.
Alignment
Preparations
Alignment Process
