M 2106
Abgleich / Alignment
LOEWE.-Service
2 - 3
GB
Alignment
Attention!
1. Carry out the alignment with the unit at operating temperature (about 15 min.).
2. Keep the "Sub. Contrast" setting unchanged (factory setting).
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.
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, video demodulator: alignment 2, 3
- IC34015: alignment 3
- CRT, CRT panel: alignment 5…8
- Deflection: alignment 7, 8
- NVM CIC82501: alignment 2…5 and 8.
"M" button –> Call up "TV-menu" or go back to previous menu.
"E" button –> Exit menu.
Cursor buttons
3 4
–> Select dialogue line.
Cursor buttons
1 2
–> Change setting.
Adjust +A acc. to the table (page 3-15) on the power
supply circuit diagram with R60516.
Adjust 300mV
pp
with button
1
or
2
.
Terminate the dialog line "End" "with mem" –> "OK".
Press the "OK“ button. The alignment is carried out
automatically.
Terminate the dialog line "End" "with mem" –> "OK".
With button
1
or
2
position the menu in the middle of the
picture.
Terminate the dialog line "End" "with mem" –> "OK".
With button
1
or
2
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 "M" and terminate the
dialog line "End" "with mem" –> "OK".
Use the U
G2
control (splitter transformer) to adjust at the
test point having the highest voltage potential a voltage of
150V
±
2.5V for 15"...21" picture tubes.
1. +A voltage
2. Tuner AGC
3. AFC
4. OSD
5. White Balance
6. Screen grid
voltage U
G2
This voltage must be checked and re-adjusted if necessary
after every repair and before every alignment.
Brightness:
Minimum
Contrast:
Minimum
Digital voltmeter:
Cathode D61016
100MHz Oscilloscop: Channel:
Tuner contact 10 or 11.
Ground:
Tuner
Colour video generator:
Feed in a standard test pattern or
generator via the aerial,
≥
80dB
µ
V.
Call up the dialog line "AGC" via "TV-menu" –> "Settings"
–> "Special functions" –> "Service" –> Service Code "8640".
Colour video generator: Feed in with standard channel
spacing without finetuning in Band1
(channel 2…4).
Call up the dialog line "AFC" via "TV-menu" –> "Settings"
–> "Special functions" –> "Service" –> Service Code "8640".
Call up the dialog line "OSD" (horiz. bzw. vertic.) via "TV-
menu" –> "Settings" –> "Special functions" –> "Service" –>
Service Code "8640".
Colour video generator:
Feed in a grey scale black/white test
pattern with burst.
Contrast:
maximum
Colour contrast:
mid-position
Screen brightness:
mid-position
Call up dialog line "WHITE ADJUSTMENT" via "TV-menu"
–> "Settings" –> "Special functions" –> "Service" –> Service
Code "8640".
Colour video generator:
Feed in a black test pattern.
Adjust the screen brightness so
that the test pattern just turns dark.
High-resistance volt-
meter via 220k
Ω
:
Test points R, G, B
(picture tube plate).
Determine the test point having the highest voltage.
Alignment
Preparations
Alignment Process