Alignment - Grundig Davio 37 Service Manual

GRUNDIG Service

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: alignment 2.
- IC34015: alignment 3.
- CRT, CRT plate: alignment 6...9.
- Deflection: alignment 9.
- NVM CIC82501: alignment 2...6 and 9.
Alignment
1. +A voltage This voltage must be checked and re-adjusted if necessary
after every repair and before every alignment.
Brightness:
Contrast:
Digital voltmeter:
2. Tuner AGC 100MHz oscilloscope: Channel A: Tuner contact 11.
Colour video generator: Feed in a colour scale (with switched-
Call up the dialog line "AGC" via " " (Dialog Center) –>
Service –> "OK" –> Service Code "8500".
3. AFC Colour video generator: Feed in a colour scale with standard
Call up the dialog line "AFC" via " " (Dialog Center) –>
Service –> "OK" –> Service Code "8500".
4. OSD Call up the dialog line "OSD" (horiz. or vertic.) via " " (Dialog
Center) –> Service –> "OK" –> Service Code "8500".
5. OEM Call up the dialog line "OEM" via " " (Dialog Center) –>
Service –> "OK" –> Service Code "8500".
6. White Balance Colour video generator: Feed in a grey scale with burst.
Contrast:
Colour contrast:
Screen brightness:
Call up dialog line "White adjustment" via " " (Dialog Center)
–> Service –> "OK" –> Service Code "8500".
7. Screen grid Colour video generator: Feed in a black test pattern.
voltage U
G2
Oscilloscope
100:1 test probe:
Determine the test point having the highest voltage.
Preparations
Minimum
Minimum
Cathode D61016
Ground: Tuner
off sound carrier) via the aerial,
≥80dBµV.
channel spacing without finetuning
in Band 1 (channel 2...4).
maximum
mid-position
mid-position
Adjust the screen brightness so that
the test pattern just turns dark.
Test points R, G, B
(picture tube plate).
2 - 3
Alignment Process
Adjust +A acc. to the table (page 3-18) on the power
supply circuit diagram with R60516 resp. R60414 (Modu-
le Mains Unit 12V, page 3-4).
Adjust 300mV using button
pp
Exit the dialog line "End" with "with mem" –> "OK".
Press the „OK" button. The alignment is carried out
automatically.
Exit the dialog line "End" with "with mem" –> "OK".
With button or position the menu in the middle of the
picture.
Exit the dialog line "End" with "with mem" –> "OK".
With button or select "off".
Exit the dialog line "End" with "with mem" –> "OK".
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 " " then exit the
dialog line "End" with "with mem" –> "OK".
Use the UG2 control (splitter transformer) to adjust at the
test point having the highest voltage potential a voltage of
112.5V +/- 2.5V for 14" picture tubes, and a voltage of
150V +/- 2.5V for 15"...21" picture tubes.
CUC 2105, 2121, 2121 M
or .