2.14 Adjustments, English
Focus
- To get access to the FOCUS potentiometer in the EHT transformer, pull out the
main chassis.
- Adjust to optimum focusing of the vertical lines as viewed approx. 10cm/4” from
the edge of the screen by means of the FOCUS potentiometer in the EHT
transformer (see
➢
3).
Picture adjustments
Picture adjustments shall only be done in format 1 (4:3) and must be done in a
dark room.
- Select PICTURE in the OPTIONS menu and set the values for BRIGHTNESS,
CONTRAST and COLOUR to the mid position. Press
GO
to store.
- Enter Service Mode and select the MONITOR line.
- Select the PICTURE ADJUSTMENTS line.
- Check that BRIGHTNESS, CONTRAST and COLOUR in CURRENT VALUES must
show 32.
Some of the adjustments are fi xed and should not be adjusted:
- OFFSETS
REGULATIONS:
- BRIGHTNESS
19
CONTRAST 22
COLOUR
9
SOFT
CLIP
0
PWL
10
- Adjust R-DR, G-DR and B-DR to correct white level.
- Adjust BLACK OFFSET R and BLACK OFFSET G to correct grey level.
G2 Adjustment (see
➢
3).
H-CENTER in GEOMETRY ADJUSTMENTS must be made before G2 adjustment.
- To get access to the SCREEN potentiometer in the EHT transformer, pull out the
main chassis.
- Select the G2 ADJUSTMENT line in the PICTURE ADJUSTMENTS menu by pressing
n
.
The screen now turns black. Adjust by means of the SCREEN potentiometer in the
EHT transformer until the Stand By LED turns green (red = G2 too high, yellow = G2
too low, green = G2 ok). Then press
GO
to return to the PICTURE ADJUSTMENTS
menu.
Geometry adjustments
Illustrations for
- Adjustments
- Geometry
parameters
-
Geometry measuring points
All measurements concerning the geometry are measured without the contrast
screen mounted.
Measurements are performed with a ruler directly on the picture tube.
All measurements are measured from the phosphors edge, unless other is
specifi ed.
For the best result, measurements are preformed in a straight angle to the picture
tube, e.g. you see into the refl ection of your own eye.
Geometry must be checked and adjusted in format
4:3, FORMAT 1
16:9, FORMAT 2