Sylvania SRT2232S Service Manual page 18

11. Cut-off Adjustment
Purpose: To adjust the beam current of R, G, B, and
screen voltage.
Symptom of Misadjustment: White color may be
reddish, greenish or bluish.
Test Point Adj. Point
Screen-Control
--- CH o / p
buttons
Tape M. EQ.
Pattern
---
Generator
PATTERN GENERATOR
RF INPUT
Note: Screen Control FBT --- Main CBA
F.B.T= Fly Back Transformer
Use Service remote control unit
1. Degauss the CRT and allow CRT to operate for 20
minutes before starting the alignment.
2. Input the Black Raster Signal from RF Input.
3. Enter the Service mode. (See page 5-1)
4. Press " VOL p " button on the Service remote con-
trol unit and select " C/D " mode. (Display changes
" C/D ", " CHROMA ", " 7F ", " LANGUAGE ", "
STEREO TYPE ", " ACCESS CODE ", " STABLE
SOUND ", " COMB FILTER ", " COMPONENT "
and " AV MEMORY " cyclically when " VOL p "
button is pressed.) then press " 1 ". The display will
momentarily show " CUT OFF R " (R= Red). Now
there should be a horizontal line across the center
of the picture tube. If needed gradually turn the
screen control on the flyback, clockwise until the
horizontal line appears. Adjust the Red Cut off by
pressing the " CH o / p " buttons. Proceed to Step
5 when the Red Cut off adjustment is done.
5. Press the " 2 "button. The display will momentarily
show " CUT OFF G " (G=Green). Adjust the Green
Cut off by pressing the " CH o / p " buttons. Proceed
to step 6 when the Green Cut off adjustment is done.
6. Press the " 3 " button. The display will momentarily
show " CUT OFF B " (B=Blue). Adjust the Blue cut
off by pressing the " CH o / p " buttons. When
done with steps 4, 5 and 6 the horizontal line
should be pure white if not, then attempt the Cut off
adjustment again.
Mode
RF
Raster
Spec.
See Reference
Notes below.
Figure
Fig. 2
12. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Test Point
Input
Black
Screen
Tape
Note: Use Service remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to east. Degauss the CRT using De-
gaussing Coil.
3. Input the White Raster (APL 100%).
4. Set the color analyzer to the CHROMA mode and
after zero point calibration, bring the optical recep-
tor to the center on the tube surface (CRT).
5. Enter the Service mode. Press " VOL p " button on
the Service remote control unit and select " C/D "
mode. (Display changes " C/D ", " CHROMA ", " 7F
", " LANGUAGE ", " STEREO TYPE ", " ACCESS
CODE ", " STABLE SOUND ", " COMB FILTER ",
" COMPONENT " and " AV MEMORY " cyclically
when " VOL p " button is pressed.) then Press No. 8
button on the Service remote control Unit.
6. Press No. 4 button on the service remote control
unit for Red adjustment. Press N0. 5 button on the
Service remote control unit for Blue adjustment.
7. In each color mode, Press " CH o / p " button to ad-
just the values of color.
8. Adjusting Red and Blue color so that the temperature
becomes 9200K (x: 286 / y: 294)±3%.
9. At this time, Re-check that Horizontal line is white.
If not, Re-adjust Cut-off Adjustment until the Hori-
zontal Line becomes pure white.
10. Turn off and on again to return to normal mode. Re-
ceive APL 100% white signal and Check Chroma
temperatures become 9200K (x: 286 / y: 294)±3%.
Note: Confirm that Cut Off Adj. is correct after this
adjustment, and attempt Cut Off Adj. if needed.
5-5
Adj. Point Mode
CH o / p
RF
buttons
M. EQ.
Pattern
Generator,
Color analyzer
Figure
Color Analyzer
Input
White
Raster
(APL
100%)
Spec.
See below
Fig. 3
L6250EA