iLO IWF2706 Service Manual page 20

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
Figure
Pattern Generator
Ext. Input
Note: Screen Control FBT --- Main CBA
FBT = 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
control unit and select "C/D" mode. (Display
changes "C/D", "7F", "VIDEO", "AV MEMO",
"STABLE SOUND", "300", "YUV MEMORY", and
"NO SIG BRT" 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 [CH o / p] buttons. Proceed to Step 5
when the Red Cut off adjustment is done.
5. Press [2] button. The display will momentarily
show "CUT OFF G" (G = Green). Adjust the Green
Cut off by pressing [CH o / p] buttons. Proceed to
step 6 when the Green Cut off adjustment is done.
6. Press [3] button. The display will momentarily
show "CUT OFF B" (B = Blue). Adjust the Blue cut
off by pressing [CH o / p] buttons. When done
12. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Mode Input
Symptom of Misadjustment: White becomes bluish
Black or reddish.
RF
Raster
Spec.
See Reference
Notes below.
Fig. 2
Note: Use service remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to east. Degauss the CRT using
3. Input the White Raster (APL 100%).
4. Set the color analyzer to the CHROMA mode and
5. Enter the Service mode. (See page 5-1.) Press
6. Press [4] button on the service remote control unit
7. In each color mode, Press [CH o / p] buttons to
8. Adjusting Red and Blue color so that the
5-5
with steps 4, 5 and 6 the horizontal line should be
pure white if not, then attempt the Cut off
adjustment again.
Test Point Adj. Point
[CH o / p]
Screen
buttons
Tape M. EQ.
Pattern
--- Generator,
Color analyzer
Figure
Degaussing Coil.
after zero point calibration, bring the optical
receptor to the center on the tube surface (CRT).
[VOL p] button on the service remote control unit
and select "C/D" mode. (Display changes "C/D",
"7F", "VIDEO", "AV MEMO", "STABLE SOUND",
"300", "YUV MEMORY", and "NO SIG BRT"
cyclically when [VOL p] button is pressed.) then
Press [8] button on the service remote control
Unit.
for Red adjustment. Press [5] button on the
service remote control unit for Blue adjustment.
adjust the values of color.
temperature becomes 9200K (x: 286 / y: 294)±3%.
Mode Input
White
Raster
RF
(APL
100%)
Spec.
See below
Color Analyzer
Fig. 3
L4803EA