Durabrand CB130DR8, Service Manual

Page: 20 / 55

5-5 P7100EA
12. 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.
Note: Screen Control FBT --- Main CBA
FBT = Fly Back Transformer
Use the 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
n
] button on the service remote
control unit and select “C/D” mode. (Display
changes “C/D,” “7F,” “SOUND TYPE,” “VIDEO,”
“1000,” “YUV MEMORY,” “TUNER A/M/S,” “QAM,”
“DTV-H,” “D-SOUND,” and “DL V-CHIP” cyclically
when [VOL
n
] 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,
turn the screen control on the flyback in a
clockwise direction gradually 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
with steps 4, 5 and 6 the horizontal line should be
pure white, if not, then attempt the Cut off
adjustment again.
13. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Note: Use the service remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to east. Degauss the CRT using
Degaussing 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
receptor to the center on the tube surface (CRT).
5. Enter the Service mode. (See page 5-1.) Press
[VOL
n
] button on the service remote control unit
and select “C/D” mode. (Display changes “C/D,”
“7F,” “SOUND TYPE,” “VIDEO,” “1000,” “YUV
MEMORY,” “TUNER A/M/S,” “QAM,” “DTV-H,” “D-
SOUND,” and “DL V-CHIP” cyclically when [VOL
n
] button is pressed). Then press [8] button on the
service remote control unit.
6. Press [4] button on the service remote control unit
for Red adjustment. Press [5] button on the
service remote control unit for Blue adjustment.
7. In each color mode, Press [CH
o
/
p
] buttons to
adjust the values of color.
Test Point Adj. Point Mode Input
---
Screen-Control
[CH
o
/
p
]
buttons
RF
Black
Raster
Tape M. EQ. Spec.
---
Pattern
Generator
See Reference
Notes below.
Figure
Fig. 2
Pattern Generator
Ext. Input
Test Point Adj. Point Mode Input
Screen
[CH
o
/
p
]
buttons
RF
White
Raster
(APL
100%)
Tape M. EQ. Spec.
---
Pattern
Generator,
Color Analyzer
See below
Figure
Fig. 3
Color Analyzer