Magnavox CT202MW8, Руководство по обслуживанию, Страница: 25 / 89

1-7-4 P7753EA
5. Cut-off/Drive 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 --- Sub CBA
FBT = Fly Back Transformer
Use the service remote control unit
1. Degauss the CRT and allow the unit to operate for
20 minutes before starting the alignment.
2. Input the Black raster signal from RF input.
3. Enter the Service mode in TV mode.
4. Press [VOL
n
] button on the service remote
control to enter "C/D" mode. (Display changes "C/
D," "7f," "TUNER," "SLP R," "MONO," "DTV-H/-H2,"
"RATING," "RC5" "DL V-CHIP," and "D-SOUND"
cyclically when [VOL
n
] button is pressed.)
5. Press [1] button on the service remote control unit
and select "COR" mode.The display will
momentarily show "COR". 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 the "[CH.
o
/
p
]" buttons. Proceed to
Step 6 when the Red Cut off adjustment is done.
6. Press [2] button on the service remote control unit
and select "COG" mode. The display will
momentarily show "COG". Adjust the Green Cut
off by pressing the "[CH.
o
/
p
]" buttons. Proceed
to step 7 when the Green Cut off adjustment is
done.
7. Press [3] button on the service remote control unit
and select "COB" mode. The display will
momentarily show "COB". Adjust the Blue cut off
by pressing the "[CH.
o
/
p
]" buttons. When done
with steps 5, 6 and 7 the horizontal line should be
pure white, If not, then attempt the Cut off
adjustment again.
6. 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 the east. Degauss the CRT using
a 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 in TV Mode.
6. Press [VOL
n
] button on the service remote
control to enter "C/D" mode. (Display changes "C/
D," "7f," "TUNER," "SLP R," "MONO," "DTV-H/-H2,"
"RATING," "RC5" "DL V-CHIP," and "D-SOUND"
cyclically when [VOL
n
] button is pressed.)
7. Press [4] button on the service remote control unit
for Red adjustment. Press [5] button on the service
remote control unit for Blue adjustment.
8. 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
RF 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