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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
RF INPUT
Note: Screen Control FBT --- Main CBA
FBT= Fly Back Transformer
Use 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. (See page 1-6-1.)
4. Press "VOL p" button on the service remote
control unit to enter "C/D" mode. 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.
All manuals and user guides at all-guides.com
The following 2 adjustments normally are not
attempted in the field. They should be done
only when replacing the CRT then adjust as a
preparation.
12. Purity Adjustment
Mode
Input
Purpose: To obtain pure color.
Symptom of Misadjustment: If Color Purity Adjust-
Black Ras-
ment is incorrect, large areas of color may not be
RF
ter
properly displayed.
Spec.
Test point
See Reference
Notes below.
GREEN
Fig. 5
* This becomes RED COLOR if the 7KEY is pressed
1. Set the unit facing east.
2. Operate the unit for over 30 minutes before adjust-
3. Fully degauss the unit using an external degauss-
4. Set the unit to the AUX mode which is located
5. Loosen the screw on the Deflection Yoke Clamper
6. Loosen the Ring Lock and adjust the Purity Mag-
7. Slowly push the Deflection Yoke toward the bell of
8. Tighten the clamp screw on the Deflection Yoke.
1-6-6
Adj. Point
Deflection Yoke
---
Purity Magnet
Tape
M. EQ.
---
Pattern Generator
Figure
RED
while in service mode.
ing.
ing coil.
before CH2, then input a red raster from video in.
and pull the Deflection Yoke back away from the
screen. (See Fig. 7.)
nets so that a red field is obtained at the center of
the screen. Tighten Ring Lock. (See Fig. 6,7.)
the CRT and set it where a uniform red field is
obtained.
Mode
Input
---
*Red Color
Spec.
See below.
BLUE
Fig. 6
T8201EA
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