Durabrand DCT3203 Service Manual page 21

18. Sub-Brightness Adjustment
Purpose: To get proper brightness.
Symptom of Misadjustment: If Sub-Brightness is
incorrect, proper brightness cannot be obtained by
adjusting the Brightness Control.
Test Point Adj. Point
CH o / p
---
buttons
Tape M. EQ.
Pattern
---
Generator
Figure
White
Note: IQW Setup level --- 7.5 IRE
Use service remote control unit
1. Enter the Service mode. (See page 5-1)
Then input IQW signal from RF Input.
2. Press "MENU" button on the service remote control
unit and Select "BRT" mode. (Display changes
"BRT," "CNT," "CLR," "S-CLR," "TNT," "V-TNT," "S-
TNT," "SHARP," and "S-SRP" cyclically when
"MENU" button is pressed). Press "CH o/p" buttons
so that the bar is just visible (See above figure).
3. Turn the power off and on again. (Main power but-
ton on the TV unit.)
19. Focus Adjustment
Purpose: Set the optimum Focus.
Symptom of Misadjustment: If Focus Adjustment is
incorrect, blurred images are shown on the display.
Test Point Adj. Point
--- Focus Control
Tape M. EQ.
Pattern
---
Generator
Note: Focus VR (FBT) - Main CBA,
FBT=Fly Back Transformer
1. Operate the unit more than 30 minutes.
2. Face the unit to the East and Degauss the CRT
using Degaussing Coil.
3. Input the Monoscope Pattern.
All manuals and user guides at all-guides.com
4. Adjust the Focus Control on the FBT to obtain
The following adjustments normally are not
attempted in the field. Only when replacing the
CRT then adjust as a preparation.
20. Purity Adjustment
Mode Input
Purpose: To obtain pure color.
RF IQW
Symptom of Misadjustment: If Color Purity Adjust-
ment is incorrect, large areas of color may not be
Spec.
properly displayed.
See below
Black
This bar
just
visible
Fig. 4
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. Loosen the screw on the Deflection Yoke Clamper
5. Loosen the Ring Lock and adjust the Purity Mag-
Mode Input
6. Slowly push the Deflection Yoke toward bell of
Mono-
---
scope
7. Tighten the clamp screw on the Deflection Yoke.
Spec.
See below
5-8
clear picture.
Test Point Adj. Point
Deflection
--- Yoke Purity
Magnet
Tape M. EQ.
Pattern
---
Generator
Figure
GREEN RED
ing.
ing coil.
and pull the Deflection Yoke back away from the
screen. (See Fig. 6)
nets so that a red field is obtained at the center of
the screen. Tighten Ring Lock. (See Fig. 5,6)
CRT and set it where a uniform red field is ob-
tained.
Mode Input
Red
---
Color
Spec.
See below.
BLUE
Fig. 5
L6655EA