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13. 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
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 ", " TNT ", " V-TINT ", " S-TINT
" and " SHR " 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.)
Mode
Input
RF
Spec.
See below
Figure
Black
This bar
just
visible
Fig. 4
14. Focus Adjustment
Purpose: Set the optimum Focus.
Symptom of Misadjustment: If Focus Adjustment is
incorrect, blurred images are shown on the display.
Test Point
---
IQW
Tape
---
Note:Focus VR (FBT) - Main CBA FBT=Fly Back Trans-
former
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.
4. Adjust the Focus Control on the FBT to obtain
clear picture.
The following 2 adjustments normally are not
attempted in the field. Only when replacing the
CRT then adjust as a preparation.
15-1. Purity Adjustment
Purpose: To obtain pure color.
Symptom of Misadjustment: If Color Purity Adjust-
ment is incorrect, large areas of color may not be
properly displayed.
Test Point
---
Tape
---
GREEN
1. Set the unit facing east.
2. Operate the unit for over 30 minutes before adjust-
ing.
3. Fully degauss the unit using an external degauss-
ing coil.
5-6
Adj. Point
Mode
Focus Control
---
M. EQ.
Pattern
Generator
Adj. Point
Mode
Deflection
Yoke Purity
---
Magnet
M. EQ.
Pattern
See below.
Generator
Figure
RED
Input
Mono-
scope
Spec.
See below
Input
Red
Color
Spec.
BLUE
Fig. 5
L6250EA
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