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

Mode

 

Input

 

 

 

 

 

 

---

CH o / p

RF

 

IQW

buttons

 

 

 

 

 

 

 

 

 

 

 

 

 

Tape

M. EQ.

 

Spec.

 

 

 

 

 

 

---

Pattern

See below

Generator

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure

 

 

 

White

Black

 

 

This bar

 

just

 

visible

 

Fig. 4

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

Mode

 

Input

 

 

 

 

 

---

Focus Control

---

 

Mono-

 

scope

 

 

 

 

 

 

 

 

 

Tape

M. EQ.

 

Spec.

 

 

 

 

 

---

Pattern

See below

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.

4.Adjust the Focus Control on the FBT to obtain clear picture.

The following adjustments normally are not attempted in the field. Only when replacing the CRT then adjust as a preparation.

20. 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

Adj. Point

Mode

 

Input

 

 

 

 

 

 

 

 

 

 

 

 

 

Deflection

 

 

Red

---

Yoke Purity

---

 

 

Color

 

Magnet

 

 

 

 

 

 

 

 

 

 

 

 

 

Tape

M. EQ.

 

Spec.

 

 

 

 

 

 

---

Pattern

See below.

Generator

 

 

 

 

 

 

 

 

 

 

 

 

Figure

 

 

 

 

GREEN

RED

BLUE

Fig. 5

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.

4.Loosen the screw on the Deflection Yoke Clamper and pull the Deflection Yoke back away from the screen. (See Fig. 6)

5.Loosen the Ring Lock and adjust the Purity Mag- nets so that a red field is obtained at the center of the screen. Tighten Ring Lock. (See Fig. 5,6)

6.Slowly push the Deflection Yoke toward bell of CRT and set it where a uniform red field is ob- tained.

7.Tighten the clamp screw on the Deflection Yoke.

5-8

L6650EA

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Sylvania SRT2232X service manual Sub-Brightness Adjustment, Focus Adjustment, Purity Adjustment

SRT2232X specifications

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