Sony KP-41T65C service manual Screen Voltage Adjustment Rough Alignment, Screen G2 Adjustment

SECTION 3

SET-UP ADJUSTMENTS

3-1. SCREEN VOLTAGE ADJUSTMENT (ROUGH ALIGNMENT)

1.Receive the Monoscope signal.

2.Set 50% BRIGHTNESS and minimum PICTURE.

3.Turn the red VR on the FOCUS block all the way to the left and then gradually turn it to the right until the point where you can see the retrace line.

4.Next gradually turn it to the left to the position where the retrace line disappears.

3-3. SCREEN (G2) ADJUSTMENT

1.Select VIDEO mode without signals.

2.Connect an oscilloscope to the TP701(KR), TP731(KG) and TP761(KB) of CR board, CG board and CB board.

3.Adjust R, G and B screen voltage to 170 – 173V with screen VR on the focusblock.

R G B

SCREEN

R G B

FOCUS

FOCUS block

Fig. 3-1

3-2. FOCUS LENS ADJUSTMENT

1.Loose the lens screw.

2.Set in service mode.

3.Use VP on the service mode menu to shown only the green color.

4.Press the Commander Menu button and select FEATURES and CONVERGENCE to display the test signal (crosshatch) on the screen.

5.Rotate the green lens and align with the optimal focus point from the test signal.

6.Use RG-RH from the service mode menu to set to green and red.

7.Output the test signal and rotate the red lens to obtain the optimum focus at the point where the red and green spots overlap.

8.Use RG-BH from the service mode menu to set to red and blue.

9.Output the test signal and rotate the blue lens to obtain the optimum focus at the point where the blue and red spots over- lap.

10.Tighten the lens screw.

Test signal

Fig. 3-2

170 –173V pedestal

GND

Fig. 3-3

3-4. FOCUS VR ADJUSTMENT

1.Set in service mode.

2.Use VP on the service mode menu to shown only the green color.

3.Press the Commander Menu button (convergence) and out- put the test signal (crosshach).

4.Rotate the green VR on the FOCUS block and align to ob- tain the optimal focus point.

5.Use RG-RH from the service mode menu to set to green and red.

6.Output the test signal and rotate the red VR to obtain the optimum focus at the point where the red and green spots overlap.

7.Use RG-BH from the service mode menu to set to red and blue.

8.Output the test signal and rotate the blue VR aligning to ob- tain the optimum focus at the point where the blue and green spots overlap.

Scanning line visible.

A

A Minimize both A and B.

LensBB

Fig. 3-4 Fig. 3-5

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