Sony KP-53SV75A, KP-43T75A service manual Section, SET-UP Adjustments

KP-43T75A/53SV75A	SECTION 3
RM-Y906 RM-Y906
	SET-UP ADJUSTMENTS

3-1. SCREEN VOLTAGE ADJUSTMENT (COARSE ADJUSTMENT)

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.

R G B

SCREEN

R G B

FOCUS

Fig. 3-1

FOCUS block

3-2. SCREEN (G2) ADJUSTMENT (FINE ADJUSTMENT)

Fine Mode is recommended to set screen controls to their optimal condition. It is necessary to build the simple jig, illustrated below, using 3-watt resistors. Please note, that if the proper voltage is not obtained with their listed values, resistors, then please increase or decrease one of the values in the resistor network to obtain the correct voltage.

1.Select VIDEO1 mode without signals.

2.Connect G2 JIG.

3.SW on JIG.

4.Connect an oscilloscope to the TP701(KR), TP732(KG) and TP761(KB) of CR board, CG board and CB board.

5.Adjust R, G and B screen voltage to 168-172V with screen VR on the Focus block.

K

G2 JIG

SW

2.2k 4.7k 5.6k 5.6k

200V GND

the mode Cover the both green and red picture lenses with the lens caps is aligned the same as was done for green.

Note: Instead of items 3 and 6, you can cut off the unnecessary color beams by controlling the service mode VPTR 17 RON, 18 GON, and 19 BON.

	4-pole magnet
2-pole magnet	Deflection yoke

Fig. 3-3 Anode cap

3-4. FOCUS LENS ADJUSTMENT

In this adjustment, use the remote commander in the service mode.

For details of the usage of the service mode and the remote commander, please refer the item 3-9. ELECTRICAL ADJUSTMENT BY REMOTE COMMANDER.

1.Loosen the lens screw.

2.Set to the service mode.

3.Receive the all-white signal.

4.Cover the both red and blue picture lenses with the lens caps to show only the green color.

5.Set to PJE, and press 6 to display the test signal (crosshatch)“ on the screen.

6.Turn the green lens to adjust to the optimum focus point with the test signal.

7.Tighten the lens screw.

8.Cover the both green and blue picture lenses with the lens caps to show only the red color.

9.Set to PJE, and press 6 to display the test signal (crosshatch)“ on the screen.

10.Adjust red CRT lens just the same as green.

11.Cover the both green and red picture lenses with the lens caps to show only the blue color.

170 ± 2V pedestal level

GND

Fig. 3-2

3-3. DEFLECTION YOKE TILT ADJUSTMENT

1.Receive the Monoscope signal.

2.Set in service mode.

3.Cover the both red and blue picture lenses with the lens caps to show only the green color.

4.Loosen the deflection yoke set screw and align the tilt of the Deflection Yoke so that the bars at the center of the monoscope pattern are horizontal.

5.After aligning the deflection yoke, fasten it securely to the funnel-shaped portion (neck) of the CRT.

6.The tilt of the deflection yoke for red is aligned in the mode Cover the both green and blue picture lenses with the lens caps and the tilt of the deflection yoke for blue is aligned with in

Test signal Fig. 3-4

12.Set to PJE, and press 6 to display the test signal (crosshatch)“ on the screen.

13.Adjust blue CRT lens just the same as green.

14.After adjusting the items 3-5. Focus VR Adjustment, 3-6. 2- Pole Magnet Adjustment and 3-7. 4-Pole Magnet Adjustment, adjust again to the optimum focus point.

*: Every time you press 6, the test signal changes to “crosshatch+video signal” - “dots+video signal” - “crosshach(black)” - “dots(black)” - off.

Note: Instead of items 4, 8 and 11, you can cut off the unnecessary color beams by controlling the service mode VPTR 17 RON, 18 GON, and 19 BON.

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