28JW-74H (serv.man18) - Sharp TV Service Manual (repair manual). Page 10

The following adjustments should only be carried out when the CRT or IC850 are replaced.

1.1 Tune the set to the output of a signal generator (monoscope pattern).
1.2 In the user menu, set contrast to 80/100 and brightness to 40/100 (TV normalized).
1.3 Select FULL MODE.
1.4 Enter the Service Mode.
1.5 Select RED GAIN in Service Mode.
1.6 Adjust SCREEN VR so that the OSD value (indicated on Figure 14) reaches 50h ± 8h.

2.1 Adjust G2.
2.2 Tune a white pattern.
2.3 Adjust colour to minimum.
2.4 Position colorimeter in the centre of screen.
2.5 Adjust brightness and contrast to obtain a luminance of 

≈ 3 NITS.

2.6 Operate in Service Mode and select location RED CUT OFF, GREEN CUT OFF and  BLUE CUT OFF, to obtain

colour coordinates:

 X=0.290 ± 0.015       Y=0.284 ± 0.015

To increase press volume-up button and to decrease press volume down button.

RED CUT OFF

 alter «X» coordinate.

GREEN CUT OFF  alter «Y» coordinate.
BLUE CUT OFF

 alter «X» and «Y» coordinate.

3.1 Using brightness and contrast buttons, select a luminance of 

≈100 NITS.

3.2 Operate in Service Mode and select location RED GAIN, GREEN GAIN and  BLUE GAIN, to obtain colour

coordinates:

X=0.290 ± 0.015       Y=0.284 ± 0.015

To increase press volume-up button and to decrease press volume down button.

• When the volume down button is pressed the top and bottom scanning decreases and

the centre scanning increases.

• Press the stand-by button on the remote control to store.

Adjust the Vertical Shift so that the picture is centred.
The effect of this adjustment is shown in figure 13.

• When the volume up button is pressed, the picture moves down.

• When the volume down button is pressed, the picture moves up.

• Press the stand-by button on the remote control to store.

Adjust value

to 50h ± 8h