76GF-63 (serv.man5). Important service notes and service adjustments - Sharp TV Service Manual (repair manual). Page 5

The following adjustments should only be carried out when
the CRT, IC801 or IC801 are replaced.

1.1 Tune the set to the output of a signal generator

(cross hatch pattern).

1.2 In the user menu, set contrast to 80/100 and

brightness to 40/100.

1.3 Connect the oscilloscope to the red cathode and

adjust G2 to read 140V on the sensor pulse as
in the drawing:

NOTE:
Oscilloscope should be adjusted for vertical TV field trigger
and synchronized with video signal.

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

nance of 

≈20 

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 

≈120 

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.

RED CUT OFF

 alter «X» coordinate.

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

 alter «X» and «Y» coordinate.

3.3 Exit Service Mode and check colour coordinates

«X» and «Y» at 20 and 120 NITS. It may be nec-
essary to repeat procedure 2 and 3 of Colour
Adjustments.

In the event off a Colorimeter not being available, please
follow the following procedures to obtain correct G2 and
Grey scale settings.

1. Tune the set to the output of a RF signal generator (cross

hatch pattern).

2. In the user menu, set the picture levels to the FACTORY

settings.

3. In the user menu, set the tint control to its central posi-

tion.

4. Enter the service mode.
5. Set the ABL levels in the NVM by adjusting positions 60,

61, 62, 63, 64 and 65 on page 00 to read 80.  Store each
location by pressing the stand-by button on the remote
control.

6. Adjust the G2 and grey scale as below.

When adjusting the grey scale the following boxes will
appear on the screen.

(RED)     (GREEN)     (BLUE)

(GAIN)                  **               **                **
(CUT OFF)      e.g. 70            **

      **

i. Using cross hatch pattern set the G2 so that the dis-

play in the Red cut off box reads between 60 and 80
as above.

NB.  When adjusting the grey scale, the figures dis-

played in the boxes are an indication of the CRT’s
performance only.  The data to be adjusted is con-
tained in the box at the bottom right corner of the
picture.

ii. Select a grey scale signal, then set the Red Cut-off

level to 32 and the Red-Gain to 50.

iii.Leave the Red Cut-off and Gain as above and adjust

Green and Blue Cut-off and Gain to achieve correct
grey scale tracking.  As with all grey scale adjust-
ments it will be necessary to readjust the settings to
achieve good tracking.

CH1 gnd