76GF-63H
Colour AdjustmentsTo increase press volume-up button and to decrease
press volume down button.
The following adjustments should only be carried out when
the CRT, IC801 or IC801 are replaced.RED CUT OFF alter ?X? coordinate.
GREEN CUT OFF alter ?Y? coordinate.
BLUE CUT OFF alter ?X? and ?Y? coordinate.
G2, Cut Off and Gain Adjustments
3.3 Exit Service Mode and check colour coordinates
1. Follow the procedure below to set the G2?X? and ?Y? at 20 and 120 NITS. It may be nec-
1.1 Tune the set to the output of a signal generatoressary to repeat procedure 2 and 3 of Colour
(cross hatch pattern).Adjustments.
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 asG2, Cut Off and Gain Adjustments (alternative method).
in the drawing:
In the event off a Colorimeter not being available, please
follow the following procedures to obtain correct G2 and
Grey scale settings.
140 V
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-CH1 gnd
tion.
4. Enter the service mode.
NOTE:5. Set the ABL levels in the NVM by adjusting positions 60,
Oscilloscope should be adjusted for vertical TV field trigger61, 62, 63, 64 and 65 on page 00 to read 80. Store each
and synchronized with video signal.location by pressing the stand-by button on the remote
control.
6. Adjust the G2 and grey scale as below.
2. Follow the procedure below to set the Cut Off.
2.1 Adjust G2.When adjusting the grey scale the following boxes will
2.2 Tune a white card.appear on the screen.
2.3 Adjust colour to minimum.
2.4 Position colorimeter in the centre of screen.(RED) (GREEN) (BLUE)
2.5 Adjust brightness and contrast to obtain a lumi-
nance of H20 NITS.(GAIN) ** ** **
2.6 Operate in Service Mode and select location RED(CUT OFF) e.g. 70 ** **
CUT OFF, GREEN CUT OFF and BLUE CUT
OFF, to obtain colour coordinates:
X=0.290 ? 0.015 Y=0.284 ? 0.015i. Using cross hatch pattern set the G2 so that the dis-
play in the Red cut off box reads between 60 and 80
To increase press volume-up button and to decrease pressas above.
volume down button.
NB. When adjusting the grey scale, the figures dis-
played in the boxes are an indication of the CRT?s
RED CUT OFF alter ?X? coordinate.performance only. The data to be adjusted is con-
GREEN CUT OFF alter ?Y? coordinate.tained in the box at the bottom right corner of the
BLUE CUT OFF alter ?X? and ?Y? coordinate.picture.
ii. Select a grey scale signal, then set the Red Cut-off
3. Follow the procedure below to set the GAIN.level to 32 and the Red-Gain to 50.
3.1 Using brightness and contrast buttons, select a
luminance of H120 NITS.iii.Leave the Red Cut-off and Gain as above and adjust
3.2 Operate in Service Mode and select location REDGreen and Blue Cut-off and Gain to achieve correct
GAIN, GREEN GAIN and BLUE GAIN, to obtaingrey scale tracking. As with all grey scale adjust-
colour coordinates:ments it will be necessary to readjust the settings to
X=0.290 ? 0.015 Y=0.284 ? 0.015achieve good tracking.
8 |
ACEC
SHARP
