Read Sharp 28KF-84H (serv.man5) Service Manual online
11
28KF-84H
2. Follow the procedure below to set the Cut Off
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
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
≈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
BLUE CUT OFF
alter «X» and «Y» coordinate.
They will be stored automatically.
Colour Adjustment Alternative Method
In case that the required equipment (Colorimeter /
oscilloscope) is
not available, please follow the procedures below to
obtain correct G2 and Grey scale settings (R-G-B Cut Off).
Alternative Method to set the G2
Follow the procedure below to set the G2:
1. Tune the set to the output of a signal generator (Cross-hatch pattern).
2. In the user menu, set the picture levels to the FACTORY settings (normalized).
3. Connect a DC voltimeter at the Red amplifier output (Pin 9 IC850) and adjust G2 to read 145V
2. In the user menu, set the picture levels to the FACTORY settings (normalized).
3. Connect a DC voltimeter at the Red amplifier output (Pin 9 IC850) and adjust G2 to read 145V
DC (
±
5V).
Alternative Method to set Cut Off
Do not change the Cut RED value (50%).
1. Adjust G2.
2. Tune a grey scale pattern.
3. Adjust colour to minimum.
4. Operate in Service Mode and select location GREEN CUT OFF and BLUE CUT OFF.
5. Adjust these parameters until achieve a correct grey scale tracking.
2. Tune a grey scale pattern.
3. Adjust colour to minimum.
4. Operate in Service Mode and select location GREEN CUT OFF and BLUE CUT OFF.
5. Adjust these parameters until achieve a correct grey scale tracking.
To increase press volume-up button and to decrease press volume down button.
Press the Store button of Remote Control to store all values.
Press the Store button of Remote Control to store all values.
Changing NVM Data
To change the data contained within the Non Volatile Memory, it is necessary to first select the page the data is stored in,
then the position and finally to change the data itself. The procedure below outlines this process.
then the position and finally to change the data itself. The procedure below outlines this process.
1. While on ALTER NVM PAGE, use the volume up/down buttons to change this data (it is shown in hexadecimal format).
2. Press the channel up button and ALTER NVM POSITION appears, use the volume up/down buttons to change this
2. Press the channel up button and ALTER NVM POSITION appears, use the volume up/down buttons to change this
data (it is shown in hexadecimal format).
3. Press the channel up button and ALTER NVM VALUE appears, use the volume up/down buttons to change this data
(data is shown in hexadecimal format).
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