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NOTE:
Oscilloscope should be adjusted for vertical TV field trigger and synchronized with video signal.
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 ≈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
To increase press volume-up button and to decrease press volume down button.
RED CUT OFF
GREEN CUT OFF
BLUE CUT OFF
They will be stored automatically.
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.
1. While on ALTER NVM PAGE, use the volume up/down buttons to change this data (data 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
data (data 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).
4. Once this data has been set, press the stand-by button to store.
5. If another NVM value has to be changed, use the channel down button to select the page or position and repeat as
necessary.
Note:
DO NOT change any NVM data, unless you have been advised to do so by a Sharp representative. If data is incorrectly
changed, serious damage may occur to the receiver.
Contrast Adjustments
Three types of contrast levels can be varied as listed below:
• TELETEXT MIX MODE CONTRAST
• TELETEXT CONTRAST
• OSD CONTRAST
Use the volume up/down buttons to adjust to a suitable level, they will be stored automatically.
DVCO Adjustment (PAL)
Carry out the DVCO Adjustment (PAL) as shown below:
1. Receive a color pattern signal (PAL).
2. While in the DVCO ADJUSTMENT (PAL) menu, press the stand-by button.
3. The adjustment will be carried out automatically and stored.
Y=0.300 ± 0.015
alter «X» coordinate.
alter «Y» coordinate.
alter «X» and «Y» coordinate.
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28JS-74S
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