Sharp 70FW-53E, Руководство по обслуживанию

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8
70FW-53E
140 V
CH1 gnd
To increase press volume-up button and to decrease press volume down button.
RED GAIN OFF alter «X» coordinate.
GREEN GAIN OFF alter «Y» coordinate.
BLUE GAIN 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 necessary to
repeat procedure 2 and 3 of Colour Adjustments.
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 PAG, 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 POS appears, use the volume up/down buttons to change this data (data
is shown in hexadecimal format).
Colour Adjustments
The following adjustments should only be carried out when the CRT or IC1801 are replaced.
G2, Cut Off and Gain Adjustments
1. Follow the procedure below to set the G2
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. 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 Y=0.300 ± 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. Follow the procedure below to set the GAIN.
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=0.300 ± 0.015