Contrast Adjustment (Pd-126 Board); Center Level Adjustment (Pd-126 Board) - Sony DSR-250 Service Manual

4. Contrast Adjustment (PD-126 board)

Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode VTR stop
Signal No signal
Measurement Point Pin 1 of CN2105 (VG)
Measuring Instrument Oscilloscope
Adjustment Page D
Adjustment Address AA
Specified Value A = 3.10 ± 0.05V
Adjusting method:
Order Page Address Data
1 0 01 01
2 D AA
3 D AA
4 0 01 00
5
3 steps peak
A
Pedestal
Fig. 5-1-21.
Procedure
Set the data.
Change the data and set the
voltage (A) between the 3 steps
peak and pedestal to the
specified value.
(The data should be "00" to
"7F".)
Press PAUSE button.
Set the data.
Check that the specified value of
"Bright Adjustment" is satisfied.
2H

5. Center Level Adjustment (PD-126 board)

Set the video signal center level of LCD panel to an appropriate
level.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 3 0C
3 3 22
4 D AB
5 D AB
6 3 0C
7 3 22
8 0 01
5-32
VTR stop
No signal
Pin 1 of CN2105 (VG)
Digital voltmeter
D
AB
A = 7.00 ± 0.05Vdc
Procedure
01 Set the data.
60 Set the data, and press PAUSE
button.
08 Set the data, and press PAUSE
button.
Change the data and set the DC
voltage (A) to the specified
value.
(The data should be "00" to
"7F".)
Press PAUSE button.
00 Set the data, and press PAUSE
button.
00 Set the data, and press PAUSE
button.
00 Set the data.