D Range Adjustment (Pk-65/66 Board); Contrast Adjustment (Pk-65/66 Board) - Sony MVC-CD250 Service Manual

MVC-CD250/CD400

5. D Range Adjustment (PK-65/66 Board)

Set the D Range of the RGB decoder for driving the LCD to the
specified value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 A 02
3 4 F1
4 A 85
5 A 85
Processing after Completing Adjustments:
Order Page Address Data
1 A 02
2 4 F1
3 0 01
A
Pedestal
A: Pedestal level difference between 1H period and
previous 1H period.
PLAY
Arbitrary
Pin 9 of CN714 on SY-76 board
(VG)
External trigger: Pin 8 of CN714
on SY-76 board (PANEL_COM)
Oscilloscope
A
85
A = 3.50 ± 0.05 Vp-p
(MVC-CD400)
A = 3.40 ± 0.05 Vp-p
(MVC-CD250)
Procedure
01
03 Press PAUSE button.
03
Change the data and set the
voltage (A) to the specified
value.
Press PAUSE button.
Procedure
00 Press PAUSE button.
00
00
Pedestal
2H
Fig. 5-1-19

6. Contrast Adjustment (PK-65/66 Board)

Set the level of the VIDEO signal for driving the LCD to the speci-
fied value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 A 02
3 4 F1
4 A 8A
5 A 8A
Processing after Completing Adjustments:
Order Page Address Data
1 A 02
2 4 F1
3 0 01
A
Pedestal
A: Between the pedestal and 10 steps peak
5-40
PLAY
Arbitrary
Pin 9 of CN714 on SY-76 board
(VG)
External trigger: Pin 8 of CN714
on SY-76 board (PANEL_COM)
Oscilloscope
A
8A
A = 2.86 ± 0.07 Vp-p
(MVC-CD400)
A = 2.77 ± 0.07 Vp-p
(MVC-CD250)
Procedure
01
03 Press PAUSE button.
03
Change the data and set the
voltage (A) to the specified
value.
Press PAUSE button.
Procedure
00 Press PAUSE button.
00
00
10 steps peak
2H
Fig. 5-1-20