Contrast Adjustment (Pd-85 Board) - Sony DCR-TRV7 Service Manual

5. Contrast Adjustment (PD-85 Board)

Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will not be consistent or will be
blackish or saturated (whitish).
VTR playback
Mode
Audio operation check tape,
Signal
color bar portion
Pin 1 of CN9928 (VG) on CB-58 board
Measurement Point
Measuring Instrument Oscilloscope
D
Adjustment Page
Adjustment Address 63
Specified Value A = 3.45 ± 0.05V
Adjusting method:
1) Set data: 01 to page: 0, address: 01.
2) Input the following data to page: D, addresses: 82 and 83.
82
Address
00
Data
Note: Press the PAUSE button of the adjusting remote
commander each time to set the data.
3) Change the data of page: D, address: 63, and set the voltage (A)
between the pedestal and white 100% to the specified value.
4) Press the PAUSE button of the adjusting remote commander.
5) Input the following data to page: D, addresses: 82 and 83.
Address
82
Data 20
Note: Press the PAUSE button of the adjusting remote
commander each time to set the data.
6) Set data: 00 to page: 0, address: 01.
7) Check that the specified value of "Bright Adjustment" is satisfied,
if not, perform "Bright Adjustment".
83
00
83
20
For NTSC model
White 100%
A
For PAL model
A
5–27
2H
White 100%
2H
Fig. 5-1-17.