Sony DCR-TRV738E Service Manual page 100

DCR-TRV738E/TRV740/TRV740E/TRV840
3. Contrast Adjustment (PD-156 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
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: NTSC model: DCR-TRV840
PAL model: DCR-TRV738E/TRV740E
Note2: Refer to "LCD Type Check" for the discrimination of the LCD
type.
Note3: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 69
3 C 9
4 0 01
A
Pedestal
VTR stop
No signal
Pin 3 of CN5502 (VG)
Ext. trigger: Pin 4 of CN5502
(PANEL COM)
Oscilloscope
C
69
NTSC 3.5 LCD TYPE CA:
A = 3.18 ± 0.05V
PAL 2.5 LCD TYPE SH:
A = 3.19 ± 0.05V
Procedure
01 Set the data.
Change the data and set the
voltage (A) between the 100 IRE
and 0 IRE (pedestal) to the
specified value.
(The data should be "00" to "7F".)
Press PAUSE button.
00 Set the data.
100 IRE
2H
Fig. 5-1-17.
4. COM AMP Adjustment (PD-156 board)
Set the common electrode drive signal level of LCD to the specified
value.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: NTSC model: DCR-TRV840
PAL model: DCR-TRV738E/TRV740E
Note2: Refer to "LCD Type Check" for the discrimination of the LCD
type.
Note3: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 66
3 C 66
4 0 01
5-34
VTR stop
No signal
Pin 4 of CN5502 (PANEL COM)
Oscilloscope
C
66
NTSC 3.5 LCD TYPE CA:
A = 5.80 ± 0.05V
PAL 2.5 LCD TYPE SH:
A = 6.16 ± 0.05V
Procedure
01 Set the data.
Change the data and set the
PANEL COM signal level (A) to
the specified value.
Press PAUSE button.
00 Set the data.
2H
Fig. 5-1-18.
A