Sony DCR-TRV230E Service Manual page 174

7. Contrast Adjustment (PD-139 board)
(DCR-TRV230E/TRV235E/TRV325E/TRV330E/TRV530E)
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 3 of CN5502 (VG)
External trigger: Pin 4 of CN5502
(PSIG)
Measuring Instrument Oscilloscope
Adjustment Page D
Adjustment Address AA
Specified Value 2.5 LCD TYPE SO (61k)
2.5 LCD TYPE SO (123k)
3.5 LCD TYPE SO (123k)
Note: Refer to "LCD Type Check" for the discrimination of the LCD type.
Adjusting method:
Order Page Address Data
1 0 01 01
2 D AA
3 D AA
4 0 01 00
100 IRE
A
Pedestal
Fig. 5-1-22.
A = 2.80 ± 0.07V
A = 2.54 ± 0.07V
A = 2.76 ± 0.07V
Procedure
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.
Set the data.
2H
8. Center Level Adjustment (PD-139 board)
(DCR-TRV230E/TRV235E/TRV325E/TRV330E/TRV530E)
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 D AB
3 D AB
4 0 01
5-33
VTR stop
No signal
Pin 3 of CN5502 (VG)
Digital voltmeter
D
AB
A = 7.00 ± 0.03Vdc
Procedure
01 Set the data.
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.