Contrast Adjustment (Pd-143 Board); Com Amp Adjustment (Pd-143 Board) - Sony DCR-TRV15E Service Manual

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4. Contrast Adjustment (PD-143 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 3 of CN5502 (PANEL VG)
External trigger: Pin 4 of CN5502
(PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
D
Adjustment Address
AA
Specified Value
A = 3.34 ± 0.07V (LCD TYPE S)
A = 3.00 ± 0.07V (LCD TYPE C)
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
100IRE
A
Pedestal
Fig. 5-1-18.
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

5. COM AMP Adjustment (PD-143 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
Note: Refer to "LCD Type Check" for the discrimination of the LCD type.
Adjusting method:
Order Page Address Data
1
0
01
2
D
A7
3
D
A7
4
0
01
A
5-32
VTR stop
No signal
Pin 4 of CN5502 (PANEL COM)
Oscilloscope
D
A7
2.5 LCD TYPE S
A = 6.33 ± 0.05V
3.5 LCD TYPE S
A = 6.10 ± 0.05V
3.5 LCD TYPE C
A = 5.50 ± 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. 5-1-19.

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