Com Amp Adjustment (Pd-156 Board); V-Com Adjustment (Pd-156 Board) - Sony DCR-TRV140 Service Manual

DCR-TRV140/TRV140E/TRV140M

4. COM AMP Adjustment (PD-156 board)

Set the common electrode drive signal level of LCD to the speci-
fied value.
Mode
Subject
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 D A7
3 D A7
4 0 01
A: PANEL COM signal level
CAMERA
Arbitrary
Pin 4 of CN5502 (PANEL COM)
Oscilloscope
D
A7
NTSC model
A=6.30 ± 0.05 Vp-p (TYPE S model)
A=5.45 ± 0.05 Vp-p (TYPE C model)
PAL model
A=6.10 ± 0.05 Vp-p (TYPE S model)
A=5.45 ± 0.05 Vp-p (TYEP C model)
Procedure
01
Change the data and set the
voltage (A) to the specified
value.
Press PAUSE button.
00
2H
Fig. 5-1-19

5. V-COM Adjustment (PD-156 board)

Set the DC bias of the common electrode drive signal of LCD to
the specified value.
If deviated, the LCD display will move, producing flicker and con-
spicuous vertical lines.
Mode
Subject
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Note 1: Perform "RGB AMP Adjustment", "Contrast
Adjsutment" and "COM AMP Adjustment" before this
Adjsutment.
Adjusting method:
Order Page Address Data
1 0
2 D A4
3 D A4
4
5
A
6
7 D A4
8 0
Note 2: Refer to table 5-4-1. "Hexadecimal-decimal conversion
table"
5-28
CAMERA
Arbitrary
Check on LCD display
D
A4
Procedure
01 01
Change the data so that
brightness of the section A
and section B is equal.
Read the data and this data is
named Dref.
Convert Dref to decimal
notation, and obtain Dref'.
(Note 2)
Calculate D ' using
A4
following equations.
(decimal calculation)
D ' = Dref' - 8
A4
Convert D ' to a hexadeci-
A4
mal number, and obtain D
(Note 2)
D Press PAUSE button.
A4
01 00
A
B
A
B
B A
A
B
Fig. 5-1-20
.
A4