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5-28
DCR-TRV140/TRV140E/TRV140M
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
CAMERA
Subject
Arbitrary
Measurement Point
Check on LCD display
Measuring Instrument
Adjustment Page
D
Adjustment Address
A4
Note 1:
Perform “RGB AMP Adjustment”, ”Contrast
Adjsutment” and “COM AMP Adjustment” before this
Adjsutment.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
D
A4
Change the data so that
brightness of the section A
and section B is equal.
3
D
A4
Read the data and this data is
named Dref.
4
Convert Dref to decimal
notation, and obtain Dref’.
(Note 2)
5
Calculate D
A4
’ using
following equations.
(decimal calculation)
D
A4
’ = Dref’ - 8
6
Convert D
A4
’ to a hexadeci-
mal number, and obtain D
A4
.
(Note 2)
7
D
A4
D
A4
Press PAUSE button.
8
0
01
00
Note 2:
Refer to table 5-4-1. “Hexadecimal-decimal conversion
table”
4. COM AMP Adjustment (PD-156 board)
Set the common electrode drive signal level of LCD to the speci-
fied value.
Mode
CAMERA
Subject
Arbitrary
Measurement Point
Pin
4
of CN5502 (PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
D
Adjustment Address
A7
Specified Value
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)
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
D
A7
Change the data and set the
voltage (A) to the specified
value.
3
D
A7
Press PAUSE button.
4
0
01
00
A
A
A
A
B
B
B
B
Fig. 5-1-20
A: PANEL COM signal level
Fig. 5-1-19
A
2H