5-36
8. VG Center Adjustment (SY-66 Board)
Set the center of VG signal for driving the LCD to the specified
value.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Pin
9
of CN706 (VG)
Measuring Instrument
Digital voltmeter
Adjustment Page
D
Adjustment Address
D6
Specified Value
A = 7.00
±
0.05 V
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
4
F1
02
Change the data and set the
3
D
D6
DC voltage (A) to the specified
value.
4
D
D6
Press PAUSE button.
Processing after Completing Adjustments:
Order Page Address Data
Procedure
1
4
F1
00
2
0
01
00
9.
V-COM Adjustment (SY-66 Board)
Set the DC bias of the common electrode drive signal of LCD to
the specified value.
If deviated, the LCD display will be move, producing flicker and
conspicuous vertical lines.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Check on the LCD screen
Measuring Instrument
Adjustment Page
D
Adjustment Address
D8
Specified Value
The brightness difference
between the section-A and
section-B is minimum
Note 1:
Perform “Bright Adjustment” and “Contrast Adjusstment”
before this adjustment.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
4
F1
02
3
4
10
02
4
D
D8
Change the data so that
brightness of the section A
and section B is equal.
5
D
D8
Read the data and this data is
named Dref.
6
Convert Dref to decimal
notation, and obtain Dref’.
(Note 2)
7
Calculate D
D8
’ using
following equations.
(decimal calculation)
D
D8
’ = Dref’ – 13
8
Convert D
D8
’ to a hexadeci-
mal number, and obtain D
D8
.
(Note 2)
9
D
D8
D
D8
Press PAUSE button.
Note 2:
Refer to table 5-2-2. “Hexadecimal-decimal conversion
table”.
Processing after Completing Adjustments:
Order Page Address Data
Procedure
1
4
F1
00
2
4
10
00
3
0
01
00
Fig. 5-1-25
A
A
A
A
B
B
B
B