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Center of white level
7
fe
220 +10 mV
at
Optical black level
Fig. 7-34,
2.
Auto White Balance Adjustment (CV-8 Board)
Note: Be sure to perform this adjustment after completing
Preset Adjustment.
Subject
White pattern standard picture frame
Filter C14
for black temperature
Filter
correction
Measuring Instrument | Oscilloscope (X-Y Mode)
CHI (X): collector of Q643 or
emitter of Q645 (B-Y)
CH2.(Y): collector of 0613 or
emitter of Q618 (R-Y)
Measurement Point
01 (DELTA R)
02 (DELTA B)
80 (R OUTDOOR)
81 (B OUTDOOR)
7 (B UP LILIT)
79 (B OUT LIMIT)
65 (TOP SLP R)
66 (MDL SLP R)
73 (TOP UP)
74 (TOP DWN)
78 (R OUT LMT)
Adjustment Address
Line up the white luminance point
_
with the black luminance point.
Spei
Note: 1) Make connection to the video output terminals when
the vectorscope is used.
2) All calculations in this section are made in decimal.
Adjustment method:
1)
Select adjustment address 89 (AWB
MODE)
with the
adjustment remote commander and enter adjustment data of
10.
2)
Change the adjustment data of adjustment addresses 01 and
02 with the adjustment remote commander to move the
white luminance point and black luminance point.
(Move the white luminance point to pthe origin point when
using the vectorscope.)
The adjustment data of adjustment address 01 is Di and the
adjustment data of adjustment address 02 is D2.
3) Select adjustment address 80 and enter adjustment data
Dit. Select adjustment address 81 and enter adjustment
data D2+3. (Outdoor white balance adjustment.)
4)
Convert adjustment data Di to decimal to obtain Di'.
Convert adjustment data Dz to decimal to obtain D2'.
(See Table 7-5 Hexadecimal-Decimal Conversion Table)
5) Obtain D77' by the following formula.
D77'=(D2' X 1.9) 43.2
6)
Convert D77' to hexadecimal and call this value D77.
(Round off the decimal portion)
7)
Select adjustment address 77 with the adjustment remote
commander and enter adjustment data D77.
Enter adjustment data D1 to adjustment address 78.
8)
Obtain D79" by the following formula.
D79'=D2'+10
9) Convert D79' to hexadecimal and call this value D79.
10) Select adjustment address 79 with the adjustment remote
commander and enter adjustment data D79.
11) Obtain d' by the following formula.
d'=(Dr' x 5) + D2'
The adjustment procedure in 12) through 14) varies
according to the value of d'.
Id' > 308]
12) Obtain D73' and D74' by the following formulas.
D73'=(D1' x 3) + (D2' + 2) + 30
D7a'=D73'— 42
13) Convert D73' and D74' to hexadecimal and call these values
D73 and D7.
(Round off the decimal portion)
14) Use the adjustment
remote
commander
to enter
the
adjustment data shown in the table below for the indicated
adjustment addresses.
.
Adjustment address
Adjustment data
65
20
66
ol
73
Dz
74
Dv
Perform the adjustment steps beginning from 15).
[308 2 d' = 286)
12) Obtain D73' and D74' by the following formulas.
Dr3'=(d' + 2) +25
D74'=D73'-39
13) Convert D73' and D74' to hexadecimal and call these values
D73 and D7.
(Round off the decimal portion)
14) Use the adjustment
remote
commander
to enter the
adjustment data shown in the table below for the indicated
adjustment addresses.
Adjustment address
Adjustment data
Perform the adjustment steps beginning from 15).
— 219 —
[286 >.d']
12) Obtain D73' and D74' by the following formulas.
D73'=(Di' X 3) + D2'+30
D74'=D73'—42
13) Convert D73' and D74' to hexadecimal and call these values
D73 and D74. (Round off the decimal portion)
14) Use
the
adjustment
remote
commander
to
enter
the
adjustment data shown in the table below for the indicated
adjustment addresses.
rc
(Example)
When the adjustment data obtained in Step 2) has the following
values.
Adjustment | Adjustment
address
data
5
Enter 2A+1 into
ut
2A
—* adjustment address 80
Adjustment address
Adjustment data.
15) Select adjustment address 89 and enter adjustment data 00.
16) Select adjustment address 89 and enter adjustment data FO.
17) Change the adjustment data of adjustment addresses O1 and.
02 with the adjustment remote commander
to move
the
white luminance point and black luminance point.
(Move the white luminance point to the origin point when
using the vectorscope.)
18) Select adjustment address 89 and enter adjustment data of
00.
19) Change the adjustment address to store the adjustment data
in the memory.
R-Y
White luminance
i
e
point
Black luminance point
or origin point
Move the white
luminance point
to the origin point.
Fig, 7-35.
Enter into 53+3
hid
ad
adjustment address 81
Di=2A and D2=53 when there is conversion to decimal using
Table 7-5.
Di'=42
D2'=83
Thus,
D77'=(83 x 1.9)-43.2=114.5
Rounding off the decimal portion and converting to hexadecimal
by Table 7-5 results in,
D7=72— Entered into adjustment address 77
In the same manner,
D79"=(83+10)=93
D79=SD > Entered into adjustment address 79
In addition,
d'=(42 x 5)}483=293
Thus, [308 = d' = 286]
D73'=(293 + 2)4+25=171.5
.. D73=AC-
Entered into adjustment address 73
D74'=171.5~39=132.5
.'. D74=85-> Entered into adjustment address 74
Also, adjustment data of 41 is entered into adjustment address 65,
and adjustment data of 01 is entered into adjustment address 66.
The steps beginning from 15) are then performed.
— 220 —
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