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參數(shù)資料
| 型號(hào)： | LA7688B |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 |
| 封裝： | 0.600 INCH, DIP-52 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-15/20
Continued from preceding page.
Parameter
Symbol
Test
point
Input
signal
Test method
COLOR VR
CONTRAST
TINT VR
Maximum RGB
output
EBMAXn
O-33
(1)
Y-OFF
chroma
50%
Adjust the SG so that the B output
assumes a horizontal waveform and
measure the Vp-p value of the B output's
signal component.
BRIGHT : 5V
5V
4V
3V
APC pull-in range
Dfscn+
Dfscn-
O-27A
(1)
fsc
frequency
variable
Vary the subcarrier frequency to measure
the pull-in frequency and calculate the
difference from fsc.
2.5V
4V
3V
Tint center
TCEN
O-33
(1)
Y-OFF
Make the relative phase of the SG's
chroma and burst normal.
Adjust the relative phase of the SG's
chroma and burst so that the B output
assumes an oblique linear waveform.
That phase amount adjusted relative to
the normal mode is TCEN.
2.5V
4V
3V
Tint variable range
dPTIN
O-33
(1)
Y-OFF
Adjust the relative phase of the SG's
chroma and burst so that the B output
assumes a horizontal waveform.
(Tint VR : 2.5V) Set the tint VR at 5V and
adjust the relative phase of the SG's
chroma and burst so that the B-Y output
assumes a horizontal waveform ; that
phase amount is +
T.
In the same manner, set the tint VR at 0V
and obtain -
T.
2.5V
4V
1V
↑
3V
↓
5V
R/Bn
O-33
O-35
(2)
Adjust the relative phase of the SG's
chroma and burst so that the B output is
maximized and adjust the color VR so
that the B output becomes 2Vp-p.
And then adjust the relative phase of the
SG's chroma and burst so that the R
output is maximized and measure the R
output's Vp-p. Calculate the ratio to
2Vp-p. (R/B)
Adjust
4V
3V
Demodulation
output ratio
G/Bn
O-33
O-34
(2)
In the same manner, calculate the
demodulation output ratio between the G
output at TP33 and the B output. (G/B)
Adjust
4V
3V
∠RBn
O-33
O-35
(2)
Adjust the relative phase of the SG's
chroma and burst so that the B output
becomes 0 at the demodulation output
ratio R/B's color position. And then adjust
the relative phase of the SG's chroma
and burat so that the R output becomes
0 ; that phase amount is
∠RBn.
Adjust
4V
3V
Demodulation
angle
∠GBn
O-33
O-35
(2)
In the same manner as above, measure
the G output and B output's demodulation
angle
∠GBn.
Adjust
4V
3V
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