Circuit Operating Descriptions
Samsung Electronics
14-15
14-8 IF
1) SAW FILTER
It passes only needed band of the signal that is converted to IF frequency and decrease the others band to
minimize the effect of adjacent channel.
2) RF AGC Control
It used adjusting to determine RF AGC working point in tuner.
3) VCO Tank
When VCO tank detects PLL, it makes the signal which sets a standard.
4) AFT (Auto Frequency Tuning)
AFT automatically controls the oscillator frequency in the tuner, so that it retains a constant level.
It is a quadrature detection type. The carrier, which is detected from video det is directly input to AFT.
The 90 degree delayed phase signal is input at the same time to AFT and, the results come out.
5) IF AMP
IF signal , which is selected in Saw filter, is amplified in IF amp frequency enough to be detected. The IF amp
has parallel inputs & outputs structure.
FM Det
AFT
Lim Amp
1
2
4
5
6
10
11
12
24
21
19
14
15
16
17
Video Amp
N.S.C
APC Tine
Const SW
Lock Det
IF AGC
EQ.Amp
B/W
VCD
AGC
RF AGC Amp
Pra
Amp
Mix
APC
Det
Video Det
4.5 MHz
Tunlng
AFT Tank
SIF filter
4.5MHz
SIF Trap
VCD Tank
3
4
5
6
+B
AUDIO OUT
AFT OUT
VIDEO OUT
To Tuner Section
RF AGC
To Tuner Section
From
Tuner Section
a
b
c
d
SAM Filter
RF AGC Control
(IF Amp)
Fig. 14-12
Summary of Contents for DVD-VR320/COM
Page 32: ...5 22 Disassembly and Reassembly Samsung Electronics MEMO ...
Page 68: ...Troubleshooting 6 36 Samsung Electronics MEMO ...
Page 76: ...Exploded View and Parts List 7 8 Samsung Electronics MEMO ...
Page 216: ...Circuit Operating Descriptions Samsung Electronics 14 17 Fig 14 12 IC601 Block Diagram ...
Page 249: ...Circuit Operating Descriptions 14 50 Samsung Electronics MEMO ...
