Circuit Operating Descriptions
7-35
(4) Tuner Block
A. Low pass filter & high pass filter
This consists of IF trap circuit and UHF & VHF separation circuit. If the input signal is IF(45.75MHz), this filter
prevents interference.
B. Single tune & RF AMP
This consists of a filter circuit, RF AMP, impedance conversion circuit, image trap and a single tuning circuit. It
prevents noise and other interference signals. RF AMP is controlled by AGC come from IF DEMOD block.
C. Double tune
It consists of a double tuning circuit to improve rejection characteristic which results in a better band characteris-
tic.
D. MOP IC (Mixer, OSC, PLL)
It consists a VHS and UHF OSC and mixer circuit. We applied a double balance mixer to have better rejection
characteristic, it shows especially various beat characteristic.
It serects channels and contains charge pump band driver. The minimum step standard frequency 27.97KHZ.
AGC
from IF Section
Prescaler
REF
C.P.
LPF
Tu voltage
out
Fsc IN
Tu
Clock
Data
+B
IF
to IF Section
VL
VH
U
BAND SW
MOP IC
CXA3250AN (SONY)
SN761672A (TEXAS Instruments)
FROM
MD SECTION
L.P.F
H.P.F
S.T(VL)
S.T(U)
S.T(VL)
D.T(VL)
V.MIX
VHF
OSD
UHF
OSD
OSC
AMP
IF
AMP
U.MIX
IF S.T
D.T(VH)
D.T(U)
V.RF Amp
U.RF Amp
H.P.F
+
IF trap
Fig. 7-32 Tuner Section Block Diagram
Summary of Contents for SV-DVD40
Page 82: ...Circuit Operating Descriptions 7 7 Fig 7 12 Block Diagram ...
Page 116: ...Circuit Operating Descriptions 7 41 3 Block Diagram Fig 7 38 LA70100M Block Diagram ...
Page 141: ...VCR Deck Operating Description 8 12 Samsung Electronics Fig 8 14 Mecha Timing Chart ...
Page 156: ...Samsung Electronics 11 1 11 Wiring Diagram ...
Page 158: ...Schematic Diagrams 12 2 Samsung Electronics 6 1 S M P S ...
Page 159: ...Schematic Diagrams Samsung Electronics 12 3 6 2 Power Drive ...
Page 160: ...Schematic Diagrams 12 4 Samsung Electronics DT701 6 3 Display Function ...
Page 161: ...Schematic Diagrams Samsung Electronics 12 5 6 4 System Control Servo ...
Page 162: ...Schematic Diagrams 12 6 Samsung Electronics 6 5 A V ...
Page 163: ...Schematic Diagrams Samsung Electronics 12 7 6 6 Hi Fi ...
Page 164: ...Schematic Diagrams 12 8 Samsung Electronics 6 7 A2 NICAM ...
Page 165: ...Schematic Diagrams Samsung Electronics 12 9 6 8 SECAM Option ...
Page 166: ...Schematic Diagrams 12 10 Samsung Electronics 6 9 OSD VPS PDC ...
Page 167: ...Schematic Diagrams Samsung Electronics 12 11 6 10 TM ...
Page 168: ...Schematic Diagrams 12 12 Samsung Electronics 6 11 Input Output ...
Page 169: ...Schematic Diagrams Samsung Electronics 12 13 6 12 DVD AV Decoder ...
Page 170: ...Schematic Diagrams 12 14 Samsung Electronics 6 13 DVD Servo ...
Page 171: ...Schematic Diagrams Samsung Electronics 12 15 6 14 DVD Audio Video ...
