Sanyo AVM-2550S Training Manual page 44

VIF/SIF Processing Circuit
Tuner
AGC IF
SAW
DC
Level
RF
AGC
IF VCC
RF AGC
Control l
Conventional RF AGC Adjustment System
Special Signal
Input
IC101 Signal Processor
A101
(VIF/SIF Processing Circuit)
Tuner
AGC IF
X141
SAW
C106
+7.6V
RF AGC
Amp.
R142
DC Level
A/D
R862
Input
BUS
Interface
R864 C862
BUS
Data
IC801 A1901
IC802
CPU R/C
Memory
(C-003) Receiver
AVM-2780G Automatic RF AGC Adjustment System
VIF
Video Video
Amp.
Detector Amp.
IF
AGC
VIF Video Video
Amp. Detector Amp.
IF AGC 2nd AGC IF
Drive Fiter AGC
RF AGC Delay
Write
6 bit Control Register
R/C
Transmitter
Video/Chroma
Processing CRT
Circuit
Audio
Processing Speaker
Circuit
Video/Chroma
Processing CRT
Circuit
Audio
Processing Speaker
Circuit
– 41 –
This curve can be moved to
r right or left by the RF AGC
Delay Control Register.
DOMAIN OF
DISTORTION
79/128 Vcc
DOMAIN
OF NOISE
0 68
ANTENNA INPUT (dB µ ) - 75 Ω / open
RF AGC A/D Input Voltage