Tuner Section; Video Section - Sanyo DCS-AVD8501 Service Manual

IC BLOCK DIAGRAM & DESCRIPTION

-TUNER SECTION-

IC201 TA8176SN (FM Front End)
5
7 8
Vcc
Vcc
MIXER
AGC
1
BY-PASS 2
AGC DET
RF IN
3
IC203 LC7212M-D (PLL Synthesizer)
Vssx 2
REFERENCE
XIN 1
DIVIDER
XOUT 24
SWALLOW COUNTER
FMIN 17 1/2
1/16, 1/17 4bits
12bits PROGRAMMABLE
AMIN 16
CE
3
DI
4
CCB
DATA SHIFT REGISTER LATCH
I / F
CL
5
6
DO
POWER
V
18 ON
DD
RESET
Vssd 15
8
7
BO1 BO2 BO3 BO4

VIDEO SECTION

IC211~213 NJM4558M (Operational Amplifier)
A OUTPUT
1
A
A -INPUT
2
A +INPUT
3
VEE(-)
4
9 4 6 10
IF
Buffer
Local
Buffer
Amp
Buffer
BIAS
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
DIVIDER
UNIVERSAL
COUNTER
9 10 11 14
IO1 IO2
VCC(+)
8
7 B OUTPUT
B
6 B -INPUT
B +INPUT
5
IC202 LA1844ML (AM/FM-ZF MPX)
24 23 22
ALC
AM
AM
MIX
OSC
BUFF
11 OSC
OSC
LEVEL
AM/FM
DET
12 BUFFER
S-CURVE
OUT
FM
FM
IF
DET
REG
1 2 3
19 PD
20 AIN
21 AOUT
22 Vssa
13 IFIN
IC221 LA7952 (Video Switch)
Driver
1
VIDEO
OUT
Truth Table
A
H
L
H
L
- 64 -
21 20 19 18 17
AM
RF.AMP
AGC
P-DET
AM
AM
ø
DET
IF
IF
COMP
BUFF
304kHz
TUNING
DRIVE
GND
4 5 6 7 8
6dB
Amp
4 Input / 1Output
Control
Video Switch
2 3 4 5 6
A B V GND V V
IN1 IN2
B V V
IN1 IN2
H ON OFF
H OFF ON
L OFF OFF
L OFF OFF
16 15 14 13
PILOT
DECODER
CANCEL
ANTI-BIRDIE
STEREO
SW
VCO FF FF FF
PILOT
„
38k 19k 19k
DET
2
VCC
9 10 11 12
7 8 9
V V
CC IN3 IN4
V V
IN3 IN4
OFF OFF
OFF OFF
ON OFF
OFF ON