-7-
F2HT
IC BLOCK DIAGRAMS
IF
AMPLIFIER
AGC
VER
TICAL
OUTPUT
PHASE 1
DEMODULA
TOR
AFC AND
SAMPLE
AND HOLD
VER
TICAL
DIVIDER
LINE
OSCILLA
T
O
R
VIDEO
IDENTIFICA
TION
VIDEO
AMPLIFIER
POWER
RESET
H AND
V
SEP
ARA
TION
NOISE
DETECT
OR
PREAMPLIFER
MUTE
SWITCH
VOLUME
PHASE 2
XT
AL
OSCILLA
T
O
R
HUE
CONTROL
TUNING
SYSTEM
MANAGER
PHASE
DETECOR
DEMODULA
T
O
R
COLOUR
KILLERS
COINCIDENCE
DETECT
OR
ACC
AMPLIFIER
MA
TRIX
CLAMPS
SET
CLAMP
SWITCH
OUTPUT
ST
AGES
LUMINANCE
MA
TRIX
CHROMINANCE
BANDP
ASS
PWL
Y
DELA
Y
PEAKING
CHROMINANCE
SWITCH
LUMINANCE
SWITCH
TRAP
AND
BYP
ASS
TUNING
PLL
TEST
LIMITER
SUPPL
Y
IF IN1
IF IN2
TUNE ADJ
FM DEM1
FM DEM2
AUDEM
EXT
AU
SOIF
DEC
DIG
GND2
GND3
Vp
DEC
FT
CHROMA
CVBS
EXT
PEAK IN
CON
COLOUR
RGBIN
BRI
RO
GO
BO
BI
GI
RI
FROM
TDA4661
TO
TDA4661
DET
HUE
XT
AL
OUT
XT
AL2
XT
AL1
H OUT
FBI/SCO
PH2LF
H OSC
PH1LF
V RAMP
VFB
V OUT
AFCOUT
DEC
AGC
AGC OUT
AU OUT
IDENT
45
46
49
2
3
7
1
6
51
5
8
11
9
10
52
12
16
13
15
14
25
26
21
17
20
19
18
24
23
22
29
28
31
30
33
27
32
35
34
37
38
39
36
40
42
41
43
44
48
47
50
4
TDA8361
BYI
BYO
BYO
RY
I
IFVO
CVBS
INT
DEC BG
DECDEM
TDA8361 <IF/VIDEO/CHROMA/DEF.>