Video Block Diagram - Philips VR407/77 Service Manual

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4.17

VIDEO BLOCK DIAGRAM

MAIN ( VIDEO )
0 3
TO
SYSCON
Fsc
V.PULSE
V TO OSD
I2C DATA A/V
5
I2C CLK A/V
V FROM OSD
TU I2C CLK
TU I2C DATA
4
Q901
TO
TUNER BUF
TU I2C DATA
TU I2C CLK
RF VIDEO
TU VIDEO
3
REAR IN
J1
2
VIDEO
1
REAR OUT
J2
2
VIDEO
1
2
FRONT IN
2
VIDEO
1
ONLY USED FOR
VR620/77 , VR625/77
1
Note : For the waveforms in this block diagram , refer to page 4-25.
A
WF1
Q22
NOT
BUF
USED
26 29 27 30 2
BDL
LPF
C.K
6dB AMP 6dB AMP
N P
C.SQUELCH
B.E
B.D
SQUELCH
WHITE
LIMITER
EXT
CLEAR
SYNC
INT
25
NOT
Sync.Sep.
USED
C.K
L-SECAM L-SECAM
PILOT
ADD
MIX
LEVEL
ADJ
Clamp
REC
AGC
21
PB ALC
D.E.
P
APT CTL N.C.
22
ATT
( -10dB ) R
WF8
20
NOT ATT
( -10dB )
USED
V ideo
AGC
18
ATT
( -10dB )
YNR
16
Y
ATT
(
-10dB) BDL
I2C BDL
Clamp
Interface
46 LPF
DAT A
45
CLK
10 11
FIL TER
B C D
WF3
IC1
TP106
X2
PB.FM
( VIDEO & AUDIO
SIGNAL PROCESSOR )
NOT
USED
WF2
1 34 44 42 40
LPF
X-tal
CR Det. VCO/OSC
2fsc VCO
2fsc
C
VCA
P R
BDL
fH LOCK CTL
R P
LEVEL
Det1 Color Killer PB REC REC PB/REC
APC
ID Det. APC AFC Discri
CLPF Delay
LEVEL
APC ACC Det
Det2
SW
R P
1/2
DOWN 1/2
Conv . 2FL VCO
Phase SW.
Pulse
Gen.
4Phase
CLPF
Gen.
P
Main Main 2M LPF
CTL TRAP
ACC
Conv2 Conv1
fH HPF
R
P
P R R P
HPF
TRAP
R
L-SECAM
P
LPF REC
BPF MUTE
C
R L-SECAM
COMP
SEP .
SQPB
SQPB P 629
FM AGC
G
DL EQ TRAP
R EQ
N.L.
N.L. DET
SQPB
De.Emph
Emph DO
Det
P DLIM
Det
DeMOD
SQPB SQPB
SQPB ET
EQ LPF
ET ET Sub LPF
FBC/ALC
Main
De.Emph
R P
Main Emph
Carrier Offset
DO W.C/D.C
DO
/REC
Y LPF
R P R P P R
Clamp
6 12 13 14 7
WF6
WF7
FIL TER
4-31 4-32 E
X1
38
TP111
WF4
D.FF
TO
SYSCON
92
Head SW1
D.FF CTL D.FF
Head SW2
VIDEO_ ENV
91
HPF ENV DET
ME
100 NOT
SECAM TANC
USED
DET
SP 81
DET
Comp
DET
EP
(LP )
84
YCA
SP2
WF5
+
P
SP2
85
U.DRUM
-
R
CH2 CN1
8 8
SP1
CH1 - 7 7
86
SP1 6 6
+
5 5
+ 4 4
88
REC EP2 3 3
Filter
-
CH2 2 2
EP2
1 1
FM MOD
CH1
-
89
fo/Dev Adj
EP1
S-DET
+
EP1
90
8
TO
SYSCON
NORMAL MESECAM/S
F G
VIDEO
HEAD
8
SP CH2
7
6
SP CH1
5
4
EP/LP CH2
3
2
EP LP CH1
1
H