Hitachi VTMX900ECT Wartungshandbuch Seite 110

3-28
Video Signal Processing SECAM (VS-SEC)
1 2
5VA
5VA
I072
A
5VA
CSYNC
2074 F072
220p
B
7072
LA7339A
C
MODE
CTL
D
I064
C071 C072
GNDSEC GNDVPO GNDVIO
E
F092
CSI
I089
2083 F077
FSC
10n
89
F
.. OSCILLOGRAMS
..V MEASURED IN PLAYBACK MODE
..V MEASURED IN RECORD MODE
1 2
3 4
5VA
I071
5072
10u
77
I073
2.9V
0.2V 2.8V 5.1V 2.6V
25
28 27 26 24 23 22 21
SECAM 4.3MHz
DET. OSC
SYNC GATE GEN to MUTE
to SYNC GATE
/V-SEP
CA
F0
ADJ.
BGP
to PB AGC
GEN
to REC KILLER
2.2MHz
x2
to MUTE
BPF
CONTROL
LOGIC
F0
AFC CA
ADJ.
Filter
Adj.
F0
4,43MHz
OFFSET
1.1MHz
VCO
OSC
B
1 2 3 3.9V 4 0.4V 5 6 3.9V 7 8 2.5V
4.4V 2V
2.6V
4.5V
5VA
F089
I086
F090
2.6V
BC847BW
7075
2.6V
F088
3 4
3-28
5 6 7
2.6V
BC857BW
7071 I087
3071
2V
47K
4.3V
2.6V
I074
I075
F080
3079
680R
2.6V 2.3V
2.1V 2.7V 4.3V
19
20 18 17 0.9V 16 1.1V 15 2.7V
I077
REC
B /PB
IREF
PB
REC
MUTE
PB
VA
SYNC
4.3MHz
GATE
BPF-A
REC
LIM
4.3MHz
x2
BPF-B
PB
REC
SYNC
1.1MHz
1/4
GATE
BPF
VA PB
REC
MUTE AGC AGC
AMP DET
I091
REG
B
IREF
4.3V
9 2.5V 10 2.2V 11 3V 12 4.3V 13 2.6V 14 3.1V
2.6V 0.4V
2.2V
3095
F086 680R
I095
I084
CHROMA
I082
CURR.
ADJ.
3,3MHz
ADJ.
3.1V
I088
3092
1.1V
47K
3094
I085
I083 12K
5 6 7
Interconnections:
AF page 3-27 AL page 3-24
FV page 3-21 FOME page 3-34 I/O page 3-33
8 9
F078
PBH
F079
VREC
5VA
79
2096
100n
5.2V
5.1V
2.7V
I076 I090
3070 88
0.5V
7073
BC847BW
1K F081
CSRP
2V
2.4V
5VA
5.2V
5.1V
0.8V
3V 7077
BC847BW
2V
2.4V
I079
87
I081
2086 F084
FMPV
10n
8 9
AIO1 page 3-17 AIO2 page 3-15 DE page 3-19 FM ST page 3-22 FM NIC-page 3-23
PS page 3-14 VPO page 3-32 VS page 3-31
2071 A4 I074 A5
2072 A4 I075 B6
2073 A3 I076 B7
2074 B2 I077 B7
2075 A6 I079 E7
2076 A4 I080 F3
2077 B5 I081 F7
2079 B7 I082 F5
2080 E7 I083 F5
A
2081 E4 I084 F5
2082 E4 I085 F5
2083 E1 I086 F5
2084 F6 I087 A6
2085 F6 I088 F5
2086 F7 I089 E1
2087 F4 I090 B8
2088 F3 I091 D7
2089 F3 I095 E6
2090 F3
2096 A9
2097 B8
B
3070 B7
3071 A6
3072 A2
3073 A5
3074 A2
3075 A5
3076 A5
3078 B5
3079 B7
3082 E5
3083 F5
C
3084 F2
3085 F4
3086 F3
3087 F4
3088 F5
3089 F5
3091 F4
3092 F6
3094 F6
3095 E7
5071 A5
5072 A3
D
5073 B7
5074 E7
5075 F4
7071 A6
7072 B2
7073 B8
7075 F5
7077 E8
C071 D1
C072 D1
F072 B2
F073 B4
E
F074 B5
F075 B5
F076 A6
F077 E2
F078 A8
F079 A8
F080 B6
F081 B9
F084 F8
F085 E6
F086 E5
F
F087 E5
F088 F4
F089 F4
F090 F4
F091 E3
F092 E1
I064 D1
I071 A4
I072 A2
I073 B4
VS_S page 3-28