Olympus OEP-3 Service Manual page 127

(2) Y/C separation block
A digital comb filter (IC101) is used to separate the luminance signal (Y) and chroma signal (C) of a
composite video signal.
The input composite video signal is passed through a band rejection filter (FL101), amplified by
about four times, and input to pin 15 of IC101. The separated luminance signal is output from pin 6
and passed through a band rejection filter. After that, the signal is input to the video switch (IC104)
that switches the luminance signal of an S video signal. In the same manner as described above, a
chroma signal is output from pin 8 and input through a band rejection filter to the same video switch.
R103
27k Q101
C104
0.1uF
C101
2SC1623-T1-L5L6
47uF
R105
CL101 6.3V
100
FL101
R111
R101 R104 1k
5 4 3 6
22k 10k
5 4 O1 I1
2 7
IN LPF OUT
FG1 G1 G2 G3 1 FG2
13 12 10 9 1 14
R110
R114
1k 1k
(3) Composite sync signal separation circuit
A composite sync signal (CSYNC) is separated by IC201.
The composite sync signal of the Y signal input to pin 6 of IC201 is separated by IC201, and the Y
signal is output from pin 3. The output signal at pin 3 is positive-synchronous. Therefore, the output
signal is inverted by Q201 so that it is negative-synchronous.
OEP-3 V1 (UC)
R118
Q105
2.2k
2SC1623-T1-L5L6
C109
22uF
Q103 6.3V
MC141627FT
1 4
XN1501-TX
2 5
D102
1SS123-T1
3
C107
R123
4pF
1k C112
0.1uF
R117 R120 R121 R125
1.5k 1k 390 1.5k C110
22uF
6.3V
R126
10k
Q106
DTC124EKA-T146
C115
10uF
16V
Fig. 1-2 Y/C Separation Block
007-K4 DEC_Y
007-K3 DLYD_SYNC
007-K4 DEC_C
R201
1k
CL201
010-B2 *EXT_CSYNC
Q201
2SC1623-T1-L5L6
Fig. 1-3 Composite Sync Signal Separation Circuit
C127
C125
47uF
0.1uF
6.3V
C130
47uF
6.3V
IC101
C128
0.1uF
A_GND
C114
22uF
6.3V
15 6
VIN YOUT
C117
0.001uF
45 8
FSC COUT
20
CLK_AD
33
D7
42 34
VH D6
41 35
BYPASS D5
46 36
N/M D4
47 37
PAL/NTSC D3
48 38
COMB/BPF D2
39
D1
21 40
MODE0 D0
22
MODE1
23 25
TE0 C7
24 26
TE1 C6
27
C118
C5
0.1uF
13 28
RTP C4
14 29
C119
RBT C3
0.1uF
30
C120
C2
0.1uF
9 31
REF_DA C1
32
R131 C0
10k
10
IBIAS
16
CLOUT
R132
4 17
47
FILIN CLC
1
PCO
3
BIAS
R133
R128
10k
33k
R129
100
DEC_Y DEC_C D_SYNC
TP201 TP202 TP205
IC201
R212
BA7046F 330
7
C204
1uF
8 VCC 6
R202
PHCOMP VIN
10k
3
SYNCOUT
2 1
HDOUT HOSC
R209
470k
4
R206 C205
VDOUT
100k 0.001uF
GND
5
C203
C202
0.1uF 22uF
6.3V
A+5V
C135
L103 0.1uF
1uH
Q107
2SC1623-T1-L5L6
C137
47uF
6.3V
FL102
R140
5 4 3 6
1k
5 4 O1 I1
2
IN LPF
FG1 G1 G2 G3 1
13 12 10 9 1
C138
R138
47uF
6.3V 2.2k
C136
0.1uF
A-5V
Q108
2SC1623-T1-L5L6
FL103
R141
5 4 3 6
1k
5 4 O1 I1
2
IN LPF
FG1 G1 G2 G3 1
13 12 10 9 1
R139
2.2k
C132
R137
10uF
10k
16V
C131
0.022uF
R134
150k
Q111
2SC1623-T1-L5L6
R150
1k
R152
33
Q109
XN4501-TW
1 4
7 2 5
C145
OUT
0.1uF
FG2 R144
33
3 6
14
R148
470
R154 R156
1.8k 2.2k
R146
2.2k
R142
1k
C146
0.1uF
Q112
2SC1623-T1-L5L6
R151
560
R153
33
Q110
XN4501-TW
1 4
7 2 5
C147
OUT
0.1uF
FG2
R145
3 6
33 CL109
14
R149
560
R155 R157
1.8k 2.2k
R147
2.2k
R143
1k
C148
0.1uF
4-19