7-2
IFB-12/12A
IFB-12 (OLD) (2/3) BOARD
IC2 GS4881-CKA
1
4
5
6
7
8
3
2
Q
Q
S
R
YA
YB
Y
+
+
+
OSC
+5V
O
DEFAULT
Y2
Y1
Y1
Y2
Vcc
CAPACITOR
CHARGE
CURRENT
CLK
I O
CK
CLK
O
REC
COMPOSITE
SYNC
VIDEO
INPUT
VERTICAL
SYNC
GND
BURST GATE/
BACK PORCH
CLAMP
GND
ODD/EVEN
FIELD INDEX
SUPPLY
VOLTAGE
+
–
+
–
+
–
+
–
+
–
+
–
IFB-12 (OLD) (2/3) BOARD
IC3 SN75157PS
IFB-12 (OLD) (3/3) BOARD
IC10, 11, 12 MPC100AU
IFB-12 (OLD) (2/3) BOARD
IC5 SN75453BPS
8
7
6
5
1
2
3
4
NON INV IN1
OUT1
OUT2
GND
V
CC
INV IN2
NON INV IN2
INV IN2
1
2
3
4
8
7
6
5
1 A
1 B
1 Y
GND
V
CC
2 B
2 A
2 Y
1
2
3
4
5
6
7
14
13
12
11
10
9
8
IN 1
DB1
GND
IN 2
GND
IN 3
GND
IN 4
SEL 1
SEL 2
–V
CC
V OUT
+V
CC
SEL 3
SEL 4
DB2
DB3
DB4
