JVC KD-SH77R Service Manual page 28

KD-SH77R/KD-SH55R
HD74HC126FP-X (IC771) : Buffer
1.Terminal layout
1C
1
1A 2
1Y 3
4
2C
2A 5
6
2Y
7
GND
2.Block diagram
Vcc
Input
RPM6938-SV4 (IC561) : Remote sensor
1.Block diagram
I/V
conversion
PD
1-28
3Y
14
13 3A
12 3C
11
4Y
10 4A
9
4C
8
Vcc
Vcc
1A
2A
3A
4A
1C
2C
3C
4C
AMP
BPF
fo
trimming
circuit
magnetic shield
3.Pin function
Input Output
C A Y
L X Z
H L H
H H L
Note: H : High
L : Low
X : H and L
Z : H.L.X
1k
Output
1Y
CL
Output
2Y
Sample as Load Circuit 1
Output
3Y
Sample as Load Circuit 1
Output
4Y Sample as Load Circuit 1
Vcc
AGC
Comp
Detector
S1
1k
Vcc
22k
Rout
GND