JVC KS-FX490 Service Manual page 25

4.3 HD74HC126FP-X (IC801) : Buffer
• Pin layout
1
1C
2
1A
3
1Y
4
2C
5
2A
2Y 6
7
GND
• Block diagram
Note:
CL includes probe and jig capacitance
4.4 LB1641 (IC402) : DC Motor driver
• Pin layout
1 2 3 4
GND OUT1 P1
VZ
4.5 RPM6938-SV4 (IC602) : Remote control receiver
• Block diagram
14
VCC
13
4C
12
4A
11
4Y
10
3C
9 3A
8
3Y
Vcc Vcc
1A
2A
3A
Input
4A
1C
2C
3C
4C
5 6 7 8 9 10
IN2 VCC1 VCC2 P2 OUT2
IN1
AMP
I/V
conversion
for
PD
trimming circuit
magnetic shield
• Pin function
Input
C A
L X
H L
H H
Note:
H:High level
L:Low level
X:Irrelevant
Z:Off(High-impedance)
State a 3-state input
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
• Pin function
Input
IN1 IN2
0 0
1 0
0 1
1 1
Vcc
22k
AGC
ohm
Comp
BPF
Detector
Output
Y
Z
H
L
S1
1k
Output Mode
OUT1 OUT2
0 0 Brake
1 0 CLOCKWISE
0 1 COUNTER-CLOCKWISE
0 0 Brake
VDD
3
OUT
1
GND
2
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