JVC KS-FX725R service manual HD74HC126FP-X IC751 Buffer, LB1641 IC402 DC motor driver

KS-FX725R

HD74HC126FP-X (IC751) : Buffer

1.Terminal layout

1

2

3

4

5

6

7

14

13

12

11

10

9

8

3.Pin function

Input		Outout
C	A	Y
L	X	Z
H	L	H
H	H	L

2.Block diagram Vcc

Input

See Function Table

Vcc

1A

2A 1Y

3A

4A 2Y

1C

2C

3C 2Y

4C

3Y

4Y

Output

Output

Output

Output

1k

S1

CL1k

Sample as Load Circuit 1

Sample as Load Circuit 1

Sample as Load Circuit 1

LB1641 (IC402) : DC motor driver

1. Pin layout

1 2 3

GND OUT1 P1

4

VZ

5

IN1

6 7 8 9

IN2 VCC1 VCC2 P2

10

OUT2

2. Pin function

	Input		Output		Mode
IN1		IN2	OUT1	OUT2
0		0	0	0	Brake
1		0	1	0	CLOCKWISE
0		1	0	1	COUNTER-CLOCKWISE
1		1	0	0	Brake

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