JVC KD-SX841R Service Manual page 29

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4.3 HD74HC126FP-X (IC801) : Buffer 3 7 63 1515 0
• Pin layout
1C
1A
1Y
2C
2A
2Y
GND
• Block diagram
TE
L 13942296513
Note:
CL includes probe and jig capacitance
4.4 IC-PST600M/G/-W (IC702) : System reset
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1 14
VCC
2 13
4C
3 12
4A
4 11
4Y
5 10
3C
6 9
3A
7 8 3Y
Vcc Vcc
1A
2A
3A
Input
4A
1C
2C
3C
4C
Co1
x ao
y
i
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8
• 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
Q Q
3 6 7 1 3
Output
2Y
Sample as Load Circuit 1
Output
3Y
Sample as Load Circuit 1
Output
4Y
Sample as Load Circuit 1
OP1
u163
.
2 9 9 4 2 8
Output
Y
Z
H
L
S1
1k
1 5 0 5 8 2 9 9 4
1
IN
3
Vout
2
GND
m
co
KD-SX841R
9 9
2 8 9 9
(No.49790)1-29