JVC KD-LH3150 Service Manual page 34

KD-LH3150, KD-LH3100
QQ
3 7 63 1515 0
4.9 HD74HCT126T-X (IC503) : Buffer
• Pin layout
1C
1
1A
2
1Y
3
2C
4
2A
5
2Y
6
GND
7
• Block diagram
TE
L 13942296513
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1-34 (No.49838)
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14
Vcc
13
4C
12
4A
11
4Y
10
3C
9
3A
8
3Y
1A
1C
2A
2C
3A
3C
4A
4C
x ao
y
. i
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8
• Pin function
Input Output
C A Y
L X Z
H L L
H H H
H : High level
L : Low level
X : Irrelevant
Z : Off (Hhigh-impedance)state of a 3-stage output
Q Q
3 6 7 1 3
u163
.
2 9 9 4 2 8
1Y
1 5 0 5 8 2 9 9 4
2Y
3Y
4Y
m
co
9 9
2 8 9 9