Yamaha CD-S2000 Service Manual page 42

A B C
CD-S2000
DIGITAL 2/3
1
Q Q
3
2
DIGITAL (2)
3
CB800
4
Page 43 H4
to DIGITAL (5)_CB902
5
T E
L 1 3
6
7
8
9
w w w
10
# All voltages are measured with a 10MΩ/V DC electronic voltmeter.
# Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
# Schematic diagram is subject to change without notice.
42
D E F
7 1 5
6 3
0.6 0.8
5.3
30.3
0.6
0.8
9 4 2 2 9 6 5 1 3
Key detection for AD port
Key INPUT (A/D) pull-up resistance 10 k-ohms
Ohm
V
KEY0 (93 pin)
KEY1 (94 pin)
KEY2 (95 pin)
x a o
. i
G H
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1 5
0
30.3 5.0
0
W801
Q Q
3 7
SAN-PH
+ 820 + 3.3 k + 12.0 k
0 – 0.3 0.6 – 1.0 1.6 – 2.0
STOP PAUSE OPEN/CLOSE
PLAY SEARCH+/SKIP+ SEARCH-/SKIP-
PURE DIRECT SA-CD/CD –
IC802: TC7SH08F
2-input AND gate
u 1 6 3
y
IN B 1 5
V CC
IN A
2
GND OUT Y
3 4
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I J K
2 4
8 9
CB802
5.0 5.0
6 3 1 5 1 5 3.3 0 3.6 8
3.3
0 0
0 0
3.3
IC802
3.3
3.3
3.3
0
DIGITAL (3)
m
c o
.
A B Y
L L L
L H L
H L L
H H H
L M N
2
9 8 9 9
W803A W803B
1.9
0.1
0.1
9 2 4 9 8 2 9 9
0
DIGITAL (4)