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Yamaha A-S2100 Service Manual page 49

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IC505:
TC74HC4051AFEL (FUNCTION (1) P.C.B.)
8-channel analog multiplexer/demultiplexer
A
B
C
INH
Pin
Function Name
Port Name
I/O
No.
(P.C.B.)
1
4
I_LRBAL
I
L/R balance adjustment
2
6
I_BAS
I
BASS EQ
3
COM
EXAD
O
COM output terminal
4
7
I_TRE
I
Treble EQ
5
5
I_VOL
I
Volume operation
6
INH
MG
7
VEE
MG
8
GND
MG
9
C
4051C
I
Channel select
10 B
4051B
I
Channel select
11 A
4051A
I
Channel select
12 3
I_CNTR
I
Center value of BAS/TRE/BAL
13 0
I_ISEL
I+
Input selector rotary switch
14 1
I_SPAB
I+
SP select rotary switch OFF/A/B/A+B
15 2
I_HPTRIM
I+
Headphone trim rotary switch (-6/0/6/12)
16 VCC
+5STBY
COM
OUT
C IN
0
1
2
4 1
16
Vcc
3
6 2
15
2
COM 3
14
1
4
7 4
13
0
5
5 5
12
3
INH 6
11
A
6
V
EE
7
10
B
OUT
C IN
7
GND 8
9
C
Detail of Function
A-S2100
49

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