Yamaha CRX-E300 Service Manual page 34

CRX-E300
QQ
3 7 63 1515 0
IC202: TC74HC4051AF (OPERATION P.C.B.)
Analog Multiplexer/Demultiplexer
INHIBIT
6
A 11
B 10
C
9
GND
8
VEE
7
0
13
1
14
2
15
3
12
4
1
5
5
6
2
7
4
No. Name
1 4
2 6
3 COM
4 7
5 5
6 INHIBIT
7 VEE
8 GND
TE
L 13942296513
9 C
10 B
11 A
12 3
13 0
14 1
16 VCC
G
KEY INPUT (A-D) PULL UP RESISTOR 33k
Ω
0
V
0 — 0.556
KEY 0
STANDBY/ON
KEY 1 PRESET/BAND
KEY 2
DISPLAY
G
TUNER MARKET SELECT IN (IC202 1 pin) PULL UP RESISTOR 10k
www
Ω
0
V
0 — 0.556
R, K models
.
Market
(50k / 9k)
34
http://www.xiaoyu163.com
VCC
16
LEVEL BINARY TO 1-OF-8
CONVERTER DECODER WITH INHIBIT
SW
SW
SW
SW
Destination select input (Input)
Headphone detect IN
KEY 2 input
Expansion IN port 2 (TC74HC4051A) OUT intake IN
KEY 0 input
KEY 1 input
Ω
+6.8k +5.6k
— 1.111 — 1.667
PRESET/TUNING PRESET/TUNING OPEN/CLOSE
AUTO/MAN'L STOP
TIMER
MEMORY PLAY/PAUSE
TIME ADJ
2k 3.9k
x ao
y
— 1.111 — 1.667
R, K models A model
i
(100k / 10k)
http://www.xiaoyu163.com
8
COM
3
SW
SW
SW
SW
Function
Q Q
3 6 7 1 3
+8.2k
— 2.222
NO KEY
NO KEY
Ω
6.2k 10k
u163
— 2.222 — 2.778
B, G models U, C models
.
2 9 9 4 2 8
INPUT STATES
"ON" CHANNNEL
INHIBIT C B A
0 0 0 0 0
0 0 0 1 1
0 0 1 0 2
0 0 1 1 3
0 1 0 0 4
0 1 0 1 5
0 1 1 0 6
1
0 1 1 7
1 X X X NONE
[Pull Up → VREF at 10kΩ]
[0: SP, 1: HP]
1 5 0 5 8 2 9 9 4
[Pull Up → VREF at 10kΩ]
[Connected to pin No. 3 of 4051A]
[Pull Up → VREF at 10kΩ]
[Pull Up → VREF at 10kΩ]
m
16k
co
—3.333
J model
9 9
2 8 9 9