10
WM-FX277
SECTION 5
DIAGRAMS
Pin No.
Pin name
I/O
Descliption
1
XOUT
O
Crystal oscillator output (75kHz).
2
TEST2
–
Not used (Ground).
3
PA3
I
Key input.
4
PA2
I
Key input.
5
PA1
I
Key input.
6
PA0
I
Key input.
7
PB3
O
Key output.
8
PB2
O
Key output.
9
PB1
O
Key output.
10
LOCAL/DX
–
Not used (OPEN).
11
HOLD
I
HOLD switch input. “H”: ON, “L”: OFF
12
LOCAL SW
–
Not used (OPEN).
13
TV (H)
–
Not used (OPEN).
14
BAND
O
Band select signal output.
15
SD
I
Tuning signal detect input.
16
COMP
–
Not used (OPEN)
17
N/R SW
–
Not used (OPEN)
18
BACK UP
I
Back up voltage input.
19
AMP ON
O
Power ON/OFF signal output.
20
BEEP
O
Beep signal output.
21
BATT CHECK
I
Back up cancel input.
22
BATT REF
I
A/D reference voltage input.
23
––––––––––
–
Not used (Ground).
24
VSS
–
Ground terminal.
25
RADIO ON
O
Radio ON signal output.
26
MEGA BASS
O
MEGA BASS ON signal output.
27
MUTE
O
Mute ON signal output.
28
TAPE
I
Tape ON input.
29
PRE CTL
O
Preamplifier control output.
30
MOTOR CTL
O
Motor control output.
31
ID
I
Destination select input.
32-44
S1-13
O
LCD segment output.
45-48
COM1-4
O
LCD common output.
49-52
DBR1-4
–
LCD power supply.
53
RESET
I
Reset input (Fixed “H”).
54
TU VCC
–
Not used (OPEN).
55
VDD
–
Power supply.
56
FM IN
I
FM osc frequency input.
57
AM IN
I
AM osc frequency input.
58
VSS
–
Ground terminal.
59
E.O
O
Error (PWM) signal output.
60
LPF IN
I
LPF input.
61
LPF OUT
O
LPF output.
62
LPF GND
–
Ground terminal.
63
TEST 1
–
Not used (Ground).
64
X IN
I
Crystal oscillator input (75kHz).
5-1. EXPLANATION OF IC TERMINALS
IC702 LC72348W-9A36 SYSTEM CONTROL
