14
WM-FS421
6-5. IC PIN FUNCTION DESCRIPTION
• MAIN BOARD
IC702 (DTC) LC72348W-9906
Pin No.
1
2
3-6
7-9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30-44
45-48
49-52
53
54
55
56
57
58
59
60
61
62
63
64
Description
Crystal output
GND
Key input
Key output
AVLS output
MOTOR control
NOMAL/METAL(DX/LOCAL) select output
Not used
Band output
SD input
COMP input
TAPE FWD/REV input switch
Backup input
AMP-ON output
Beep output
Backup input during halt
POWER CHECK input
HOLD Key input
GND
RADIO ON/OFF control
MEGA BASS ON/OFF control
Mute output
TAPE input
PREAMP control
segment output
Common output
LCD power supply
RESET input
IF input
Positive polarity
Input to FM system
Input to AM system
GND
Error output
LPF input
LPF output
GND
GND
Input to crystal
Pin Name
XOUT
TEST2
PA0-PA3
PB1-PB3
AVLS
MOTOR CTL
LOCAL/DX/NOR/METAL
E/CA
BAND
SD
COMP
N/R SW
BACK UP
AMP-ON
BEEP
BATT CHECK
BATT REF
HOLD
VSS
RADIO ON
MEGA BASS
MUTE
TAPE
PRE CTL
S1-S15
COM1-COM4
DBR1-DBR4
RESET
TU VCC
VDD
FM IN
AM IN
VSS
E.O
LPF IN
LPF OUT
LPF GND
TEST1
XIN
I/O
O
—
I
O
O
O
O
I
O
I
I
I
I
O
O
I
I
I
—
O
O
O
I
O
O
O
—
I
I
—
I
I
—
O
I
O
—
—
I
