Ic Pin Function Description - Sony WM-FS421 Service Manual

WM-FS421

6-5. IC PIN FUNCTION DESCRIPTION

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