Icom ID-31A Service Manual page 34

SECTION 10. BLOCK DIAGRAM
3VS
MAIN UNIT
EXTMIC
J5
MC1
3VS
MIC PTT GAIN
SW CONT SW
Q21 Q20 Q18
MIC1 MIC2
TEMP 3VS
TEMP
DETECT
CLONE
CPU3
CLIN
CLONE
CLOUT
IC8,Q11,Q13
D21,D23
REMOTE
RX232
RS-
TX232
232C
J4
5VS
DIM
LCD
LIGHT
Q23,Q24,DS1
DS3,D32,D33
KEY
LIGHT
BACK
LIGIT
G_VDD Q23,DS2,DS4,DS5,DS6
CHASSIS UNIT
IC21
G_RXD LEVEL
CONV
GPS
GPS
ANT
IC1
G_TXD,G_RES,G_HIB
GPSA3V
GPS ANT CLK CLSFT
EEPROM
SHIFT
REG
IC3 D18
3VS
12.288MHz
X2
SD_TXD
SD_RXD
SD_SCK
SD_CS
SD_SENC
microSD
J3
3VS
3VS
IC16
MMUTE
MIC
SW
PS3
AMP
IC19B
ALC
MMUTE PLAY AMP
IC14
3VS
VOX
AMP
IC19A,D26
IC13B
Q15
Q17
DCSFT
SHIFT
Q19
DSP_REQ,DSP_PD,DSP_SO,DSP_SI
DSP_STB,DSP_DEMP,DSP_REMP
DSP_CK,DSP_AFC1,DSP_AFC2,DSP_REST
BEEP
LPF
CPU
IC5
LCDDT ESIO KR0-2
LCDCK ESK KS0-3
LCDRS CPU3V
LCDRES
LCDCS
KEY
BATT CPU3V
LCD EEPROM MATRIX RESET
DET
BOARD
D1-D12 IC22
IC7 Q25
S1-S11
BTDET
10 - 1
ATT
3VS
BUFF
IC15
DMI
DMO DMOD
LPF
3VS IC12B LINEAR
RTONE
CODEC
IC12A
PWDAN
LPF PWADN
BCLKX1
BFSX1
BDX1
BDR1
DDET
12.288 MHz
CLK
AMP
X3
IC17
DSP
DTCS
DSP
FLASH
BCLKX0
FCS,BDX0
IC18 IC20
Q7
CTCOUT
LPF
3VS
AMP
IC13A
DADATA,DACK,DALD
UNLK
RSSI
NOISE
VCO_SEL,PCON,R3C
CHGC,CHGH
INTPTT
CPU3
VCC
CPU3V
REG
IC9,D20
DAFS,FMMUTE
WN,REMOTE
DCIN
PLLDATA,PLLCK,PPS,PLLSTB
DCIN
REG
HV
T3C,TXMUTE
Q12,D22,D24
MIC1,MIC2,MMUTE,PLAY
VIN
DTCS
LV,TEMP,TTEMP,DCIN,VIN
BTVIN,BTDETO,BTDET
PS3
PS3 3VS
REG
TXI-V
Q10
REALTIME
CLOCK IC
PS3C
RTC_SDA
RTC_SCL
IC4
RTC_IRO G_VDD
GPS
D16
5VS
BATTERY REG
CVDD_1.35V
BT1
IC10
X1
32.768kHz
DSP
DVDD_3.3V
REG
IC11
LOGIC UNIT
BTL5V
J4
VO+
AF
AMP
VO-
IC2
AFON
CLONE
SP1
CHASSIS UNIT
3VS 3VS D_AS FMMUTE
FM
MODE MOD
HPF BPF LPF
SW
IC8,Q22
IC9A IC9D
DV
LEVEL
DACK
CONV
DALD
IC11
DADATA
Q33,Q34,Q35
DAFO
AF
3VS
BEEP
FILTER
IC9B,C Q23
DAFS
FMMUTE
CTCIN
DDET
3VS
S2
MAIN UNIT
3VS
+5V
BUFF +5V
IC16
BPF1,BPF2
BPF3,SQLOUT
VCOMOD VCOMOD
D/A
REFMOD REFMOD
REFCON REFCON
SQLIN
3VS
MODE
SW
IC8
LPF
R3
TONE
FILTER
Q31
DET
LPF
UNLK
RSSI
NOISE