Block Diagram - Icom IC-A25N Service Manual

SECTION 8

BLOCK DIAGRAM

VORON
VORDET
NARROW2 R5S
W5V
5V
N5V
SW
VORON
V5V
D62,D91,D93,D94,
Q54,Q68,Q243
ANL
ANLC ANL
SW
Q21 D18
WXC +5V
AM/FM
SW
DETMUTE
IC2
AFDET
VCC SBATT VCC CPU3V VCC 5VL
EXTERNAL
CPU3V 5VL
CHARGE
REG REG
DETECT
IC41 IC34,D35 IC40,D34
PCON
VORB VOR3.3V VORB VOR3.3V
LIMIT FM PHASE
BUFF BPF
AMP DET SHIFT
IC12b
IC12c IC11a IC11b,D16 IC13a
AMP
Q13,D17
VORB
BIAS
IC12a
VOR3.3V
VOR
LCD
CTRL
Q15 DS5
VORON
5VL
GPSC
REG
IC31
GPS
ANT
GPS3V
GPS
MODULE
IC17
SQL key CPU
IC27
PTT key
LIGHT key
VOL
DIAL
Sheet key
INITIAL LCD
CLOCK
MATRIX Backlight
D1,D2 DS2~DS4 X1,D18
Q31~Q34
R5S VORON R5S W5V
R5S
D24
VOR AGC
VOR FIL
SW AMP SW SW
IC25
IC241 IC24,Q68
N5V
AM_DET
D25
RF_AGC
AGC FIL
SW SW
Q53
V5V
D89
FIL
SW
X1
R5S
IC1
FM AGC AM
DET
AMP DET
NOISE
AMP
IC22,D40 NDET
NOISE
2LOC
LOGIC/LOGIC-1
FC
VOR3.3V VORB
BPF
LVIN
VORB
IC12d
LPF
IC13b
MAIN/MAIN-1
Explanatory notes
COMMON
DATA
RX
TX
PCK,PDATA,PSTB,UNLK
ECK,EDATA
BATTX
POWSW
BATT
RESET EEPROM DATA I/O
BATRX
IC36,Q24,Q25,D48
IC38 IC37
W5V
D11
FI2
CERAMIC FIL
BPF
SW
0.450 MHz
N5V W5V V5V
FI4 D12
CERAMIC
FIL FIL
BPF SW SW
D57
0.450 MHz
V5V R5S N5V
FI5 D90
CERAMIC
FIL IF FIL
BPF SW AMP SW
Q13
0.450 MHz D55
D86
GAIN
Adj.
IF-IC
NOISE IF
S OUT
DET AMP
+3V VCO5
×3
Q62
BUFF
REF
OSC Q29
+5V
RX-VCO VCO5
X203: 15.3 MHz
Q216,IC219
+3V
Q58,
PLL D38,D48
LOOP
BUFF
IC FIL
TX-VCO Q60
IC203
RX VCO: 154.350~209.625 MHz
REF
OSC TX VCO: 118.000~136.9916 MHz
Q59,D45,D46
+5V
X2: 12.8 MHz
VCO5
+5V
Q57,Q217
from PLL-IC
GPIO
VCO RIPPLE
LV
SW FIL
DET
from PLL-IC
SHIFT
GPIO
Q215
AFDET
BUFF
IC222b
LPF +5V
IC223a~IC226a
MIC_SW BUFF
IC222a
IC228
LPF
IC223b~IC226b
SHIFT
RESISTOR
IC5
+3V
NARROW2
NARROW2
SW
Q236
JACKDET
SCK,SDATA
CLIN
CLONE CLONE DA1STB
CLOUT I/O
IC35,Q22,Q23,D47
(include MAIN/MAIN-1 D59)
DCIN
CPU3V
DCC
EXT-DC
SENS.
Q3,D7,D8
VIN
CHGC
8-1
W5V V5V
FI1
XTAL
FIL
BPF SW
46.35 MHz D56
N5V
R5S
FI3 D15,D16
Q12
XTAL FIL RF
BPF
BPF SW AMP
Q11
46.35 MHz
D58
(from IC216)
LO FREQ.
ATT Rx: 154.350~183.3416 MHz
208.000~209.625 MHz
TXV
PRE DRIVE
ATT
LO-SW
DRIVE AMP
Q4
D6,D17
VCO5
Q28
BUFF
Q33
VOX
VOX DET
IC232b,D74
ALC5V
MOD90O MOD90I
ALC
D/A EVOL
AMP
IC215
IC220 IC229
+5V ALC5V VCC AF5V
ALC AF AMP
CONTROL REG
+5V
Q52 Q35,Q36
D/A
ALCC AFC
IC216
+5V R5S VCC TXV
BUFF
IC233
R5S TXV
REG REG
Q20,Q66 Q7,Q8
R5C TXC
VCC +5V +3V
EXT-V
+5V
DETECT
+5V +3V
D/A REG REG D30
IC240,D78 IC238,D83
IC220
PCON
BEEP PWSW
POW_SW
DETO
JACK
DETECT
Q52
VIN
ANT
Tx: 118.000~136.9916 MHz
Rx: 108.000~136.9916 MHz
161.650~163.275 MHz
D13,D50
ANT
BPF ATT LPF
SW
D29 D1,D8,D14,D44
(from IC216)
PA TEMP
+3V PATMP
DETECT
VCC
VCC
PWR
LPF
AMP
Q3 Q2
TXC
APC POWER
AMP DET
IC14
D2~D5,D49,D51
MOD
POW RFDETV
(from IC216)
+3V
EXTREGC VCC
D23,D27,Q25,Q26
EXT PTT EXT-MIC
DETECT REG
[MIC]
J2
Q50,D36
+5V
IC231
MMUTE MC1
MIC_SW ECM
BUFF
BTMICSW
IC232a
LOGIC/LOGIC-1
MIC
BTMIC
CONTROL
Bluetooth
LOW_BAT
ANT DET
Q226,D71
IC39
H_PTT,BT_DEMP
EMBI
Bluetooth
CPU_DEMP,BT_SW,BTTEST BT REG
UNIT
BTRXD,BTTXD IC1 IC30,
D46
BT_SW 5VL
BUFF
IC32
AF5V INT SP
BTAF
PWR
AMP
IC221
SHUTDOWN
MUTE
VOL
SW
VOLO
SPMUTE
IC229 Q245,Q246 Q232,Q233
[SP]
J5
VCC HV
DC SW
D67,D68,Q213 [DC 11V]
J1
DC SW
DC SW
Q212
IC234,IC235,IC239,
Q223,Q224 BATT
D80~D82,D87,D88,
CHARGE Q220,Q234,Q235,
Q238~Q240
CHGIH
D66,Q218
PCON
BATT-V
DETECT
D31
7.2V
SBATT2
To LOGIC/ BATTERY PACK
LOGIC-1