Icom IC-F521 - Section 10: Block Diagram

SECTION 10 BLOCK DIAGRAM
DIMDIM
HORNOHORN
DISC DET
PTT
IN
ACC
EPTT
SW
LINE
MOD
VCC
PWR
SW
POWER
HV
19.66 MHz
HN58X24128FPI
CR
- 520
X4
MA77
D27
EEPROM
SW
IC23
FRONT UNIT
AF VR
PWR
AFVI
POSW
ESDA
ESCL
KR0
- KR2
KEY MATRIX
OPC - 453
W2
IC24
S - 80942CNMC-G9C
CSFT
RES
RESET
SHIFT
DTC144EU
Q24
2SJ377
Q23
CPU5
AN78L05M
IC10
Q38
REM
DTC144EU
CENC2
TENC
DUSE
SW
FIL
IC9 TA7808F
Q29 DTC144EU
8V
T8V
R8V
TXC
TMUT
+8
REG
Q25 2SD1664
Q26 2SD1664
REG
T8
REG
R8
E
D
F
2SJ144
Q31
SIG
SIGOUT
J6
PROG
IO
MD1
RES
XRTS
XCTS
IGSW
PGO1, 2
PGI1
- 3
XRXD
XTXD
USB
232C
MAP27
FLAH
J9
NRXD
J8
NTXD
GPS
DTC144EU
Q42
DTC144EU⋅ 4
Q46, Q47
Q44, Q45
SIGOUT
AFONO
REM
BEPO
MCOT
MCIN
PTTO
PTTI
SCK
BUSY
OPV3 (AFCL)
OPV2 (AMSK)
OPV1 (APST)
J1
OPT3
OPT2
OPT1
CCS
MMUT
RMUT
SO
SI
CIRQ
UNIT
OPTION
AFCL
ARDT
ARTM
SO
APST
ADIN
ATRD
SO
SCK
DAST
SCK
AMSK
Q30 DTC144EU
5V
DDSO
DDAC
DDST
DEC
LPF
LPF
+5
REG
DTMF
2SC4116
(J1)
3.58 MHz
CR - 563
IC14
X3
TC35453F
Q28 XP6501
Q27 2SB1132
MCIN
COMPANDER
REG
+5
TONE
SENC
Q37
2SC4116
Q36
(J1)
MCOT
2SC4116
CENC1
CENC0
IC20
HD64F2268TF
DSDA
SCK
CPU
LINH, LCS, LCK, LSO
FSW
HORN
LC75824W
COM1 - 4
SEG1
- 40
KS0 - KS2
IC1
LCD DRIVER
Q2, Q3 DTC144EU⋅ 2
DIM2
DIM1
8V
DS7
- DS11
DS1
- DS6
8V
Q1, Q4 DTA144EU⋅ 2
SML
- 311YT⋅ 6
D4
- D6
MA2S111⋅ 3
SML
- 311YT⋅ 5
SW
LED
AFO
MIC
MIC JACK
PTT
J1
CLO CLID1 - D3 RB706F-40⋅ 3
C
PTTO (J1)
PTTI (J1)
DS12
LCD
MICI
D35 MA2S111
NJM12902V
IC21
D31 DAN202K
M62334FP
IC7
TONE
CTCS
SIG
TC4W53FU
IC15
PM/FM
AMP
D/A
A
DER
EXPAN
Q21
DEMOD
MSK
HPF
AMP
AMP
LPF
AMP
LPF
MOD
MSK
NJM12902V
CTCS
MICO
IC6
IC21
HPF
AMP LPF
HPF
AMP
LPF
HPF
BUFF
LIMIT
AMP
BPF
M62364FP
SSOR
COMPRE
D/A
REF
DUSE
TENC
MICI
B
DISC
BAL
MOD
TC4S66F
IC22
XP1214
Q35
SW
FIL
CDEC
NJM12904V
IC5
NJM12902V
IC21
SDEC
SW
FIL
RATION
RESTO
-
450 kHz
NOIS
CDBC450CX24
X1
Q6 DTA144EU
Q5 2SC4116
NWC
SW
W/N
DET
ALFYM450F=K [N/W]
CFWM450G [N/M]
FI2
RSSI
SQIN
SQL AMP
DETECTOR
2SC4213
Q20
FSW
SW
FIL
TONE
BEEPO
BEEP
NJM12902V
IC21
W/N
DTC144EU
Q22
MIXER
SW
NWC
T4
M62364FP
IC6
Q40 DTC144EU
Q39 DTC363EK
TA75S01F
IC18
AFONO
AFON
Q2
3SK293
T2T3
HG
LA4425A
IC8
T1
J4
SP -
SP+
INT SP
MA2S728
D32
TMUT
SW
MUTE
DET
PWR
D8 HVC350B
TC75S50F
IC2
T4
D4 HVC350B
Q1
2SK1829
RSSI
D10 HVC350B D9 HVC350B
RX LO
182.35
- 220.35 MHz
46.35 MHz
Q3
3SK272
Q12
Q4
FL
- 335
FI1
2SC4215
2SC4226
Q14
2SC5107
PUMP
CHARGE
FILTER
LOOP
1SV245
HVC350B⋅ 4
D17, D53
- D55
D18
IC1
TA31136FN (D)
TX VCO
MOD
LPF
AMP
BUFF
BUFF BUFF
ATT
BPF
BPF
D/A
AMP
BPF
PWR
AMP
BPF
AF
MUTE
AF
AMP
TX/RX
SW
YGR
AMP
DRIVE
AMP
LPF
GATE
CTRL
RF
AMP
ATT
LPF
LPF
LPF
ANT
SW
APC
AMP
XTAL
BPF
CERAMIC
BPF
IF AMP
SECOND MIXER
FSW2
DET
LPF
LPF
REF
AMP
x3
UNLK
SCK
SO
PLST
Q34
2SC4116
45.9 MHz
15.3 MHz
FRACTIONAL N
MOD
BPF
TC75S51F
IC11
BAL
TB31256FL Q55 XP2501
Q54 XP2401
Q51 2SA1576
Q50 2SC4081
CR
- 664A
X2 IC4
PLL
IC
LVIN
Q53 2SC4116
Q52 2SC4116
ACTIVE
HVC350B⋅ 4
D16, D50
- D52
8V2SK880
Q18
2SC4116
Q17
RIPPLE
FIL
BUFF
RX VCO
TXC
Q11
Q16
Q10
2SC4226
Q13
XP1214Q15
DTC144EU
2SC5107 2SC5107
SW
VCO
D14, D15
MA77⋅ 2 2SC5107
Q9
2SC3585
MAIN UNIT
1SV252
D72
RA30H1317M-21 [25W]
RA60H1317M-21 [50W]
IC3
Q8
1SS375⋅ 2
D2 UM9401F [25W]
D6 MA77
D5 UM9401F
D1, D11
136 - 174 MHz
DATA BUS LINE
CONTROL LINE
RX LINE
VOLTAGE LINE
TX LINE
COMMON LINE
Explanatory notes
DN( , )
UP( , )
P0
- P4
10 - 1