Icom PMR446 - System Block Diagrams; RF Unit Block Diagram; Main Unit Block Diagram

SECTION 10 BLOCK DIAGRAM
10 - 1
DS1
LN1371G
CTCIN
D/A
REMIN
PTT2
MICSW
MMUT
RMUT
AFON
RXV
TXV
POWER
LCD
DS2: LD-BU10503J
VOLT
SENS
RESET
IC5: S-80928ANMP
X2
CDBCA450CX24
FI3:CFWM450G
CERAMIC
BPF
FMDET S OUT
IF
AMP
NOISE
DET
IC2
TA31136FN
Q13: 2SC4081
Q14: 2SA1586
D8 : 1SS355
D9 : 1SS355
Q6: 2SC5108
D4, D5: 1SV284
X1
CR-669
(21.25 MHz)
2nd.Lo: 21.25 MHz
2nd MIX
IC1
µPD3140GS
UNLOCK
DATA/UNLK, CK, STB
Q1: 2SC4215
FI2: FL-297
Q7
2SC5108
R50
MOD LEVEL SET
VCO
BUFF
LO
SW
D1: MA77
D2: MA77
PWR
AMP
DRIVE
AMP
PRE
DRIVE
D7: MA2S077
D101: MA2S077
D102: MA2S077
POWER SET
R206
IC3: AT24C02N
EEP
ROM
X1
CR-627
(5.8368 MHz)
POWER
MODE
UP
DOWN
PTT
S1
CPU
IC1
µPD753036GK
AF
VOL
TXMOD
Q7
2SC4081
TONE
LPF
TONE
LPF
Q12
2SC4081
MODSW
Q1
DTA144EU
LPF IDC
+3V
IC2A
NJM2100M
Q6
2SK1829
MIC
MUTE
IC2B
NJM2100M
Q23
2SJ144
R58
AF VOL
VOL
MUTE
MC1
KUC3523
PTT
SENSE
MIC
SW
MIC
R+3
CURRENT
AMP
R+3 T+3
+3V
CURRENT
AMP
Q25: UMZ2N
D4: 1SS355
+3V to LOGIC
+3
REG
IC6
S-81230SG
Q18
2SA1586
Q27 : 2SC4081
Q28 : 2SB798
Q101: UMZ1N
D5: 1SS355
T+3
CURRENT
AMP
D2: 1SS355
PROTECTOR
Q29: DTC114EU
Q2: UN9214
Q3: DTA123JUA
AF
MUTE
BATT
BATTERY
J3
COMON LINE
TX LINE
RX LINE
DATA BUS LINE
J1
SP1
AF
AMP
IC9
NJM2070M
Q5 : 2SA1362
Q10: 2SC4081
Q11: 2SC4213
Q2
3SK284
Q3:2SC5194
RF
AMP
ANT
SW
HPF LPF
ANT
CHASSIS UNT
Q15: 2SC4081
Q16: 2SC4081
VCO
REG
PLL
IC
AF FIL
1st IF: 21.7 MHz
1st.LO
RX Frequency 21.700 MHz
TX/RX: Frequency
446.00625 – 446.09375 MHz
1st MIX
FI1: NSVS647
SHIFT
Q12
2SC5006
Q202: XRF9482
Q201: 2SC3356
D103: MA2S728
Q8: 2SC4228
SQL SENS PSC
LOOP
FIL
IF
AMP
XTAL
BPF
BPF
CHASSIS UNIT
RF UNIT
MAIN UNIT
Q203
2SC5108
BUFF
RX-LO
SHUNT SW
R+3
Q14
DTA114EU
LED
DRV
SP JACK
MIC JACK