Block Diagram - Icom IC-M2A Service Manual

SECTION 10

BLOCK DIAGRAM

BTYPE
GND
VOLIN
VOLO
GND
VR
HV
POWER VCC
VCC
VR
SP
EXP JACK
J250
SPO
AFOUT
Q250: UN911H
CLONE
PTT
MIC
PTT
CONT
GND
R253: 2.2 k
C254: 0.01
PRE
MIC
ENPHA
Q230: 2SB1132 Q
Q231: XP6501 AB
PTT
HV
AF
REG
AF
AMP
IC280: TA7368F
Q350: DTC144TU
D350: DA204U
BUFF
IC1: UPD3140GS
REF
X1: CR-726
D1: HVU17
(21.25 MHz)
PLL IC
FCON
2nd LO
21.25 MHz
DET
X170:
CDBCB450KCAY24
(450 kHz)
MODC
IC200D: NJM2902V
LPF
IC200A: NJM2902V
LIMIT
AMP
IC200B: NJM2902V
MIC
AMP
IC260: TC4W66F
ANALOG
SW
AFVS
R286: 10 k
Q280: 2SC4213 B
C285: 0.1
DE-
AF MUTE
ENPHA
SW
IVOLM
COMMON LINE
RX LINE
TX LINE
10 - 1
Q21, Q22: 2SC4226 R25
D22, D23: HVU350B
Q23: 2SC4215 O Q24: 2SC4215 O
D50, D51: MA77
VCO
LOOP TX/RX
BUFF
BUFF
FIL SW
R5V
MOD
MUTE
Q20: DTC144EUA
D20: MA2S077
D21: MA77
BUFF
Q25: 2SC4215 O
VCO
1st LO
FI150, FI151
IC170: TA31136FN (21.7 MHz)
IF
IF
IF DET IC BPF
AMP
Q150: 3SK272
Q151: 2SC2714 Y
RSSIV
BPF
NOISV
FI170
(450 kHz)
D/A
VCC
IC190: M62363FP-650C
Q223: DTC144EUA
Q224: XP6501 AB
Q225: 2SB1132 Q
5V
REG
5VS
SV
Q221: 2SA1588 GR
R5V
REG
R5VS
R5
Q220: 2SA1588 GR
V5V
REG
V5VS
V5
Q222: 2SA1588 GR
T5V
IC200C: NJM2902V
REG
T5VS
T5
LPF
BEPO
ATIS
BEEP
BTYPE
WXTV
PTT
CLOUT/CLIN
D52, D90: 1SV307
Q53: 2SK2973 Q54: 2SK2974
D91: 1SS375
ANT
PRE
PWR LPF
BUFF DRIVE
AMP SW
Q50: 2SC4226 R25
D80: 1SS375
IC50: NJM2125F C87: 2 P
APC HV PWR
I.SENS
CTRL DET
Q51: 2SC4081 R
BPF
Q52: XP6401
PCON
D92: MA77
D130: MA77
D93: MA728
RF
BPF
BPF
AMP
Q90: 2SC4226 R25
VCC
IC220: NJM2870F05
CPU5V
CPU
SV
IC341: S-80942ANMP-DD6
RESET
X360: CR-610
(7.9872 MHz)
CPU
IC360: HD6433844RA60H (FX-2497A)
R300–R315
ATIS1–8
D/A
EEPROM
IC340: HN58X2416TI
ANT
DS360: A0153A
L
C
D
Q240: XP1213 DS240–DS245
LED SW
LED
KEY