Block Diagram - Icom IC-M88 Service Manual

SECTION 10

BLOCK DIAGRAM

Common
Transmit
MAIN UNIT
Receive
Power supply
F281
1
FUSE
R801
VOLIN
VOLO
GND
BATT
POWER SW
VR UNIT
CONNECTOR UNIT
CHASSIS
EXP JACK
Vcc
J41
J851
EXTVCC
Q431: 2SB1132
Q432: XP6501
EDETEDT
PWR
CLONE
CTRL
EXTPTT
EXTMIC
IC421
TA7368F
AFOUT
GND PWR
AMP
INTSP
ISPMS
AF
MIC MUTE
Q441: 2SC4116
Q442: CPH3403 Q461:
Q443: CPH3403 UN911H
Q444:DTC144EU
IN/EXT
MIC SW
D451: MA8062
PTT
CONT Q462:
UN911H
PTT
IN/EXT
MIC SW
EPTTI
LOGIC UNIT
Q47: XP6501
V5V
RIPPLE
FIL
LVINV
Q1: 2SK1829 Q3: 2SK880
BUFF BUFF
Vcc
X1: CR-664A
DTCON
2 Vcc
15.3 MHz
LOOP
REF
FRCON FIL
Q221: IC1:
2SC4116 MB15A02PFV
PLL
✕ 2
IC
Q411:
2SC4213
AF
X231:
MUTE
CDBC450CX24
30.6 MHz
BPF
AFMS
DET
SQCON
D232:
DAN222
W/N
SW
IC251:
M62363FP-650C
MOCON
D/A
Vcc
D/A control BUS
AFVS
MODIN
CDTENC
CTIFS
IC261B: IC282: IC281A:
DE- NJM2904V TC4W53FU TC4W66FU
ENPHA
AF
ANALOG
LPF
MUTE
SW
IC261A:
NJM2904V
BEEPO BEEPO DETMS
LPF
IC281B: IC381:
TC4W66FU FX214LG
AF
SCRAMBLE
MUTE
SRXMS IC382B:
NJM2904V
AMP
IC471A: IC471B:
NJM2904V NJM2904V
MIC PRE- MIC
AMP ENPHA AMP
CONTROL LINE
COMMON LINE
RX LINE
TX LINE
10 -1
VCO
Q41: 2SC4226
Q61: 2SC4215 Q62: 2SC4215
D31-34:
HVC350B
BUFF
BUFF
VCOS
D39:
1SV245 Q71: 2SC4215
Q51:
2SC4226
VCO
FM
BUFF
MOD D35-38: SW
HVC350B
Q81: XP1214
Q82: DTC144EU
LPF
PLL DATA BUS
Q232: 2SC5107
Q231: DTA144EU
W/NS
W/N
W/NS
SW
NOISV
Q211:
RSSIV FI211: FL-353
2SC4215
Q191:
3SK299
FM IF IC
IF
BPF
IC231:
AMP
TA31136FN
31.05 MHz
D231: FI231:
DAN222 CFWM450E
W/N CERAMIC
SW BPF
Q291:
XP4601
FI232:
CFWM450G
CDECV
LPF
CERAMIC
BPF
IC311:
NJM2125F
WDETV
LPF
Q501:
DTC144EU
W/N
SW
IC491A:
NJM2904V
LIMIT
LPF
AMP
IC491B:
NJM2904V
Q531: XP1213
IC481B: LDTFS
FIL
TC4W66FU
SW
AF
AMP
MUTE
Q532:
2SC4116
IC382A:
NJM2904V
STXMS
LPF D/A
IC481A:
TC4W66FU
AF
MUTE
LPF
MICMS
D91: MA77 Q91: Q101: Q111:
D92: MA77 2SC5110 RD01MUS1 RD07MVS1
TX/RX PWR
PRE
BUFF
DRIVE
SW AMP
IC141:
TA75S01F
T1CON APC
ATT
CTRL
Q141:
DTA144EU
TXMS
MUTE
SW
D182: D181: Q165: D155: D154:
HVU350B HVU350B 3SK294 HVU350B HVU350B
RF
BPF BPF BPF BPF
AMP
T4CON T3CON T2CON
T1CON
IC331: EW-460
BTYPE
S5V
BTYPE
DET
Q322: 2SA1588
R5V
R5V
R5VS
REG
X601: D601:
Q323: 2SA1588 MA77
CR-747
T5V T5V SHIFT
REG T5VS SW
9.8304 MHz
Q321: 2SA1588
IC581: S-80942CNMC
V5V V5V
REG V5VS
RESET
Q561: 2SA1588
IC551:
NJM2870
S5V S5V
S5VS
REG CPU
5V
Vcc
Q551: 2SB1132
IC591: HN58X2416TI
Q552: XP6501
Q553: DTC144EU
CPU5V EEPROM
M5V
M5VS
M5V REG
SCRAMBLE CODE DATA BUS
CENC 1, 2, 3
ATIS
ANTENNA
146 –174 MHz
D132:
1SS375
TDETV
PWR
DET
D131: 1SV307
D151: 1SV307
D152: MA77
ANT
LPF
SW
MAIN UNIT
LOGIC UNIT
W/NS
BTYPE
LDTFS
TDETV
BEEP
WDECV
CDECV
ISPMS
AFVS
RSSIV
AFMS
NOISV
STXMS
LVINV
MICMS
TEMPV
BATTV
PTTIN
EPTTI
LCD
CSIFT
DS651, DS652:
FY1101F
DS653, DS654:
SML-311YT
CPU
BACK
LIGHT
IC661:
µPD780316GC
Q651: XP1213
DRIVER
KEY