Icom IC-T81E Service Manual page 45

SECTION 10 BLOCK DIAGRAM
LOGIC UNIT
MOD
BAND SW
50MHz DC-DC
Q306: 2SJ364
Q307: UN9214
DEV
SW
BAND SW
144MHz
Q304: 2SJ364
IC5: M62368GP FSET
DATA, CK, DAST
D/A TUNE
AM
PSET
DET
Q751: XP1501
Q752: 2SD2216
BAMD SW
430MHz Q754: 2SD2216
Q305: 2SJ364
IC241: NJM2902V
BAMD SW AF
1200MHz FILTER
+3C
REG DC-DC
Q309: 2SJ364
Q308: XP5601 D2: MA729
D3: MA2S111 IC3: XC6371A500PR
Q361: 2SJ364
IC301: IC301:
Q303: UN9214 BA4510F BA4510F
AF
MC1: EM-140 Q143:UN9213 MUTE AFVOL
MUTE MIC
MIC LPF
SW AMP IC202: M5222FP
IC203: TA75S01F
Q142: XP1501
IC141:
Q145: 2SB1132
S-81332HG-KC
S2: JPM1990-2013R +3C +3C
VCC
+3CPU REG CTCIN
VCC X1: CR-639
REG
5.039MHz
Q1: UN9115 DS1: CL-200YG-C-TS
IC142: LED
SP1: DRIVER
S-80928ALMP-DAR
CS028014-12 (CHASSIS)
LIGHT
RESET
Q3: DS3:
XP4315 LT1EPS3A
TX LED
SENS DRIVER
CPU
IC1
Q302: 2SB1462 CTCOUT
BEEP
M38267M8LGP
CPUHV
Q151: 2SD2216
D152: MA2S111
D151: MA8100
DS4: LM-1728B
INITIAL
LCD EEPROM KEY
MATRIX
IC2:
X24320-2.5
IC4: TC4W53FU
THERM(RX)
THERM
SW THERM(TX)
PLL, IODATA
D141: MA2S111
Q141: UN9210
CLONEOUT
CLONE SPREMOTE
SW
CLONEIN
BUS R3C R3
REG
COMMON
Q7: XP1501
Q8: 2SB1132
RX
TX
LEFT SIDE 10 - 1
PSET
MOD
VCO BOARD
Q350: 2SC5006
D351: 1SV270
D352: MA2S077
BUFF x2 HPF LPF BUFF
+5V
DC-DC
Q351: 2SC5195 Q353: 2SC5195 Q354:
2SC5195
FSET
Q321: 2SC5195
TUNE
Q322: 2SC5195
D321: MA2S077 Q323: 2SC5195
D322: HVU350
BUFF
FI701: PBFC450R15DR
BPF Q311: 2SC5195
Q312: 2SC5195
Q313: 2SC5195
450KHz D302: MA2S077 D312: 1SS364
D701: 1SS364 D311: MA2SV05
BUFF
MODE MODE D702: 1SS364
SW SW
Q301: 2SC5195
IF Q302: 2SC5195
IF IC 2nd LO D301: 1SV282
Q807: 2SC5107
IC701: TA31136FN
BUFF
Q342: 2SC4215
Q341: 2SC4215
IC201: TX: 50-54MHz
BUFF
TA7368F
AF
AMP
Q343: 2SC4226
Q201: 2SB1201 SHIFT Q813: 2SC5107
Q202: XP1501 SW
x2 HPF LPF BUFF
AF
REG
Q804: 2SK880
Q805: 2SC4117
IC801: UPD3140GS
LOOP PLL
FIL IC
LOOP
FIL
Q811: 2SK880
Q812: 2SC4117
SENS
X1: CR-638
MODE 13.8MHz
TUNE LPF TCXO
SW
CTRL
D721: 1SS364
HV HV Q803: Q825: UN921E
Q826: UN911D
SENS 2SK880
Q827: UN921E
X5
Q828: UN911D
Q829: UN921E
PDA1, PDA2, CK
Q721:
2SC4215 LEVEL PLST1, PLST2
CONV
LOOP PLL
BUFF
FIL IC
IC802: TB31242FN Q816: 2SC4228
EXT.SP
SPREMOTE
R+3
RF UNIT
D806: MA2S077 D51: MA2S077
Q131: 2SC5195 Q132: 2SC5454 Q138: MXR9745
Q824: 2SC5195 D807: MA2S077 D52: MA2S077
TX FREQUENCY: 1200MHz BAND ANT
LO TX/RX YGR LPF
AMP SW BUFF BUFF AMP HPF SW
RX-Lo FREQUENCY: TX-Lo FREQUENCY:
1200MHz BAND 1200MHz BAND
TX FREQUENCY:
D804: MA2S077 Q136: D402: MA2S077
D805: MA2S077 2SC3356 Q922: 2SK3075 430MHz BAND
Q823: 2SC5107 Q135: 2SC5107 D403: MA2S077
LO TX/RX ANT
BUFF YGR PWR HPF LPF HPF
AMP SW AMP AMP SW
RX-Lo FREQUENCY: TX-Lo FREQUENCY:
430MHz BAND 430MHzBAND
Q134: TX FREQUENCY:
D802: MA2S077 D302: MA2S077
Q822: 2SC5107 D803: MA2S077 Q133: 2SC4403 2SC3356 Q921: MRF9745 144MHz BAND D303: MA2S077
LO TX/RX YGR ANT
BUFF DRIVE LPF HPF HPF LPF
AMP SW AMP AMP SW
RX-Lo FREQUENCY: TX-Lo FREQUENCY:
50MHz/WFM/ 50/144MHz BAND
144MHz BAND
D101: 1SV308
Q821: 2SC4403 TX FREQUENCY: D102: 1SV308
50MHz BAND
LO VGGC ANT
LPF LPF
AMP SW
TX-Lo FREQUENCY:
50MHz BAND
FI52: FI51:
LFL30-13C1270B060 LFL30-13C1270B060
IC51: UPC2748T Q51: 2SC5319
RF RF
BPF AMP BPF AMP
RX FREQUENCY:
1200MHz BAND
IC901: Q912: UN9215 FI401:
IC501:
NJM3404AV Q913: XP6401 UPC2748T EFCH435MWNP1 Q401: 2SC5195
APC RF RF
APC AMP BPF AMP
SENS
RX FREQUENCY:
430MHz BAND
D309: MA2SV05
D310: MA2SV05 Q301: 3SK291
D306: MA2SV05
PSET BPF RF BPF
AMP
RX FREQUENCY:
RX-Lo FREQUENCY: 144MHz BAND
50MHz BAND
WFM BAND
144MHz BAND D202: MA2S304
430MHz BAND D203: MA2S304 Q201: 3SK292
1200MHz BAND RF
BPF BPF
AMP
RX FREQUENCY: WFM BAND
D106: HVU350
D602: 1SS364 FI601: FL-299 D601: 1SS364 Q101: 2SC5195
D107: HVU350
MODE XTAL MODE RF
BPF
SW BPF SW AMP
RX FREQUENCY: 50MHz BAND
IC601:
69.45MHz
UPC2757T
FI602: SFECV13.35MA
LEVEL
CERAMIC CONV Q9: XP4601
BPF
13.35MHz HV
TUNE
Q701: 2SC4215
IF
AMP IC2:
DATA, CK, IOSTRB Q5: UN9210
BU4094BCFV VCC
I/O
DC CHG CHGC
CHG
TXC SW CTRL
T4 T4
REG
DATA D4: MA2S728 Q4: 2SB1132
Q6: HAT1024R D5: MA133
+3C +3 +3 Q901: UN9211 D6: SB07-03C
Q902: 2SD2216 I/O TO BATT
REG
Q903: 2SB1132
IC5: S-81332HG-KC D901: MA133 IC3: BU4094BCFV
Q1: 2SD2216
Q2: XP1501
Q3: 2SB1132
TX/RX FREQUENCY
HPF
LPF
RIGHT SIDE