Logic Unit - Icom IC-T81E Service Manual

Multiband fm transceiver
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SECTION 10
BLOCK DIAGRAM
MOD
BAND SW
50MHz
Q306: 2SJ364
Q307: UN9214
DEV
SW
BAND SW
144MHz
Q304: 2SJ364
BAMD SW
430MHz
Q305: 2SJ364
BAMD SW
1200MHz
Q309: 2SJ364
IC301:
IC301:
Q303: UN9214
BA4510F
BA4510F
MC1: EM-140
MUTE
MIC
MIC
LPF
SW
AMP
S2: JPM1990-2013R
VCC
SP1:
CS028014-12 (CHASSIS)
TX
SENS
Q302: 2SB1462
CTCOUT
BEEP
BUS
COMMON
RX
TX
COMPLETE VIEW

LOGIC UNIT

DC-DC
IC5: M62368GP
FSET
DATA, CK, DAST
TUNE
D/A
PSET
Q751: XP1501
Q752: 2SD2216
Q754: 2SD2216
+3C
REG
DC-DC
Q308: XP5601
D2: MA729
D3: MA2S111
IC3: XC6371A500PR
Q361: 2SJ364
AF
AFVOL
MUTE
Q143:UN9213
IC202: M5222FP
IC203: TA75S01F
Q142: XP1501
IC141:
Q145: 2SB1132
S-81332HG-KC
+3C
+3C
VCC
+3CPU
CTCIN
REG
REG
X1: CR-639
5.039MHz
Q1: UN9115
DS1: CL-200YG-C-TS
LED
IC142:
DRIVER
S-80928ALMP-DAR
LIGHT
RESET
Q3:
DS3:
LT1EPS3A
XP4315
LED
CPU
DRIVER
IC1
M38267M8LGP
CPUHV
DS4: LM-1728B
INITIAL
EEPROM
KEY
LCD
MATRIX
IC2:
X24320-2.5
IC4: TC4W53FU
THERM(RX)
THERM
THERM(TX)
SW
PLL, IODATA
D141: MA2S111
Q141: UN9210
CLONEOUT
SPREMOTE
CLONE
SW
CLONEIN
R3C
R3
REG
Q7: XP1501
Q8: 2SB1132
10 - 1
PSET
MOD
DC-DC
+5V
FSET
TUNE
FI701: PBFC450R15DR
BPF
450KHz
AM
D701: 1SS364
DET
MODE
MODE
D702: 1SS364
SW
SW
IC241: NJM2902V
IF
AF
IF IC
2nd LO
FILTER
IC701: TA31136FN
IC201:
TA7368F
AF
AMP
Q201: 2SB1201
Q202: XP1501
AF
REG
SENS
Q151: 2SD2216
D152: MA2S111
D151: MA8100
HV
HV
SENS
R+3
VCO BOARD
Q350: 2SC5006
D351: 1SV270
D352: MA2S077
BUFF
x2
HPF
LPF
BUFF
Q353: 2SC5195
Q354:
Q351: 2SC5195
2SC5195
Q321: 2SC5195
Q322: 2SC5195
D321: MA2S077
Q323: 2SC5195
D322: HVU350
BUFF
Q311: 2SC5195
Q312: 2SC5195
Q313: 2SC5195
D302: MA2S077
D312: 1SS364
D311: MA2SV05
BUFF
Q301: 2SC5195
Q302: 2SC5195
D301: 1SV282
Q807: 2SC5107
BUFF
Q342: 2SC4215
Q341: 2SC4215
TX: 50-54MHz
BUFF
Q343: 2SC4226
Q813: 2SC5107
SHIFT
SW
x2
HPF
LPF
BUFF
Q804: 2SK880
Q805: 2SC4117
IC801: UPD3140GS
LOOP
PLL
FIL
IC
LOOP
FIL
Q811: 2SK880
Q812: 2SC4117
X1: CR-638
13.8MHz
MODE
TUNE
LPF
TCXO
SW
CTRL
D721: 1SS364
Q825: UN921E
Q803:
Q826: UN911D
2SK880
Q827: UN921E
X5
Q828: UN911D
Q829: UN921E
Q721:
2SC4215
LEVEL
CONV
LOOP
PLL
BUFF
FIL
IC
IC802: TB31242FN
Q816: 2SC4228
EXT.SP
SPREMOTE
RF UNIT
D806: MA2S077
Q824: 2SC5195
D807: MA2S077
Q131: 2SC5195
Q132: 2SC5454
LO
TX/RX
BUFF
BUFF
AMP
SW
RX-Lo FREQUENCY:
TX-Lo FREQUENCY:
1200MHz BAND
1200MHz BAND
D804: MA2S077
Q823: 2SC5107
D805: MA2S077
Q135: 2SC5107
LO
TX/RX
BUFF
AMP
SW
RX-Lo FREQUENCY:
TX-Lo FREQUENCY:
430MHz BAND
430MHzBAND
D802: MA2S077
Q133: 2SC4403
Q822: 2SC5107
D803: MA2S077
LO
TX/RX
BUFF
AMP
SW
RX-Lo FREQUENCY:
TX-Lo FREQUENCY
50MHz/WFM/
50/144MHz BAND
144MHz BAND
Q821: 2SC4403
VGGC
LO
AMP
TX-Lo FREQUENCY:
50MHz BAND
IC901:
Q91
NJM3404AV
Q91
A
APC
PSET
RX-Lo FREQUENCY:
50MHz BAND
WFM BAND
144MHz BAND
430MHz BAND
1200MHz BAND
D602: 1SS364
FI601: FL-299
D601: 1SS364
MODE
XTAL
MODE
BPF
PDA1, PDA2, CK
SW
SW
PLST1, PLST2
69.45MHz
FI602: SFECV13.35MA
CERAMIC
BPF
13.35MHz
Q701: 2SC4215
IF
AMP
DATA, CK, IOSTRB
TXC
T4
T4
REG
Q901: UN9211
+3C
+3
+3
Q902: 2SD2216
REG
Q903: 2SB1132
D901: MA133
IC5: S-81332HG-KC
Q1: 2SD2216
Q2: XP1501
Q3: 2SB1132

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