Icom IC-F33GT Service Manual page 28

SECTION 10 BLOCK DIAGRAM
IC25:
TC7S66FU X2
IC24: CR-781
15.3 MHz
TA75S01F
SW
BAL
LOOP
BUFF TCXO
REF FIL
Q22: IC21:
2SC4116 LMX2352TM 272.0-440.7 MHz
PLL
X3 BPF
IC
IF IC
45.9 MHz
BPF
IC9:TA31136FN
X1
CERAMIC
BPF
FI2
SQIN CDBC450CX24 CFWM450F
CFWM450F
450 kHz
DET
LVA,T1,T2
MOD
D/A
DET
AMP
IC12:
M62364FP IC13:
TC4W53FU
MSK
LPF
FM/PM
IC6:
NJM12902
MOD
MSK
LPF
Modulator
CTCSS/DTCS
IC6:
NJM12902V
TONE
LPF
CTCSS/DTCS DEC
IC19:
IC19:
NJM12904S
NJM12904V
DET CDEC
LPF AMP
IC6:
NJM12902V
SENC0-3
LPF
IC6:
NJM12902V
TONC CENC0-2
LPF
Q40:
UNR9213J
DUSE
FIL
SW
10 - 1
S5V
Q18: XP1214
RX VCO Q19: UNR9213J
Q17:
2SC5006
VCO
RIPPLE
D11: D9, D500 SW
FIL
HVC376B
HVC376B
Q20: 2SC4116
D8: MA2S111 RLVA LV
ADJ
Q15:
2SC5006
LV
BUFF
D13:
Q21: HVC376B
2SK880
LV
BUFF
ADJ
TX VCO Q14:
2SC5006
Q16: 2SC5006
D10, D501:
HVC376B
X2
TLVA D12:
1SV239
FM
MOD
Q7:
2SC4215
IF
AMP
SDEC
LPF EXPANDER AMP
SCRM
HPF
BLER
LIMIT
AMP
AMP
IC14:
AK2346
MSK Pre
BPF COMPRESSOR
DE-Modulator EMPHA
X5
CR-765
OPTIONAL BOARD
3.6864 MHz
J5
AXN330C038
D6:
MA2S077
SHIFT CSFT
SW
X6
CR-774
12.288 MHz
CPU
IC22: HD64F2238BTF13
R5V
Q29: D16, D17: Q704:
2SC5006 MA2S077 2SC5006
TX/RX PRE
BUFF
SW DRIVE
RSSI
GATE
ATT
CTRL
182.35 MHz-220.35 MHz
Q4:
2SK1829
FI1: D14: D15:
FL-335 HVC350B HVC350B
Q6:
3SK299
46.35 MHz
XTAL
BPF BPF
BPF
Q5:
3SK293
MIXER
T2
G
Q502:
2SK3019
MUTE
F
C
T5C
R5C
Q26: 2SB1132
Q27: XP6501 Q25: Q24:
Q28: UNR9113J 2SA1577
2SA1577
S5C
S5
R5 R5V T5 T5V
REG
VCC REG REG
+5 +5V S5V
REG
IC17:
NJM2870
DS3:
FX–2721
DS1:
LNJ310M6URA
LCD
RES DS2:
RESET
LNJ310M6URA
IC8:
S-80942CNMC-G9C
IC20:
LC75834W
LCD
EEPROM
DRIVER
IC10:
24LC64T
PA UNIT
Q702: Q701: D701: 1SV307 D701:
RD01MUS1 RD07MVS1 D703: RB706F 1SV307
PWR ANT
DRIVE DET
AMP AMP PWR SW
IC2:
TA75S01F
APC
AMP
T2
D19: D24:
HVC375B HVC375B
RF FUSE UNIT
BPF BPF
AMP
VCC
T1
IC23:
NJM12904 IC15:
AF VOL
TA7368F
AF
LPF
AMP
R315
BEEP
TONE
Q42: 2SB1132
Q41: XP6501
PWR
CTRL
CLI CLO
IC23:
NJM12904
AMP
Q43:
UN9112J
PTT
DET
D
NOTES :
KEY MATRIX
136-174 MHz
ANT UNIT
LPF
Q501:
UNR9213J
MUTE
SW
TMUT
F1
1 2
EXT SPEAKER
SP
MC1
PTT
EXT MIC
Rotary Selector
Voltage line
Contorol line
Common line
TX line
RX line
DATA lime