Block Diagram - Icom IC-4008A Service Manual

SECTION 10

BLOCK DIAGRAM

RF UNIT
X2
IC2
CDBCA450CX24
TA31136FN
(450 kHz)
FI3: CFWM450E
CERAMIC
IF
BPF
AMP
(450 kHz)
FMDET S DET
DATA,CK,STB
NOISE
UNLOCK
DET
X1
CR-632
(21.25 MHz)
AF FIL
Q15: 2SC4081
Q16: 2SC4081
MAIN UNIT
AF
VOL
TXMOD
MMUT
EEP
ROM
IC3
X24C01AS
X1
CR-627
CPU
5.8368 MHz
IC1
PD753036GK
POWER
MODE
DS2 IC5
UP
VOLT
LCD RESET
SENS
DOWN
S-80928ANMP
S1
PTT
Q1 FI2
2nd MIX
IF 1st.IF: 21.7 MHz
XTAL
AMP
BPF
Q13: 2SC4081
FL-298
2SC4215 Q14: 2SA1586
VCO
D8 : 1SS355 REG
2nd.Lo: 21.25 MHz
D9 : 1SS355
Q6: 2SC5108
IC1
D4,D5: 1SV284
TB31202FN
VCO
PLL LOOP
BUFF
IC FIL
Q7
2SC5108
Q12
2SC5108
SHIFT
Q7
2SC4081
TONE
LPF
D/A
Q12
CTCIN 2SC4081 TONE
LPF
MICSW
PTT2
RMUT
REMIN
AFON
TXV
RXV
POWER
Q14
DTA114EU
LED
+3V
DRV
CURRENT
AMP
DS1
LN1371G Q25: UMZ2N
D4: 1SS355
10 - 1
Q2
2SC4226
1st MIX
1st.LO: 411.375-413.075MHz
LO PRE
ATT
SW DRIVE
D1: MA77
D2: MA77
R50
MOD LEVEL SET
MODSW
Q1
IC2A
DTA144EU
NJM2100M
LPF
+3V
R+3 T+3
Q18
CURRENT CURRENT
2SA1586
AMP AMP
IC6
S-81230SG
+3
REG
+3V TO LOGIC R+3 T+3
Q3: 2SC5194
FI1: NSVA468
RF
ANT
BPF
AMP
SW
D7: MA2S077
D101: MA2S077
D102: MA2S077
Q8
D103 Q201
2SC4228
TX: 433.075-434.775MHz
PWR
TX/RX DRIVE
SW AMP
AMP
Q202: MRF9745
MA2S728 2SC3356
POWER SET
R206
Q6
IC2B
2SK1829
NJM2100M
MIC
IDC
MUTE
PTT Q2: UN9215
SENSE Q3: UN5119
D2 1SS355
IC9
NJM2070M
PROTECTOR
AF
AMP
[CSA/-1]
Q5 : 2SA1362
Q27 : 2SC4081
Q10: 2SC4081
Q28 : 2SB798
Q11: 2SC4213
Q101: UMZ1N AF
D5: 1SS355 MUTE
D101: 1SS355
BATT
[ITA/-1]
Q27 : 2SC4081
Q28 : 2SB798
D5: MA2S111
D101: MA2S111
D303: MA2S111
CHASSIS UNT
ANT
TX/RX: 433.075-434.775MHz
HPF LPF
Q29: DTC114EU
MIC1
MIC
MIC KUC3523
SW
J1 MIC JACK
Q23
2SJ144
VOL
MUTE
R58
AF VOL
J3 SP JACK
SP1
BATTERY
CHASSIS UNIT
COMON LINE
TX LINE
RX LINE
DATA BUS LINE