Icom IC-M803 Service Manual page 65

MAIN UNIT(5/9) MAIN UNIT(6/9)
See See for the schematic.
for the schematic.
FP1R1V
FP2R5V
DA3R3V
ADSCLK/ADSDIO/ADCS
ADDA0~1/ADDB0~1/ADFC/ADDC
ADCLK
73.728MHz
IC5101
FPGA
IC5451
LVDS
DRIVE
DA3R3V
IC5461
CLK74M
BUFF
73.728MHz
DA3R3V
IC5461
BUFF
DA3R3V
IC5281
DACLK
73.728MHz
DAD00~13
3R3V
MAIN UNIT(6/9)
See for the schematic.
Q5481/Q5482
IC5491
REF24M 24.576MHz
AMP
DA3R3V DA3R3V
See
HRV
DRV
BPF
fc=39MHz
IC5241 D5221
PIN
AMP
ATT
3R3V
DAGCV
IC5201
ADC BPF
1R8V
fc=39MHz
MAIN UNIT(3/9)
See
IC5181 D5161
PIN
AMP
ATT
3R3V
HAGCV
MAIN UNIT(7/9)
See for the schematic.
Q5421/Q5422
IC5441
AMP
BUFF
DA3R3V DA3R3V
XOCV
X5421
73.728MHz
20ppm
fc=33MHz
DAC
LPF
DA3R3V
BUFF
See
MAIN UNIT(1/9)
X5481
24.576MHz for the schematic.
(0.28ppm)
MAIN UNIT(4/9)
for the schematic.
DPOFS
DPOF13
CTRL
Q4871/Q4872
Q4881
PRE
AMP
DPONS
DPON13
CTRL
DPR8
Q4882~Q4884
DRRF
for the schematic.
HRRF
HPOFS
HPOF13
CTRL
Q4631/Q4632
ATT
Q4641
HPONS
HPON13
CTRL
HPR8
Q4642~Q4644
D4664 D4663 IC4661 2.6dB
PIN PIN
HTRF RF
ATT
ATT ATT AMP
ALC
+5 Q4661
8V CTRL
REG
AMP
DRIV
IC4662
IC4072/Q4073
TXS CTRL CTRL
Q4663 Q4662
10-3
2MHz BAND fc=18MHz
BPF LPF
DB1S
4MHz BAND
BPF
DB2S
6MHz BAND
BPF
DB3S
8MHz BAND
BPF
DB4S
12MHz BAND
BPF
DB5S
16MHz BAND
BPF
DB6S
0.03~1.9999MHz fc=33MHz
LPF LPF
HB1S
2.00~2.9999MHz
BPF
HB2S
PRE 3.00~4.9999MHz
AMP
BPF
HB3S
5.00~6.9999MHz
BPF
ATT HB4S
7.00~9.9999MHz
BPF
HB5S
10.00~13.9999MHz
BPF
HB6S
D4662
14.00~17.9999MHz
PIN
ATT
BPF
HB7S
18.00~23.9999MHz
BPF
HB8S
24.00~29.9999MHz
BPF
HB9S
DSC ANT
Q4701/Q4702
D4703
REV-PWR
CTRL
DET
ATT
T8V
ATT
fc=1.6MHz Q4421
TO FILTER
HPF MUTE HRX
R8V
T8V
Q4426/Q4427
CTRL RXS
Q4422~Q4424
SLFS
T8V
CTRL
TXS
3dB IC4401 fc=33MHz 1.8dB
TO PA
YGR
ATT LPF ATT YGR
AMP
Q4401/Q4402
TXS CTRL
Explanatory notes
TX Line
RX Line