Voltage Diagrams - Icom IC-F8100 Service Manual

4-4 PORT ALLOCATIONS (Continued)
• MAIN CPU (MAIN UNIT: IC1806)
Pin Line
No. Name
Binar y to decimal conver ter control.
98 STBSEL_D
H=Enabled.
Binar y to decimal conver ter control.
99 STBSEL_C
H=Enabled.
Binar y to decimal conver ter control.
100 STBSEL_B
H=Enabled.

4-5 VOLTAGE DIAGRAMS

Voltage from the power supply is routed throughout the transponder via regulators and switches.
D4002
13.8V COMMON FUSE
(5A)
FILTER
Q4004
D4001
RELAY
CTRL
Description I/O
O
O
O
PA UNIT
IC1806
MAIN
CPU
IC1808
HV
RESET
IC1801
HV
+5
REG
HV
14V
IC8001
IC4001
Q8001,Q8002
+8
3.3V/-8V
PA8V
14V
REG
REG
IC8203
3.3V +1.2
REG
MAIN UNIT
IC1812
SRAM
Q1806,Q1807
D1810
BU CNTL
H5V
DSP-2 UNIT
IC1001
M8V
M8V
+3.3V
REG
IC8201
IC1002
3.3V
+5
REG
DSP
+1.2V
Q1803
TXS
T8
DSP-1 UNIT
CTRL
Q1804
RXS
R8
CTRL
4-6
DISPLAY UNIT
IC6006
Q6002,Q6003
IC6009
HV +8
HV
SW
REG
14V
IC6008
+5
REG
3.3V
IC6007
+3.3V
+3V
REG
5V
IC6011
8V
HVLED
14V
+10V
REG
T8V
(TX circuits)
R8V
(RX circuits)
+8V
+5V