Icom IC-7100 Service Manual Addendum page 231

• EXPANDER (MAIN UNIT: IC7003)
PIN LINE
No. NAME
1 VTRS VHF band 1st IF trap circuit switching.
High= While operating on 108.000000 to
143.999999 MHz.
3 HPR2S HF/50 MHz/70 MHz band pre-AMP 2 control.
High=The Pre-AMP is ON.
4 HPR1S HF/50 MHz/70 MHz band pre-AMP 1 control.
Low=The Pre-AMP is ON.
6 HATTS HF/50 MHz/70 MHz band attenuator control.
Low=The attenuator is ON.
15 B8 HF/50 HMz/70 MHz band select.
High= While operating on 60.000000 to
74.799999 MHz.
• EXPANDER (MAIN UNIT: IC7004)
PIN LINE
No. NAME
1 RSPS Rear speaker mute control.
Low=External speaker output (Rear) is mute.
4 ASQLS Squelch signal to the [ACC] and [DATA] con-
nectors.
High=While the squelch is open.
7 UMODS Modulation signal select.
High= USB audio signal is selected.
15 AFONS AF output mute control.
Low=The AF output is mute.
DESCRIPTION
DESCRIPTION
3-5 VOLTAGE DIAGRAM
Voltage from the power supply is routed throughout the
I/O
transceiver, through regulators and switches.
O IC362
From the power supply
DC13.8V
REVERSE
CONNECT
O
Fuse
PROTECT
(EP1)
D371,D372,D373
IC1001
O
HV
O
O
I/O
O
Q391
O
O
O
MAIN UNIT
3-12
Current
detect
H3R3V
DC-DC
Q1001 Q1002
3R3V
IC5061
+1.2V 1R2V
REG
IC2204
+1.8V 1R8V
REG
IC5501
+1.3V 1R3V
REG
IC1101 Q1401 to Q1403
14V
5V T5
DC-DC
CTRL
Q1404 Q1405
T5
CTRL
Q1408
Q1407
T5
CTRL
IC1201 Q1410 to Q1412
8V
R8
DC-DC
CTRL
Q1451 to Q1453
R8
CTRL
Q1454 to Q1456
R8
CTRL
Q1419 to Q1421
R8
CTRL
Q1416 to Q1418
T8
CTRL
Q1413 Q1414
T8
CTRL
IC701
IC161
+8 F3R3V
F8V
DC-DC
REG
DISPLAY UNIT
TX power AMP,
Drive AMP
USB HUB, USB bridge,
microSD card driver
DSP
IF DSP Core
1st LO DDS,
DSP (for DV mode)
T5V
Common TX circuit.
VT5V
VHF band TX circuit.
UT5V
UHF band TX circuit.
HR8V
HF band RX circuit.
VR8V
VHF band RX circuit.
UR8V
UHF band RX circuit.
R8V
Common RX circuit.
Common TX circuit.
T8V
Common TX circuit.
HT8V
HF band TX circuit.
Front CPU