![background image](http://html2.mh-extra.com/html/icom/ic-7100/ic-7100_service-manual-addendum_3610552231.webp)
3-12
3-5 VOLTAGE DIAGRAM
Voltage from the power supply is routed throughout the
transceiver, through regulators and switches.
• EXPANDER (MAIN UNIT: IC7003)
• EXPANDER (MAIN UNIT: IC7004)
PIN
No.
LINE
NAME
DESCRIPTION
I/O
1
VTRS
VHF band 1st IF trap circuit switching.
High= While operating on 108.000000 to
143.999999 MHz.
O
3
HPR2S
HF/50 MHz/70 MHz band pre-AMP 2 control.
High=The Pre-AMP is ON.
O
4
HPR1S
HF/50 MHz/70 MHz band pre-AMP 1 control.
Low=The Pre-AMP is ON.
O
6
HATTS
HF/50 MHz/70 MHz band attenuator control.
Low=The attenuator is ON.
O
15
B8
HF/50 HMz/70 MHz band select.
High= While operating on 60.000000 to
74.799999 MHz.
O
PIN
No.
LINE
NAME
DESCRIPTION
I/O
1
RSPS
Rear speaker mute control.
Low=External speaker output (Rear) is mute.
O
4
ASQLS
Squelch signal to the [ACC] and [DATA] con-
nectors.
High=While the squelch is open.
O
7
UMODS Modulation signal select.
High= USB audio signal is selected.
O
15
AFONS
AF output mute control.
Low=The AF output is mute.
O
+1.3V
REG
DC-DC
DC-DC
DC-DC
+1.2V
REG
VR8V
HT8V
T8V
HR8V
R8V
UR8V
R8
CTRL
R8
CTRL
R8
CTRL
T8
CTRL
T8
CTRL
R8
CTRL
VT5V
T5V
UT5V
T5
CTRL
T5
CTRL
T5
CTRL
+8
REG
IC161
H3R3V
1R3V
IF DSP Core
DSP (for DV mode)
Common TX circuit.
Common TX circuit.
Common TX circuit.
HF band TX circuit.
Common RX circuit.
VHF band TX circuit.
UHF band TX circuit.
HF band RX circuit.
VHF band RX circuit.
UHF band RX circuit.
8V
5V
1R2V
3R3V
DSP
IC5061
+1.8V
REG
1st LO DDS,
1R8V
IC2204
IC5501
IC1001
Q1001 Q1002
IC1101
IC1201
Q1419 to Q1421
Q1416 to Q1418
Q1413 Q1414
Q1410 to Q1412
Q1451 to Q1453
Q1454 to Q1456
Q1404
Q1405
to Q1403
Q1408
Q1401
Q1407
MAIN UNIT
DISPLAY UNIT
F8V
REVERSE
CONNECT
PROTECT
Fuse
(EP1)
Drive AMP
DC13.8V
From the power supply
TX power AMP,
USB HUB, USB bridge,
microSD card driver
Current
detect
14V
HV
IC362
Q391
D371,D372,D373
DC-DC
IC701
F3R3V
Front CPU