Power Supply Circuits - Icom Ic-2820H Service Manual

4-4 POWER SUPPLY CIRCUITS

Voltage from the power supply is routed to whole of the circuit in the transceiver via switches and regulators.
MAIN UNIT
NOISE
FILTER
IC21
5V
REG
Q81
VCC
REG
Q82
PWR
PWR
CTRL
HV TX power
amplifiers (IC2, IC3)
IC55, D164
IDET
CURRENT CPU (IC25)
DETECT (for current monitoring)
CPU (IC25),
CPU5V
NOISE
EEPROM (IC22),
FIL
Reset IC (IC23), etc.
Q83,
D119
PLL ICs (IC14, IC41),
5VS
5VS
D/A converter (IC8),
REG
ALC IC (IC32), etc.
Q84, D120
DTMF decoder (IC56),
L5V
5VS
Electric volume (IC33),
REG
AF mixer (IC59), etc.
5V
Limitter (D165−D168), etc.
IC24
AF filter (Q47, Q50),
8V
+8
MIC amplifier (IC28),
REG
APC controller (IC4), etc.
VCC
AF power amplifier (IC38)
IC3
HV
+5
REG
4 - 8
CONTROL UNIT
+3
REG
CPU (IC13),
+3.2V
Regulator (Q14, Q15),
Protector/Buffer (IC12), etc.
Reset IC (IC9),
5V
LCD module, etc.