Voltage Block Diagram - Icom ID-880H Service Manual

4-5 VOLTAGE BLOCK DIAGRAM

Voltage from the power supply is routed to the whole of the transceiver via regulators and switches.
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 IC (IC14),
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.