Voltage Block Diagram - Icom IC-A14 Service Manual

• CPU (IC26) (continued)
LINE NAME
MMUTE MIC mute SW (Q51) control signal.
SEG1–
LCD (DS1) segments.
SEG34
COM1–
LCD (DS1) common terminal.
COM4
• DAC (IC17)
LINE NAME DESCRIPTION
T1
T2
BPF tuning volatages.
T3
T4
MODMAX Maximum deviation adjust voltage.
MOD30 30% deviation adjust voltage.
VOL RX audio level adjust avoltage.
REFV Reference frequency adjustment voltage.

4-5 VOLTAGE BLOCK DIAGRAM

Voltage from the attached battery pack is routed to the whole of the transceiver via regulators and switches.
VIN
CPU3.6V
Q70, 71
PCON
Q20, 90
R5C
Q25, 26
EXTREG
CPU
(IC26)
Q75, 76
LIGHTC
TXC
AFC
DESCRIPTION
IC22
VCC
CPU3.6V
Regulator
Logic 3.6V: EEPROM (IC25), Reset IC (IC24),etc.
+5V
Regulator
Common 5V: PLL IC (IC29), Reference oscillator (X5), Noise AMP (IC28), etc
Q57
R5S VCO
SW
SW
RX 5V: IF IC (IC1), RF AMP (Q11), 1st IF AMP (O13), etc.
EXT
Regulator
External 5V: Connected microphone.
Backlight
driver
Q7, 8
TXV
Regulator
TX 5V: Pre-driver (PA: Q4), APC AMP (PA: IC27), etc.
AF PWR AMP
Controller
IN/
STATUS
OUT
OUT Low
OUT –
OUT –
Battery pack
TX VCO (Q59, D45, 46)
RX VCO (Q58, D38, 48)
4 - 6
CONDITION
While TX AF line is mute.
–
–