Voltage Diagram - Icom IC-RX7 Service Manual Addendum

4-5 VOLTAGE DIAGRAM

Voltage from the power supply is routed to the whole of the receiver via the regulators and switches.
LOGIC UNIT
Padding voltage to the loop filter (1stV), Tuned BPFs (M: D53, 58)
Tone controller (L: IC19), Reference frequency oscillator (M: X1), PLL IC (1stV: IC3), PLL IC (2ndV: IC1), etc.
I C11:TC7W04FU
Q24:2SC4738
D24-D27:1SS372
+10V
VP +3V
DC-DC
REG
CPU (L: IC7), EEPROM (L: IC14, 15), RESET IC (L: IC6), etc.
Main power line; RF circuits,1st and 2nd IF circuits, AF circuits,etc.
AF power AMP (L: IC9)
LCD backlight (L: DS10–12)
4 - 4
IC3:NJU7775F3
Q2:2SA1588
VCC
CPU3V
+3V CPU3V
REG CONTROL
REG
Q27:HAT1023R
D2:SB07-03C
D35:MA2S728
D401:RR264M
IC18:BQ24064
Q26:UNR9213J
IC4:NJU7775F3 2
VCC
R3V R3V
REG
Q11:2SB1201
Q12:XP1501
AFVCC AF VCC
REG
Q43:2SA1577
Q44:2SC4738
D54:MA2S111
D55:MA2S728
1stVCO
VCO3V
VCC
1stVCO UNIT
3VREG
VCC
MAIN UNIT
J5
1 1
2 2
[DC 6V]
CHARGE
+
BATTERY
-