Kenwood NX-3720HG Service Manual page 20

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F1
Q15,Q16,D13
5V Reg
IC25
5.4V DC/DC
[BAT_CNT]
from
Power management IC
(IC22)
F4
Q12, Q13
DC SW
[SBC]
F5
Q17, Q18
DC SW
1-20 (No.RA054<Rev.001>)
50B
IC13 31BU
3.1V AVR
54M
IC24
1.2V DC/DC
IC12
1.8V DC/DC
IC20
3.2V AVR
IC17
3.2V AVR
IC26
5V AVR
IC609
5V AVR
[SBC]
IC23
5V AVR
[SBC]
SB1
SB2
Q 20, Q 23
90C
IC1
9V AVR
[TXC]
Q 21, Q 22
[ANTSW]
Fig.4 Power Supply Circuit
IC15 12BU
1.2V AVR
BackUp
Battery
12M
18M
IC21 18M_3
DC SW
32A
32M
18M
32A
32M
50A
32M
50AC
200C
50C IC14
20V DC/DC
32C
IC19
3.2V AVR
[SBC]
54M
90T
DC SW
90ANT
DC SW
50CT
Q206
IC16
DC SW
5V AVR
[ASSW]
RF Power Module
Power management IC
MPU/DSP RTC
MPU/DSP Core
MPU/DSP PLL
MPU/DSP I/O(B),DDR
Mobile DDR2,Sub unit
Flash ROMV(I/O) & 3state(512M)
CODEC DVDD
MPU/DSP I/O(A,C) DVDD, USB_VDDA33
Flash ROM, I/O Expander,ADC, CODEC
19.2M TCXO circuit, Uart SW, RS232C
driver, SP GND switch clock, Sub unit
8bit/8ch DAC
12bit/4ch DAC
CODEC AVDD,DRVDD
I/O Expander, D-sub level shift.
8bit/16ch ADC AVCC
OPamp for VREF/25REF
MPU/DSP USB_VBUS
SP GND switch driver
Sub unit
D-sub 15
VCO Assist
Direct Conversion Transceiver
Power management
Sub unit
Module unit
Sub unit
Audio Power Amp
D-sub 15
TX circuit
Antenna switch
TX PreDrive(MMIC)
RF Detector / Controller