Kenwood NX-3720HG Service Manual page 23

2.5 COMPONENTS DESCRIPTION
2.5.1 TX-RX unit (XC1-182K-00,XC1-183K-XX)
Ref. No. Part Name
IC1 IC
IC12 IC
IC13 IC
IC14 IC
IC15 IC
IC16 IC
IC17 IC
IC18 IC
IC19 IC
IC20 IC
IC21 IC
IC22 IC
IC23 IC
IC24 IC
IC25 IC
IC26 IC
IC101 IC
IC202 IC
IC203 IC
IC205 IC
IC301 IC
IC302 IC
IC401 IC
IC402 IC
IC403 IC
IC404 IC
IC405,406 IC
IC407,408 IC
IC409 IC
IC410 IC
IC411,412 IC
IC413 IC
IC414 IC
IC602,603 IC
IC604 IC
IC605 IC
IC606 IC
IC607 IC
IC608 IC
IC609 IC
Q11 Transistor
Q12 FET
Q13,14 Transistor
Q15,16 Transistor
Use / Function
Voltage regulator (90C)
DC/DC converter (18M)
Voltage regulator (31BU)
DC/DC converter (200C)
Voltage regulator (12BU)
Voltage regulator (50CT)
Voltage regulator (32A)
Ignition
Voltage regulator (32C)
Voltage regulator (32M)
Load Switch (18M_3 )
Power management
Voltage regulator (50C)
DC/DC converter (12M)
DC/DC converter (54M)
Voltage regulator (50A)
DC amplifier (CV/Assist)
MMIC (Pre-drive)
DC amplifier (APC)
RF power control
Attenuation
Transceiver IC
Flash memory
SDRAM
Logic control
MPU/DSP
Analog switch
Logic control
I/O expander
A/D converter
D/A converter
Ignition
DC amplifier (VREF/25VREF)
Logic control
I/O expander
RS232C Driver
Logic control
Codec
Audio amplifier
Voltage regulator (50AC)
DC switch (OVRB)
DC switch (SB1)
DC switch
Voltage regulator (50BU)
Ref. No. Part Name
Q17 FET
Q18 Transistor
Q19 FET
Q20 FET
Q21 Transistor
Q22 FET
Q23 Transistor
Q25 Transistor
Q101 Transistor
Q102 Transistor
Q103 FET
Q104 Transistor
Q105 FET
Q106,107 Transistor
Q201 FET
Q202 Transistor
Q204-206 Transistor
Q301 FET
Q401 Transistor
Q402-404 FET
Q601 FET
Q602 Transistor
Q603 FET
Q604 Transistor
Q605 FET
Q606 FET
D1 Zener diode
D13 Zener diode
D14,15 Diode
D16,17 Diode
D18,19 Diode
D20 Zener diode
D21 Diode
D22 Zener diode
D24 Diode
D26,27 Diode
D101 Zener diode
D102 Variable
capacitance diode
D103-106 Variable
capacitance diode
D107 Zener diode
D108 Variable
capacitance diode
D201 Zener diode
D202 Diode
D204 Diode
Use / Function
DC switch (SB2)
DC switch
DC switch
DC switch (90T)
DC switch
DC switch (90ANT)
DC switch
DC switch (SBC)
Tripler
Tripler
DC switch
Ripple filter
VCO oscillation
VCO Buffer amplifier
TX Drive amplifier
DC switch
DC switch
DC switch
TCXO Buffer amplifier
DC switch
Level conversion
DC switch
Horn alert switch
Audio mute
Audio mute
DC switch
Reverse protection
Voltage regulator (50BU)
Reverse current prevention
DC/DC converter
Reverse current prevention
Over voltage protection
Reverse current prevention
Over voltage protection
Backup battery charge
Reverse current prevention
Over voltage protection
VCO frequency control
VCO assist tune
Speed up
TX modulation
Over voltage protection
RF switch
TX Reverse power detection
(No.RA054<Rev.001>)1-23