Kenwood TH-D74E Service Manual page 16

2.2 COMPONENTS DESCRIPTION
2.2.1 TX-RX UNIT (XC1-138E-01)
Ref. No. Use / Function Operation/Condition/Compatibility
IC1 RF AMP
IC3 APC
IC281 IF(A-band)
IC283 1st Mixer
IC284 IF(B-band)
IC285 3rd Mixer
IC286 IF AMP
IC287 Buffer(A-band)
IC288 Buffer(B-band)
IC361 Divider
IC363 5C AVR
IC364 PLL
IC365 6.6V DCDC
IC576 33BU AVR
IC577 33BV AVR
IC578 33CB AVR
IC579 33RA AVR
IC580 33C AVR
IC581 33CA AVR
IC582 33S AVR
IC583 33RB AVR
IC584 40C DCDC
IC585 Battery Charger
IC586 31BU AVR
IC587 AND SW
IC588 Pulse Generator Power ON Logic for DC IN
IC589 47C AVR
IC590 33IF AVR
IC591 AMP
IC592 OR Circuit
IC593 33RAD AVR
IC661 Sub MPU
IC662 AND SW
IC663 AND SW
IC671 DA Converter
IC672 Inverter
IC673 AND SW
IC674 FM tuner
IC675~677 Gate SW
IC700 33SD AVR
1-16 (No.RA044<Rev.001>)
TX AMP
AMP
A-band
B-band
B-band
B-band
B-band
OP AMP
OP AMP
Local B-band
5.3V regulator
A-band
Charge pump
3.3V regulator
3.3V regulator
3.3V regulator
3.3V regulator
3.3V regulator
3.3V regulator
3.3V regulator
3.3V regulator
4.0V DC/DC
8.4V DC/DC Driver IC with
Battery Charger
3.1V AVR
Power ON Logic for DC IN
or Battery Insert
or Battery Insert
4.7V AVR
3.3V AVR
Power ON Logic for DC IN
or Battery Insert
Power ON Logic for DC IN
or Battery Insert
3.3V AVR
Sub CPU
A-band PLL IC Control Signal
B-band PLL IC/FM IC Control
Signal
Signal level adjust
Oscillation circuit for FM tuner IC
BCLK, WCLK on/off
FM radio
SDO0, SCK0, /EVCS on/off
3.3V AVR
Ref. No. Use / Function Operation/Condition/Compatibility
IC701 LPDDR
IC702 Main MPU
IC703 Reset
IC704 /BINT
IC705 FLASH
IC707 CODEC
IC708 CODEC AVR
IC709 LED driver
IC710 AND SW
IC711 Inverter
IC712 33M AVR
IC713 30M AVR
IC714 33AD AVR
IC715 Level shift
IC717 31BU AVR
IC718 18M DCDC
IC719 AND SW
IC720 MOD AMP
IC721 ADC VREF
IC722 12M DCDC
IC723 12BU AVR
IC724 Load SW
IC725 ADC
IC726,732 Bus SW
IC728 AND SW
IC730 I/O Expander
IC731 LAMP B
IC733 SW
IC880 AF AMP
IC881 MIC AMP
IC882 AF AMP AVR
IC930 Level shift
IC931 18BT AVR
IC932 33BT AVR
IC933 30GPS AVR
IC935 BT and GPS
IC936,937 Level shift
Q2 RF AMP
Q4 SW
Q5 SW
Q6 RF AMP
Q7 SW
Q8 DC SW
Q9,10 DC SW
Q11 DC SW
Program for operation
CPU with DSP
3.5V detect
5.0V detect
Store the program and user data
coder/decoder for IF and AF
1.8V for CODEC
LCD backlight driver
LCD backlight control
Oscillation circuit for CODEC
3.3V regulator
3.0V regulator
3.3V regulator
Level shift 1.8V -> 3.1V
3.1V regulator
1.8V DC/DC
VINOK on/off
OP AMP
2.1V ref for ADC
1.2V DC/DC
1.2V regulator
18M on/off
Signal level converter
Analog signal on/off
PWR on/off
Key scan and LCD backlight
control
Variable regulator (6.8V)
Pull up switch
SP output
OP AMP
Variable regulator (6.8V)
Level shift 1.8V <=> 3.3V
1.8V regulator
3.3V regulator
3.0V regulator
Bluetooth and GPS control
Level shift 1.8V <=> 3.3V
TX final AMP(VHF/UHF)
VHF TX
Band SW(VHF,UHF)
TX drive AMP
APC slope change SW
TX on/off
47C on/off
UHF TX